diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index 585ac1074..8796f8845 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -50,8 +50,6 @@ jobs:
         exclude:
           - os: centos
             build: agent2
-          - os: ubuntu
-            build: agent2
 
     runs-on: ubuntu-20.04
     steps:
diff --git a/agent/alpine/docker-entrypoint.sh b/agent/alpine/docker-entrypoint.sh
index 9c8fc5791..4306b3d9a 100755
--- a/agent/alpine/docker-entrypoint.sh
+++ b/agent/alpine/docker-entrypoint.sh
@@ -5,7 +5,7 @@ set -o pipefail
 set +e
 
 # Script trace mode
-if [ "${DEBUG_MODE}" == "true" ]; then
+if [ "${DEBUG_MODE,,}" == "true" ]; then
     set -o xtrace
 fi
 
@@ -136,7 +136,7 @@ prepare_zbx_agent_config() {
     update_config_var $ZBX_AGENT_CONFIG "LogRemoteCommands" "${ZBX_LOGREMOTECOMMANDS}"
 
     : ${ZBX_PASSIVE_ALLOW:="true"}
-    if [ "$ZBX_PASSIVE_ALLOW" == "true" ]; then
+    if [ "${ZBX_PASSIVE_ALLOW,,}" == "true" ]; then
         echo "** Using '$ZBX_PASSIVESERVERS' servers for passive checks"
         update_config_var $ZBX_AGENT_CONFIG "Server" "${ZBX_PASSIVESERVERS}"
     else
@@ -148,7 +148,7 @@ prepare_zbx_agent_config() {
     update_config_var $ZBX_AGENT_CONFIG "StartAgents" "${ZBX_STARTAGENTS}"
 
     : ${ZBX_ACTIVE_ALLOW:="true"}
-    if [ "$ZBX_ACTIVE_ALLOW" == "true" ]; then
+    if [ "${ZBX_ACTIVE_ALLOW,,}" == "true" ]; then
         echo "** Using '$ZBX_ACTIVESERVERS' servers for active checks"
         update_config_var $ZBX_AGENT_CONFIG "ServerActive" "${ZBX_ACTIVESERVERS}"
     else
diff --git a/agent/centos/docker-entrypoint.sh b/agent/centos/docker-entrypoint.sh
index 9c8fc5791..4306b3d9a 100755
--- a/agent/centos/docker-entrypoint.sh
+++ b/agent/centos/docker-entrypoint.sh
@@ -5,7 +5,7 @@ set -o pipefail
 set +e
 
 # Script trace mode
-if [ "${DEBUG_MODE}" == "true" ]; then
+if [ "${DEBUG_MODE,,}" == "true" ]; then
     set -o xtrace
 fi
 
@@ -136,7 +136,7 @@ prepare_zbx_agent_config() {
     update_config_var $ZBX_AGENT_CONFIG "LogRemoteCommands" "${ZBX_LOGREMOTECOMMANDS}"
 
     : ${ZBX_PASSIVE_ALLOW:="true"}
-    if [ "$ZBX_PASSIVE_ALLOW" == "true" ]; then
+    if [ "${ZBX_PASSIVE_ALLOW,,}" == "true" ]; then
         echo "** Using '$ZBX_PASSIVESERVERS' servers for passive checks"
         update_config_var $ZBX_AGENT_CONFIG "Server" "${ZBX_PASSIVESERVERS}"
     else
@@ -148,7 +148,7 @@ prepare_zbx_agent_config() {
     update_config_var $ZBX_AGENT_CONFIG "StartAgents" "${ZBX_STARTAGENTS}"
 
     : ${ZBX_ACTIVE_ALLOW:="true"}
-    if [ "$ZBX_ACTIVE_ALLOW" == "true" ]; then
+    if [ "${ZBX_ACTIVE_ALLOW,,}" == "true" ]; then
         echo "** Using '$ZBX_ACTIVESERVERS' servers for active checks"
         update_config_var $ZBX_AGENT_CONFIG "ServerActive" "${ZBX_ACTIVESERVERS}"
     else
diff --git a/agent/ubuntu/docker-entrypoint.sh b/agent/ubuntu/docker-entrypoint.sh
index 9c8fc5791..4306b3d9a 100755
--- a/agent/ubuntu/docker-entrypoint.sh
+++ b/agent/ubuntu/docker-entrypoint.sh
@@ -5,7 +5,7 @@ set -o pipefail
 set +e
 
 # Script trace mode
-if [ "${DEBUG_MODE}" == "true" ]; then
+if [ "${DEBUG_MODE,,}" == "true" ]; then
     set -o xtrace
 fi
 
@@ -136,7 +136,7 @@ prepare_zbx_agent_config() {
     update_config_var $ZBX_AGENT_CONFIG "LogRemoteCommands" "${ZBX_LOGREMOTECOMMANDS}"
 
     : ${ZBX_PASSIVE_ALLOW:="true"}
-    if [ "$ZBX_PASSIVE_ALLOW" == "true" ]; then
+    if [ "${ZBX_PASSIVE_ALLOW,,}" == "true" ]; then
         echo "** Using '$ZBX_PASSIVESERVERS' servers for passive checks"
         update_config_var $ZBX_AGENT_CONFIG "Server" "${ZBX_PASSIVESERVERS}"
     else
@@ -148,7 +148,7 @@ prepare_zbx_agent_config() {
     update_config_var $ZBX_AGENT_CONFIG "StartAgents" "${ZBX_STARTAGENTS}"
 
     : ${ZBX_ACTIVE_ALLOW:="true"}
-    if [ "$ZBX_ACTIVE_ALLOW" == "true" ]; then
+    if [ "${ZBX_ACTIVE_ALLOW,,}" == "true" ]; then
         echo "** Using '$ZBX_ACTIVESERVERS' servers for active checks"
         update_config_var $ZBX_AGENT_CONFIG "ServerActive" "${ZBX_ACTIVESERVERS}"
     else
diff --git a/agent2/alpine/docker-entrypoint.sh b/agent2/alpine/docker-entrypoint.sh
index 5cad1e570..1476e10a4 100755
--- a/agent2/alpine/docker-entrypoint.sh
+++ b/agent2/alpine/docker-entrypoint.sh
@@ -5,7 +5,7 @@ set -o pipefail
 set +e
 
 # Script trace mode
-if [ "${DEBUG_MODE}" == "true" ]; then
+if [ "${DEBUG_MODE,,}" == "true" ]; then
     set -o xtrace
 fi
 
@@ -136,7 +136,7 @@ prepare_zbx_agent_config() {
     update_config_var $ZBX_AGENT_CONFIG "LogRemoteCommands" "${ZBX_LOGREMOTECOMMANDS}"
 
     : ${ZBX_PASSIVE_ALLOW:="true"}
-    if [ "$ZBX_PASSIVE_ALLOW" == "true" ]; then
+    if [ "${ZBX_PASSIVE_ALLOW,,}" == "true" ]; then
         echo "** Using '$ZBX_PASSIVESERVERS' servers for passive checks"
         update_config_var $ZBX_AGENT_CONFIG "Server" "${ZBX_PASSIVESERVERS}"
     else
@@ -147,14 +147,14 @@ prepare_zbx_agent_config() {
     update_config_var $ZBX_AGENT_CONFIG "ListenIP" "${ZBX_LISTENIP}"
 
     : ${ZBX_ACTIVE_ALLOW:="true"}
-    if [ "$ZBX_ACTIVE_ALLOW" == "true" ]; then
+    if [ "${ZBX_ACTIVE_ALLOW,,}" == "true" ]; then
         echo "** Using '$ZBX_ACTIVESERVERS' servers for active checks"
         update_config_var $ZBX_AGENT_CONFIG "ServerActive" "${ZBX_ACTIVESERVERS}"
     else
         update_config_var $ZBX_AGENT_CONFIG "ServerActive"
     fi
 
-    if [ "$ZBX_ENABLESTATUSPORT" == "true" ]; then
+    if [ "${ZBX_ENABLEPERSISTENTBUFFER,,}" == "true" ]; then
         update_config_var $ZBX_AGENT_CONFIG "EnablePersistentBuffer" "1"
         update_config_var $ZBX_AGENT_CONFIG "PersistentBufferFile" "$ZABBIX_USER_HOME_DIR/buffer/"
         update_config_var $ZBX_AGENT_CONFIG "PersistentBufferPeriod" "${ZBX_PERSISTENTBUFFERPERIOD}"
@@ -162,7 +162,7 @@ prepare_zbx_agent_config() {
         update_config_var $ZBX_AGENT_CONFIG "EnablePersistentBuffer" "0"
     fi
 
-    if [ "$ZBX_ENABLESTATUSPORT" == "true" ]; then
+    if [ "${ZBX_ENABLESTATUSPORT,,}" == "true" ]; then
         update_config_var $ZBX_AGENT_CONFIG "StatusPort" "31999"
     fi
 
diff --git a/agent2/ubuntu/docker-entrypoint.sh b/agent2/ubuntu/docker-entrypoint.sh
index 5cad1e570..1476e10a4 100755
--- a/agent2/ubuntu/docker-entrypoint.sh
+++ b/agent2/ubuntu/docker-entrypoint.sh
@@ -5,7 +5,7 @@ set -o pipefail
 set +e
 
 # Script trace mode
-if [ "${DEBUG_MODE}" == "true" ]; then
+if [ "${DEBUG_MODE,,}" == "true" ]; then
     set -o xtrace
 fi
 
@@ -136,7 +136,7 @@ prepare_zbx_agent_config() {
     update_config_var $ZBX_AGENT_CONFIG "LogRemoteCommands" "${ZBX_LOGREMOTECOMMANDS}"
 
     : ${ZBX_PASSIVE_ALLOW:="true"}
-    if [ "$ZBX_PASSIVE_ALLOW" == "true" ]; then
+    if [ "${ZBX_PASSIVE_ALLOW,,}" == "true" ]; then
         echo "** Using '$ZBX_PASSIVESERVERS' servers for passive checks"
         update_config_var $ZBX_AGENT_CONFIG "Server" "${ZBX_PASSIVESERVERS}"
     else
@@ -147,14 +147,14 @@ prepare_zbx_agent_config() {
     update_config_var $ZBX_AGENT_CONFIG "ListenIP" "${ZBX_LISTENIP}"
 
     : ${ZBX_ACTIVE_ALLOW:="true"}
-    if [ "$ZBX_ACTIVE_ALLOW" == "true" ]; then
+    if [ "${ZBX_ACTIVE_ALLOW,,}" == "true" ]; then
         echo "** Using '$ZBX_ACTIVESERVERS' servers for active checks"
         update_config_var $ZBX_AGENT_CONFIG "ServerActive" "${ZBX_ACTIVESERVERS}"
     else
         update_config_var $ZBX_AGENT_CONFIG "ServerActive"
     fi
 
-    if [ "$ZBX_ENABLESTATUSPORT" == "true" ]; then
+    if [ "${ZBX_ENABLEPERSISTENTBUFFER,,}" == "true" ]; then
         update_config_var $ZBX_AGENT_CONFIG "EnablePersistentBuffer" "1"
         update_config_var $ZBX_AGENT_CONFIG "PersistentBufferFile" "$ZABBIX_USER_HOME_DIR/buffer/"
         update_config_var $ZBX_AGENT_CONFIG "PersistentBufferPeriod" "${ZBX_PERSISTENTBUFFERPERIOD}"
@@ -162,7 +162,7 @@ prepare_zbx_agent_config() {
         update_config_var $ZBX_AGENT_CONFIG "EnablePersistentBuffer" "0"
     fi
 
-    if [ "$ZBX_ENABLESTATUSPORT" == "true" ]; then
+    if [ "${ZBX_ENABLESTATUSPORT,,}" == "true" ]; then
         update_config_var $ZBX_AGENT_CONFIG "StatusPort" "31999"
     fi
 
diff --git a/java-gateway/alpine/docker-entrypoint.sh b/java-gateway/alpine/docker-entrypoint.sh
index ec5223733..01ac14cd1 100755
--- a/java-gateway/alpine/docker-entrypoint.sh
+++ b/java-gateway/alpine/docker-entrypoint.sh
@@ -5,7 +5,7 @@ set -o pipefail
 set +e
 
 # Script trace mode
-if [ "${DEBUG_MODE}" == "true" ]; then
+if [ "${DEBUG_MODE,,}" == "true" ]; then
     set -o xtrace
 fi
 
diff --git a/java-gateway/centos/docker-entrypoint.sh b/java-gateway/centos/docker-entrypoint.sh
index ec5223733..01ac14cd1 100755
--- a/java-gateway/centos/docker-entrypoint.sh
+++ b/java-gateway/centos/docker-entrypoint.sh
@@ -5,7 +5,7 @@ set -o pipefail
 set +e
 
 # Script trace mode
-if [ "${DEBUG_MODE}" == "true" ]; then
+if [ "${DEBUG_MODE,,}" == "true" ]; then
     set -o xtrace
 fi
 
diff --git a/java-gateway/ubuntu/docker-entrypoint.sh b/java-gateway/ubuntu/docker-entrypoint.sh
index ec5223733..01ac14cd1 100755
--- a/java-gateway/ubuntu/docker-entrypoint.sh
+++ b/java-gateway/ubuntu/docker-entrypoint.sh
@@ -5,7 +5,7 @@ set -o pipefail
 set +e
 
 # Script trace mode
-if [ "${DEBUG_MODE}" == "true" ]; then
+if [ "${DEBUG_MODE,,}" == "true" ]; then
     set -o xtrace
 fi
 
diff --git a/proxy-mysql/alpine/docker-entrypoint.sh b/proxy-mysql/alpine/docker-entrypoint.sh
index ae6d185c8..548b52ccb 100755
--- a/proxy-mysql/alpine/docker-entrypoint.sh
+++ b/proxy-mysql/alpine/docker-entrypoint.sh
@@ -5,7 +5,7 @@ set -o pipefail
 set +e
 
 # Script trace mode
-if [ "${DEBUG_MODE}" == "true" ]; then
+if [ "${DEBUG_MODE,,}" == "true" ]; then
     set -o xtrace
 fi
 
@@ -150,17 +150,17 @@ check_variables_mysql() {
 
     file_env MYSQL_ROOT_PASSWORD
 
-    if [ ! -n "${MYSQL_USER}" ] && [ "${MYSQL_RANDOM_ROOT_PASSWORD}" == "true" ]; then
+    if [ ! -n "${MYSQL_USER}" ] && [ "${MYSQL_RANDOM_ROOT_PASSWORD,,}" == "true" ]; then
         echo "**** Impossible to use MySQL server because of unknown Zabbix user and random 'root' password"
         exit 1
     fi
 
-    if [ ! -n "${MYSQL_USER}" ] && [ ! -n "${MYSQL_ROOT_PASSWORD}" ] && [ "${MYSQL_ALLOW_EMPTY_PASSWORD}" != "true" ]; then
+    if [ ! -n "${MYSQL_USER}" ] && [ ! -n "${MYSQL_ROOT_PASSWORD}" ] && [ "${MYSQL_ALLOW_EMPTY_PASSWORD,,}" != "true" ]; then
         echo "*** Impossible to use MySQL server because 'root' password is not defined and it is not empty"
         exit 1
     fi
 
-    if [ "${MYSQL_ALLOW_EMPTY_PASSWORD}" == "true" ] || [ -n "${MYSQL_ROOT_PASSWORD}" ]; then
+    if [ "${MYSQL_ALLOW_EMPTY_PASSWORD,,}" == "true" ] || [ -n "${MYSQL_ROOT_PASSWORD}" ]; then
         USE_DB_ROOT_USER=true
         DB_SERVER_ROOT_USER="root"
         DB_SERVER_ROOT_PASS=${MYSQL_ROOT_PASSWORD:-""}
@@ -170,7 +170,7 @@ check_variables_mysql() {
 
     # If root password is not specified use provided credentials
     DB_SERVER_ROOT_USER=${DB_SERVER_ROOT_USER:-${MYSQL_USER}}
-    [ "${MYSQL_ALLOW_EMPTY_PASSWORD}" == "true" ] || DB_SERVER_ROOT_PASS=${DB_SERVER_ROOT_PASS:-${MYSQL_PASSWORD}}
+    [ "${MYSQL_ALLOW_EMPTY_PASSWORD,,}" == "true" ] || DB_SERVER_ROOT_PASS=${DB_SERVER_ROOT_PASS:-${MYSQL_PASSWORD}}
     DB_SERVER_ZBX_USER=${MYSQL_USER:-"zabbix"}
     DB_SERVER_ZBX_PASS=${MYSQL_PASSWORD:-"zabbix"}
 
@@ -208,7 +208,7 @@ check_db_connect_mysql() {
     echo "* DB_SERVER_HOST: ${DB_SERVER_HOST}"
     echo "* DB_SERVER_PORT: ${DB_SERVER_PORT}"
     echo "* DB_SERVER_DBNAME: ${DB_SERVER_DBNAME}"
-    if [ "${DEBUG_MODE}" == "true" ]; then
+    if [ "${DEBUG_MODE,,}" == "true" ]; then
         if [ "${USE_DB_ROOT_USER}" == "true" ]; then
             echo "* DB_SERVER_ROOT_USER: ${DB_SERVER_ROOT_USER}"
             echo "* DB_SERVER_ROOT_PASS: ${DB_SERVER_ROOT_PASS}"
@@ -378,7 +378,7 @@ update_zbx_config() {
     update_config_var $ZBX_CONFIG "StartHTTPPollers" "${ZBX_STARTHTTPPOLLERS}"
 
     : ${ZBX_JAVAGATEWAY_ENABLE:="false"}
-    if [ "${ZBX_JAVAGATEWAY_ENABLE}" == "true" ]; then
+    if [ "${ZBX_JAVAGATEWAY_ENABLE,,}" == "true" ]; then
         update_config_var $ZBX_CONFIG "JavaGateway" "${ZBX_JAVAGATEWAY:-"zabbix-java-gateway"}"
         update_config_var $ZBX_CONFIG "JavaGatewayPort" "${ZBX_JAVAGATEWAYPORT}"
         update_config_var $ZBX_CONFIG "StartJavaPollers" "${ZBX_STARTJAVAPOLLERS:-"5"}"
@@ -395,7 +395,7 @@ update_zbx_config() {
     update_config_var $ZBX_CONFIG "VMwareTimeout" "${ZBX_VMWARETIMEOUT}"
 
     : ${ZBX_ENABLE_SNMP_TRAPS:="false"}
-    if [ "${ZBX_ENABLE_SNMP_TRAPS}" == "true" ]; then
+    if [ "${ZBX_ENABLE_SNMP_TRAPS,,}" == "true" ]; then
         update_config_var $ZBX_CONFIG "SNMPTrapperFile" "${ZABBIX_USER_HOME_DIR}/snmptraps/snmptraps.log"
         update_config_var $ZBX_CONFIG "StartSNMPTrapper" "1"
     else
diff --git a/proxy-mysql/centos/docker-entrypoint.sh b/proxy-mysql/centos/docker-entrypoint.sh
index 45ac14e12..87ae89274 100755
--- a/proxy-mysql/centos/docker-entrypoint.sh
+++ b/proxy-mysql/centos/docker-entrypoint.sh
@@ -5,7 +5,7 @@ set -o pipefail
 set +e
 
 # Script trace mode
-if [ "${DEBUG_MODE}" == "true" ]; then
+if [ "${DEBUG_MODE,,}" == "true" ]; then
     set -o xtrace
 fi
 
@@ -150,17 +150,17 @@ check_variables_mysql() {
 
     file_env MYSQL_ROOT_PASSWORD
 
-    if [ ! -n "${MYSQL_USER}" ] && [ "${MYSQL_RANDOM_ROOT_PASSWORD}" == "true" ]; then
+    if [ ! -n "${MYSQL_USER}" ] && [ "${MYSQL_RANDOM_ROOT_PASSWORD,,}" == "true" ]; then
         echo "**** Impossible to use MySQL server because of unknown Zabbix user and random 'root' password"
         exit 1
     fi
 
-    if [ ! -n "${MYSQL_USER}" ] && [ ! -n "${MYSQL_ROOT_PASSWORD}" ] && [ "${MYSQL_ALLOW_EMPTY_PASSWORD}" != "true" ]; then
+    if [ ! -n "${MYSQL_USER}" ] && [ ! -n "${MYSQL_ROOT_PASSWORD}" ] && [ "${MYSQL_ALLOW_EMPTY_PASSWORD,,}" != "true" ]; then
         echo "*** Impossible to use MySQL server because 'root' password is not defined and it is not empty"
         exit 1
     fi
 
-    if [ "${MYSQL_ALLOW_EMPTY_PASSWORD}" == "true" ] || [ -n "${MYSQL_ROOT_PASSWORD}" ]; then
+    if [ "${MYSQL_ALLOW_EMPTY_PASSWORD,,}" == "true" ] || [ -n "${MYSQL_ROOT_PASSWORD}" ]; then
         USE_DB_ROOT_USER=true
         DB_SERVER_ROOT_USER="root"
         DB_SERVER_ROOT_PASS=${MYSQL_ROOT_PASSWORD:-""}
@@ -170,7 +170,7 @@ check_variables_mysql() {
 
     # If root password is not specified use provided credentials
     DB_SERVER_ROOT_USER=${DB_SERVER_ROOT_USER:-${MYSQL_USER}}
-    [ "${MYSQL_ALLOW_EMPTY_PASSWORD}" == "true" ] || DB_SERVER_ROOT_PASS=${DB_SERVER_ROOT_PASS:-${MYSQL_PASSWORD}}
+    [ "${MYSQL_ALLOW_EMPTY_PASSWORD,,}" == "true" ] || DB_SERVER_ROOT_PASS=${DB_SERVER_ROOT_PASS:-${MYSQL_PASSWORD}}
     DB_SERVER_ZBX_USER=${MYSQL_USER:-"zabbix"}
     DB_SERVER_ZBX_PASS=${MYSQL_PASSWORD:-"zabbix"}
 
@@ -206,7 +206,7 @@ check_db_connect_mysql() {
     echo "* DB_SERVER_HOST: ${DB_SERVER_HOST}"
     echo "* DB_SERVER_PORT: ${DB_SERVER_PORT}"
     echo "* DB_SERVER_DBNAME: ${DB_SERVER_DBNAME}"
-    if [ "${DEBUG_MODE}" == "true" ]; then
+    if [ "${DEBUG_MODE,,}" == "true" ]; then
         if [ "${USE_DB_ROOT_USER}" == "true" ]; then
             echo "* DB_SERVER_ROOT_USER: ${DB_SERVER_ROOT_USER}"
             echo "* DB_SERVER_ROOT_PASS: ${DB_SERVER_ROOT_PASS}"
@@ -376,7 +376,7 @@ update_zbx_config() {
     update_config_var $ZBX_CONFIG "StartHTTPPollers" "${ZBX_STARTHTTPPOLLERS}"
 
     : ${ZBX_JAVAGATEWAY_ENABLE:="false"}
-    if [ "${ZBX_JAVAGATEWAY_ENABLE}" == "true" ]; then
+    if [ "${ZBX_JAVAGATEWAY_ENABLE,,}" == "true" ]; then
         update_config_var $ZBX_CONFIG "JavaGateway" "${ZBX_JAVAGATEWAY:-"zabbix-java-gateway"}"
         update_config_var $ZBX_CONFIG "JavaGatewayPort" "${ZBX_JAVAGATEWAYPORT}"
         update_config_var $ZBX_CONFIG "StartJavaPollers" "${ZBX_STARTJAVAPOLLERS:-"5"}"
@@ -393,7 +393,7 @@ update_zbx_config() {
     update_config_var $ZBX_CONFIG "VMwareTimeout" "${ZBX_VMWARETIMEOUT}"
 
     : ${ZBX_ENABLE_SNMP_TRAPS:="false"}
-    if [ "${ZBX_ENABLE_SNMP_TRAPS}" == "true" ]; then
+    if [ "${ZBX_ENABLE_SNMP_TRAPS,,}" == "true" ]; then
         update_config_var $ZBX_CONFIG "SNMPTrapperFile" "${ZABBIX_USER_HOME_DIR}/snmptraps/snmptraps.log"
         update_config_var $ZBX_CONFIG "StartSNMPTrapper" "1"
     else
diff --git a/proxy-mysql/ubuntu/docker-entrypoint.sh b/proxy-mysql/ubuntu/docker-entrypoint.sh
index 8c6dd377c..ced972b18 100755
--- a/proxy-mysql/ubuntu/docker-entrypoint.sh
+++ b/proxy-mysql/ubuntu/docker-entrypoint.sh
@@ -5,7 +5,7 @@ set -o pipefail
 set +e
 
 # Script trace mode
-if [ "${DEBUG_MODE}" == "true" ]; then
+if [ "${DEBUG_MODE,,}" == "true" ]; then
     set -o xtrace
 fi
 
@@ -150,17 +150,17 @@ check_variables_mysql() {
 
     file_env MYSQL_ROOT_PASSWORD
 
-    if [ ! -n "${MYSQL_USER}" ] && [ "${MYSQL_RANDOM_ROOT_PASSWORD}" == "true" ]; then
+    if [ ! -n "${MYSQL_USER}" ] && [ "${MYSQL_RANDOM_ROOT_PASSWORD,,}" == "true" ]; then
         echo "**** Impossible to use MySQL server because of unknown Zabbix user and random 'root' password"
         exit 1
     fi
 
-    if [ ! -n "${MYSQL_USER}" ] && [ ! -n "${MYSQL_ROOT_PASSWORD}" ] && [ "${MYSQL_ALLOW_EMPTY_PASSWORD}" != "true" ]; then
+    if [ ! -n "${MYSQL_USER}" ] && [ ! -n "${MYSQL_ROOT_PASSWORD}" ] && [ "${MYSQL_ALLOW_EMPTY_PASSWORD,,}" != "true" ]; then
         echo "*** Impossible to use MySQL server because 'root' password is not defined and it is not empty"
         exit 1
     fi
 
-    if [ "${MYSQL_ALLOW_EMPTY_PASSWORD}" == "true" ] || [ -n "${MYSQL_ROOT_PASSWORD}" ]; then
+    if [ "${MYSQL_ALLOW_EMPTY_PASSWORD,,}" == "true" ] || [ -n "${MYSQL_ROOT_PASSWORD}" ]; then
         USE_DB_ROOT_USER=true
         DB_SERVER_ROOT_USER="root"
         DB_SERVER_ROOT_PASS=${MYSQL_ROOT_PASSWORD:-""}
@@ -170,7 +170,7 @@ check_variables_mysql() {
 
     # If root password is not specified use provided credentials
     DB_SERVER_ROOT_USER=${DB_SERVER_ROOT_USER:-${MYSQL_USER}}
-    [ "${MYSQL_ALLOW_EMPTY_PASSWORD}" == "true" ] || DB_SERVER_ROOT_PASS=${DB_SERVER_ROOT_PASS:-${MYSQL_PASSWORD}}
+    [ "${MYSQL_ALLOW_EMPTY_PASSWORD,,}" == "true" ] || DB_SERVER_ROOT_PASS=${DB_SERVER_ROOT_PASS:-${MYSQL_PASSWORD}}
     DB_SERVER_ZBX_USER=${MYSQL_USER:-"zabbix"}
     DB_SERVER_ZBX_PASS=${MYSQL_PASSWORD:-"zabbix"}
 
@@ -205,7 +205,7 @@ check_db_connect_mysql() {
     echo "* DB_SERVER_HOST: ${DB_SERVER_HOST}"
     echo "* DB_SERVER_PORT: ${DB_SERVER_PORT}"
     echo "* DB_SERVER_DBNAME: ${DB_SERVER_DBNAME}"
-    if [ "${DEBUG_MODE}" == "true" ]; then
+    if [ "${DEBUG_MODE,,}" == "true" ]; then
         if [ "${USE_DB_ROOT_USER}" == "true" ]; then
             echo "* DB_SERVER_ROOT_USER: ${DB_SERVER_ROOT_USER}"
             echo "* DB_SERVER_ROOT_PASS: ${DB_SERVER_ROOT_PASS}"
@@ -375,7 +375,7 @@ update_zbx_config() {
     update_config_var $ZBX_CONFIG "StartHTTPPollers" "${ZBX_STARTHTTPPOLLERS}"
 
     : ${ZBX_JAVAGATEWAY_ENABLE:="false"}
-    if [ "${ZBX_JAVAGATEWAY_ENABLE}" == "true" ]; then
+    if [ "${ZBX_JAVAGATEWAY_ENABLE,,}" == "true" ]; then
         update_config_var $ZBX_CONFIG "JavaGateway" "${ZBX_JAVAGATEWAY:-"zabbix-java-gateway"}"
         update_config_var $ZBX_CONFIG "JavaGatewayPort" "${ZBX_JAVAGATEWAYPORT}"
         update_config_var $ZBX_CONFIG "StartJavaPollers" "${ZBX_STARTJAVAPOLLERS:-"5"}"
@@ -392,7 +392,7 @@ update_zbx_config() {
     update_config_var $ZBX_CONFIG "VMwareTimeout" "${ZBX_VMWARETIMEOUT}"
 
     : ${ZBX_ENABLE_SNMP_TRAPS:="false"}
-    if [ "${ZBX_ENABLE_SNMP_TRAPS}" == "true" ]; then
+    if [ "${ZBX_ENABLE_SNMP_TRAPS,,}" == "true" ]; then
         update_config_var $ZBX_CONFIG "SNMPTrapperFile" "${ZABBIX_USER_HOME_DIR}/snmptraps/snmptraps.log"
         update_config_var $ZBX_CONFIG "StartSNMPTrapper" "1"
     else
diff --git a/proxy-sqlite3/alpine/docker-entrypoint.sh b/proxy-sqlite3/alpine/docker-entrypoint.sh
index 4fae7846d..229d56a92 100755
--- a/proxy-sqlite3/alpine/docker-entrypoint.sh
+++ b/proxy-sqlite3/alpine/docker-entrypoint.sh
@@ -5,7 +5,7 @@ set -o pipefail
 set +e
 
 # Script trace mode
-if [ "${DEBUG_MODE}" == "true" ]; then
+if [ "${DEBUG_MODE,,}" == "true" ]; then
     set -o xtrace
 fi
 
@@ -170,7 +170,7 @@ update_zbx_config() {
     update_config_var $ZBX_CONFIG "StartHTTPPollers" "${ZBX_STARTHTTPPOLLERS}"
 
     : ${ZBX_JAVAGATEWAY_ENABLE:="false"}
-    if [ "${ZBX_JAVAGATEWAY_ENABLE}" == "true" ]; then
+    if [ "${ZBX_JAVAGATEWAY_ENABLE,,}" == "true" ]; then
         update_config_var $ZBX_CONFIG "JavaGateway" "${ZBX_JAVAGATEWAY:-"zabbix-java-gateway"}"
         update_config_var $ZBX_CONFIG "JavaGatewayPort" "${ZBX_JAVAGATEWAYPORT}"
         update_config_var $ZBX_CONFIG "StartJavaPollers" "${ZBX_STARTJAVAPOLLERS:-"5"}"
@@ -187,7 +187,7 @@ update_zbx_config() {
     update_config_var $ZBX_CONFIG "VMwareTimeout" "${ZBX_VMWARETIMEOUT}"
 
     : ${ZBX_ENABLE_SNMP_TRAPS:="false"}
-    if [ "${ZBX_ENABLE_SNMP_TRAPS}" == "true" ]; then
+    if [ "${ZBX_ENABLE_SNMP_TRAPS,,}" == "true" ]; then
         update_config_var $ZBX_CONFIG "SNMPTrapperFile" "${ZABBIX_USER_HOME_DIR}/snmptraps/snmptraps.log"
         update_config_var $ZBX_CONFIG "StartSNMPTrapper" "1"
     else
diff --git a/proxy-sqlite3/centos/docker-entrypoint.sh b/proxy-sqlite3/centos/docker-entrypoint.sh
index 4fae7846d..229d56a92 100755
--- a/proxy-sqlite3/centos/docker-entrypoint.sh
+++ b/proxy-sqlite3/centos/docker-entrypoint.sh
@@ -5,7 +5,7 @@ set -o pipefail
 set +e
 
 # Script trace mode
-if [ "${DEBUG_MODE}" == "true" ]; then
+if [ "${DEBUG_MODE,,}" == "true" ]; then
     set -o xtrace
 fi
 
@@ -170,7 +170,7 @@ update_zbx_config() {
     update_config_var $ZBX_CONFIG "StartHTTPPollers" "${ZBX_STARTHTTPPOLLERS}"
 
     : ${ZBX_JAVAGATEWAY_ENABLE:="false"}
-    if [ "${ZBX_JAVAGATEWAY_ENABLE}" == "true" ]; then
+    if [ "${ZBX_JAVAGATEWAY_ENABLE,,}" == "true" ]; then
         update_config_var $ZBX_CONFIG "JavaGateway" "${ZBX_JAVAGATEWAY:-"zabbix-java-gateway"}"
         update_config_var $ZBX_CONFIG "JavaGatewayPort" "${ZBX_JAVAGATEWAYPORT}"
         update_config_var $ZBX_CONFIG "StartJavaPollers" "${ZBX_STARTJAVAPOLLERS:-"5"}"
@@ -187,7 +187,7 @@ update_zbx_config() {
     update_config_var $ZBX_CONFIG "VMwareTimeout" "${ZBX_VMWARETIMEOUT}"
 
     : ${ZBX_ENABLE_SNMP_TRAPS:="false"}
-    if [ "${ZBX_ENABLE_SNMP_TRAPS}" == "true" ]; then
+    if [ "${ZBX_ENABLE_SNMP_TRAPS,,}" == "true" ]; then
         update_config_var $ZBX_CONFIG "SNMPTrapperFile" "${ZABBIX_USER_HOME_DIR}/snmptraps/snmptraps.log"
         update_config_var $ZBX_CONFIG "StartSNMPTrapper" "1"
     else
diff --git a/proxy-sqlite3/ubuntu/docker-entrypoint.sh b/proxy-sqlite3/ubuntu/docker-entrypoint.sh
index c991f3974..5bc90dac0 100755
--- a/proxy-sqlite3/ubuntu/docker-entrypoint.sh
+++ b/proxy-sqlite3/ubuntu/docker-entrypoint.sh
@@ -5,7 +5,7 @@ set -o pipefail
 set +e
 
 # Script trace mode
-if [ "${DEBUG_MODE}" == "true" ]; then
+if [ "${DEBUG_MODE,,}" == "true" ]; then
     set -o xtrace
 fi
 
@@ -170,7 +170,7 @@ update_zbx_config() {
     update_config_var $ZBX_CONFIG "StartHTTPPollers" "${ZBX_STARTHTTPPOLLERS}"
 
     : ${ZBX_JAVAGATEWAY_ENABLE:="false"}
-    if [ "${ZBX_JAVAGATEWAY_ENABLE}" == "true" ]; then
+    if [ "${ZBX_JAVAGATEWAY_ENABLE,,}" == "true" ]; then
         update_config_var $ZBX_CONFIG "JavaGateway" "${ZBX_JAVAGATEWAY:-"zabbix-java-gateway"}"
         update_config_var $ZBX_CONFIG "JavaGatewayPort" "${ZBX_JAVAGATEWAYPORT}"
         update_config_var $ZBX_CONFIG "StartJavaPollers" "${ZBX_STARTJAVAPOLLERS:-"5"}"
@@ -187,7 +187,7 @@ update_zbx_config() {
     update_config_var $ZBX_CONFIG "VMwareTimeout" "${ZBX_VMWARETIMEOUT}"
 
     : ${ZBX_ENABLE_SNMP_TRAPS:="false"}
-    if [ "${ZBX_ENABLE_SNMP_TRAPS}" == "true" ]; then
+    if [ "${ZBX_ENABLE_SNMP_TRAPS,,}" == "true" ]; then
         update_config_var $ZBX_CONFIG "SNMPTrapperFile" "${ZABBIX_USER_HOME_DIR}/snmptraps/snmptraps.log"
         update_config_var $ZBX_CONFIG "StartSNMPTrapper" "1"
     else
diff --git a/server-mysql/alpine/docker-entrypoint.sh b/server-mysql/alpine/docker-entrypoint.sh
index 50605bc0f..ae23bc659 100755
--- a/server-mysql/alpine/docker-entrypoint.sh
+++ b/server-mysql/alpine/docker-entrypoint.sh
@@ -5,7 +5,7 @@ set -o pipefail
 set +e
 
 # Script trace mode
-if [ "${DEBUG_MODE}" == "true" ]; then
+if [ "${DEBUG_MODE,,}" == "true" ]; then
     set -o xtrace
 fi
 
@@ -145,17 +145,17 @@ check_variables_mysql() {
 
     file_env MYSQL_ROOT_PASSWORD
 
-    if [ ! -n "${MYSQL_USER}" ] && [ "${MYSQL_RANDOM_ROOT_PASSWORD}" == "true" ]; then
+    if [ ! -n "${MYSQL_USER}" ] && [ "${MYSQL_RANDOM_ROOT_PASSWORD,,}" == "true" ]; then
         echo "**** Impossible to use MySQL server because of unknown Zabbix user and random 'root' password"
         exit 1
     fi
 
-    if [ ! -n "${MYSQL_USER}" ] && [ ! -n "${MYSQL_ROOT_PASSWORD}" ] && [ "${MYSQL_ALLOW_EMPTY_PASSWORD}" != "true" ]; then
+    if [ ! -n "${MYSQL_USER}" ] && [ ! -n "${MYSQL_ROOT_PASSWORD}" ] && [ "${MYSQL_ALLOW_EMPTY_PASSWORD,,}" != "true" ]; then
         echo "*** Impossible to use MySQL server because 'root' password is not defined and it is not empty"
         exit 1
     fi
 
-    if [ "${MYSQL_ALLOW_EMPTY_PASSWORD}" == "true" ] || [ -n "${MYSQL_ROOT_PASSWORD}" ]; then
+    if [ "${MYSQL_ALLOW_EMPTY_PASSWORD,,}" == "true" ] || [ -n "${MYSQL_ROOT_PASSWORD}" ]; then
         USE_DB_ROOT_USER=true
         DB_SERVER_ROOT_USER="root"
         DB_SERVER_ROOT_PASS=${MYSQL_ROOT_PASSWORD:-""}
@@ -165,7 +165,7 @@ check_variables_mysql() {
 
     # If root password is not specified use provided credentials
     : ${DB_SERVER_ROOT_USER:=${MYSQL_USER}}
-    [ "${MYSQL_ALLOW_EMPTY_PASSWORD}" == "true" ] || DB_SERVER_ROOT_PASS=${DB_SERVER_ROOT_PASS:-${MYSQL_PASSWORD}}
+    [ "${MYSQL_ALLOW_EMPTY_PASSWORD,,}" == "true" ] || DB_SERVER_ROOT_PASS=${DB_SERVER_ROOT_PASS:-${MYSQL_PASSWORD}}
     DB_SERVER_ZBX_USER=${MYSQL_USER:-"zabbix"}
     DB_SERVER_ZBX_PASS=${MYSQL_PASSWORD:-"zabbix"}
 
@@ -203,7 +203,7 @@ check_db_connect_mysql() {
     echo "* DB_SERVER_HOST: ${DB_SERVER_HOST}"
     echo "* DB_SERVER_PORT: ${DB_SERVER_PORT}"
     echo "* DB_SERVER_DBNAME: ${DB_SERVER_DBNAME}"
-    if [ "${DEBUG_MODE}" == "true" ]; then
+    if [ "${DEBUG_MODE,,}" == "true" ]; then
         if [ "${USE_DB_ROOT_USER}" == "true" ]; then
             echo "* DB_SERVER_ROOT_USER: ${DB_SERVER_ROOT_USER}"
             echo "* DB_SERVER_ROOT_PASS: ${DB_SERVER_ROOT_PASS}"
@@ -365,7 +365,7 @@ update_zbx_config() {
     update_config_var $ZBX_CONFIG "StartLLDProcessors" "${ZBX_STARTLLDPROCESSORS}"
 
     : ${ZBX_JAVAGATEWAY_ENABLE:="false"}
-    if [ "${ZBX_JAVAGATEWAY_ENABLE}" == "true" ]; then
+    if [ "${ZBX_JAVAGATEWAY_ENABLE,,}" == "true" ]; then
         update_config_var $ZBX_CONFIG "JavaGateway" "${ZBX_JAVAGATEWAY:-"zabbix-java-gateway"}"
         update_config_var $ZBX_CONFIG "JavaGatewayPort" "${ZBX_JAVAGATEWAYPORT}"
         update_config_var $ZBX_CONFIG "StartJavaPollers" "${ZBX_STARTJAVAPOLLERS:-"5"}"
@@ -382,7 +382,7 @@ update_zbx_config() {
     update_config_var $ZBX_CONFIG "VMwareTimeout" "${ZBX_VMWARETIMEOUT}"
 
     : ${ZBX_ENABLE_SNMP_TRAPS:="false"}
-    if [ "${ZBX_ENABLE_SNMP_TRAPS}" == "true" ]; then
+    if [ "${ZBX_ENABLE_SNMP_TRAPS,,}" == "true" ]; then
         update_config_var $ZBX_CONFIG "SNMPTrapperFile" "${ZABBIX_USER_HOME_DIR}/snmptraps/snmptraps.log"
         update_config_var $ZBX_CONFIG "StartSNMPTrapper" "1"
     else
diff --git a/server-mysql/centos/docker-entrypoint.sh b/server-mysql/centos/docker-entrypoint.sh
index 0527f89c3..3aa594d5d 100755
--- a/server-mysql/centos/docker-entrypoint.sh
+++ b/server-mysql/centos/docker-entrypoint.sh
@@ -5,7 +5,7 @@ set -o pipefail
 set +e
 
 # Script trace mode
-if [ "${DEBUG_MODE}" == "true" ]; then
+if [ "${DEBUG_MODE,,}" == "true" ]; then
     set -o xtrace
 fi
 
@@ -145,17 +145,17 @@ check_variables_mysql() {
 
     file_env MYSQL_ROOT_PASSWORD
 
-    if [ ! -n "${MYSQL_USER}" ] && [ "${MYSQL_RANDOM_ROOT_PASSWORD}" == "true" ]; then
+    if [ ! -n "${MYSQL_USER}" ] && [ "${MYSQL_RANDOM_ROOT_PASSWORD,,}" == "true" ]; then
         echo "**** Impossible to use MySQL server because of unknown Zabbix user and random 'root' password"
         exit 1
     fi
 
-    if [ ! -n "${MYSQL_USER}" ] && [ ! -n "${MYSQL_ROOT_PASSWORD}" ] && [ "${MYSQL_ALLOW_EMPTY_PASSWORD}" != "true" ]; then
+    if [ ! -n "${MYSQL_USER}" ] && [ ! -n "${MYSQL_ROOT_PASSWORD}" ] && [ "${MYSQL_ALLOW_EMPTY_PASSWORD,,}" != "true" ]; then
         echo "*** Impossible to use MySQL server because 'root' password is not defined and it is not empty"
         exit 1
     fi
 
-    if [ "${MYSQL_ALLOW_EMPTY_PASSWORD}" == "true" ] || [ -n "${MYSQL_ROOT_PASSWORD}" ]; then
+    if [ "${MYSQL_ALLOW_EMPTY_PASSWORD,,}" == "true" ] || [ -n "${MYSQL_ROOT_PASSWORD}" ]; then
         USE_DB_ROOT_USER=true
         DB_SERVER_ROOT_USER="root"
         DB_SERVER_ROOT_PASS=${MYSQL_ROOT_PASSWORD:-""}
@@ -165,7 +165,7 @@ check_variables_mysql() {
 
     # If root password is not specified use provided credentials
     : ${DB_SERVER_ROOT_USER:=${MYSQL_USER}}
-    [ "${MYSQL_ALLOW_EMPTY_PASSWORD}" == "true" ] || DB_SERVER_ROOT_PASS=${DB_SERVER_ROOT_PASS:-${MYSQL_PASSWORD}}
+    [ "${MYSQL_ALLOW_EMPTY_PASSWORD,,}" == "true" ] || DB_SERVER_ROOT_PASS=${DB_SERVER_ROOT_PASS:-${MYSQL_PASSWORD}}
     DB_SERVER_ZBX_USER=${MYSQL_USER:-"zabbix"}
     DB_SERVER_ZBX_PASS=${MYSQL_PASSWORD:-"zabbix"}
 
@@ -200,7 +200,7 @@ check_db_connect_mysql() {
     echo "* DB_SERVER_HOST: ${DB_SERVER_HOST}"
     echo "* DB_SERVER_PORT: ${DB_SERVER_PORT}"
     echo "* DB_SERVER_DBNAME: ${DB_SERVER_DBNAME}"
-    if [ "${DEBUG_MODE}" == "true" ]; then
+    if [ "${DEBUG_MODE,,}" == "true" ]; then
         if [ "${USE_DB_ROOT_USER}" == "true" ]; then
             echo "* DB_SERVER_ROOT_USER: ${DB_SERVER_ROOT_USER}"
             echo "* DB_SERVER_ROOT_PASS: ${DB_SERVER_ROOT_PASS}"
@@ -362,7 +362,7 @@ update_zbx_config() {
     update_config_var $ZBX_CONFIG "StartLLDProcessors" "${ZBX_STARTLLDPROCESSORS}"
 
     : ${ZBX_JAVAGATEWAY_ENABLE:="false"}
-    if [ "${ZBX_JAVAGATEWAY_ENABLE}" == "true" ]; then
+    if [ "${ZBX_JAVAGATEWAY_ENABLE,,}" == "true" ]; then
         update_config_var $ZBX_CONFIG "JavaGateway" "${ZBX_JAVAGATEWAY:-"zabbix-java-gateway"}"
         update_config_var $ZBX_CONFIG "JavaGatewayPort" "${ZBX_JAVAGATEWAYPORT}"
         update_config_var $ZBX_CONFIG "StartJavaPollers" "${ZBX_STARTJAVAPOLLERS:-"5"}"
@@ -379,7 +379,7 @@ update_zbx_config() {
     update_config_var $ZBX_CONFIG "VMwareTimeout" "${ZBX_VMWARETIMEOUT}"
 
     : ${ZBX_ENABLE_SNMP_TRAPS:="false"}
-    if [ "${ZBX_ENABLE_SNMP_TRAPS}" == "true" ]; then
+    if [ "${ZBX_ENABLE_SNMP_TRAPS,,}" == "true" ]; then
         update_config_var $ZBX_CONFIG "SNMPTrapperFile" "${ZABBIX_USER_HOME_DIR}/snmptraps/snmptraps.log"
         update_config_var $ZBX_CONFIG "StartSNMPTrapper" "1"
     else
diff --git a/server-mysql/ubuntu/docker-entrypoint.sh b/server-mysql/ubuntu/docker-entrypoint.sh
index d67944c92..84a89d077 100755
--- a/server-mysql/ubuntu/docker-entrypoint.sh
+++ b/server-mysql/ubuntu/docker-entrypoint.sh
@@ -5,7 +5,7 @@ set -o pipefail
 set +e
 
 # Script trace mode
-if [ "${DEBUG_MODE}" == "true" ]; then
+if [ "${DEBUG_MODE,,}" == "true" ]; then
     set -o xtrace
 fi
 
@@ -145,17 +145,17 @@ check_variables_mysql() {
 
     file_env MYSQL_ROOT_PASSWORD
 
-    if [ ! -n "${MYSQL_USER}" ] && [ "${MYSQL_RANDOM_ROOT_PASSWORD}" == "true" ]; then
+    if [ ! -n "${MYSQL_USER}" ] && [ "${MYSQL_RANDOM_ROOT_PASSWORD,,}" == "true" ]; then
         echo "**** Impossible to use MySQL server because of unknown Zabbix user and random 'root' password"
         exit 1
     fi
 
-    if [ ! -n "${MYSQL_USER}" ] && [ ! -n "${MYSQL_ROOT_PASSWORD}" ] && [ "${MYSQL_ALLOW_EMPTY_PASSWORD}" != "true" ]; then
+    if [ ! -n "${MYSQL_USER}" ] && [ ! -n "${MYSQL_ROOT_PASSWORD}" ] && [ "${MYSQL_ALLOW_EMPTY_PASSWORD,,}" != "true" ]; then
         echo "*** Impossible to use MySQL server because 'root' password is not defined and it is not empty"
         exit 1
     fi
 
-    if [ "${MYSQL_ALLOW_EMPTY_PASSWORD}" == "true" ] || [ -n "${MYSQL_ROOT_PASSWORD}" ]; then
+    if [ "${MYSQL_ALLOW_EMPTY_PASSWORD,,}" == "true" ] || [ -n "${MYSQL_ROOT_PASSWORD}" ]; then
         USE_DB_ROOT_USER=true
         DB_SERVER_ROOT_USER="root"
         DB_SERVER_ROOT_PASS=${MYSQL_ROOT_PASSWORD:-""}
@@ -165,7 +165,7 @@ check_variables_mysql() {
 
     # If root password is not specified use provided credentials
     : ${DB_SERVER_ROOT_USER:=${MYSQL_USER}}
-    [ "${MYSQL_ALLOW_EMPTY_PASSWORD}" == "true" ] || DB_SERVER_ROOT_PASS=${DB_SERVER_ROOT_PASS:-${MYSQL_PASSWORD}}
+    [ "${MYSQL_ALLOW_EMPTY_PASSWORD,,}" == "true" ] || DB_SERVER_ROOT_PASS=${DB_SERVER_ROOT_PASS:-${MYSQL_PASSWORD}}
     DB_SERVER_ZBX_USER=${MYSQL_USER:-"zabbix"}
     DB_SERVER_ZBX_PASS=${MYSQL_PASSWORD:-"zabbix"}
 
@@ -200,7 +200,7 @@ check_db_connect_mysql() {
     echo "* DB_SERVER_HOST: ${DB_SERVER_HOST}"
     echo "* DB_SERVER_PORT: ${DB_SERVER_PORT}"
     echo "* DB_SERVER_DBNAME: ${DB_SERVER_DBNAME}"
-    if [ "${DEBUG_MODE}" == "true" ]; then
+    if [ "${DEBUG_MODE,,}" == "true" ]; then
         if [ "${USE_DB_ROOT_USER}" == "true" ]; then
             echo "* DB_SERVER_ROOT_USER: ${DB_SERVER_ROOT_USER}"
             echo "* DB_SERVER_ROOT_PASS: ${DB_SERVER_ROOT_PASS}"
@@ -362,7 +362,7 @@ update_zbx_config() {
     update_config_var $ZBX_CONFIG "StartLLDProcessors" "${ZBX_STARTLLDPROCESSORS}"
 
     : ${ZBX_JAVAGATEWAY_ENABLE:="false"}
-    if [ "${ZBX_JAVAGATEWAY_ENABLE}" == "true" ]; then
+    if [ "${ZBX_JAVAGATEWAY_ENABLE,,}" == "true" ]; then
         update_config_var $ZBX_CONFIG "JavaGateway" "${ZBX_JAVAGATEWAY:-"zabbix-java-gateway"}"
         update_config_var $ZBX_CONFIG "JavaGatewayPort" "${ZBX_JAVAGATEWAYPORT}"
         update_config_var $ZBX_CONFIG "StartJavaPollers" "${ZBX_STARTJAVAPOLLERS:-"5"}"
@@ -379,7 +379,7 @@ update_zbx_config() {
     update_config_var $ZBX_CONFIG "VMwareTimeout" "${ZBX_VMWARETIMEOUT}"
 
     : ${ZBX_ENABLE_SNMP_TRAPS:="false"}
-    if [ "${ZBX_ENABLE_SNMP_TRAPS}" == "true" ]; then
+    if [ "${ZBX_ENABLE_SNMP_TRAPS,,}" == "true" ]; then
         update_config_var $ZBX_CONFIG "SNMPTrapperFile" "${ZABBIX_USER_HOME_DIR}/snmptraps/snmptraps.log"
         update_config_var $ZBX_CONFIG "StartSNMPTrapper" "1"
     else
diff --git a/server-pgsql/alpine/docker-entrypoint.sh b/server-pgsql/alpine/docker-entrypoint.sh
index 48c0e6914..d0ac418ec 100755
--- a/server-pgsql/alpine/docker-entrypoint.sh
+++ b/server-pgsql/alpine/docker-entrypoint.sh
@@ -5,12 +5,12 @@ set -o pipefail
 set +e
 
 # Script trace mode
-if [ "${DEBUG_MODE}" == "true" ]; then
+if [ "${DEBUG_MODE,,}" == "true" ]; then
     set -o xtrace
 fi
 
 #Enable PostgreSQL timescaleDB feature:
-ENABLE_TIMESCALEDB=${ENABLE_TIMESCALEDB:-"false"}
+: ${ENABLE_TIMESCALEDB:="false"}
 
 # Default directories
 # User 'zabbix' home directory
@@ -162,7 +162,7 @@ check_db_connect_postgresql() {
     echo "* DB_SERVER_PORT: ${DB_SERVER_PORT}"
     echo "* DB_SERVER_DBNAME: ${DB_SERVER_DBNAME}"
     echo "* DB_SERVER_SCHEMA: ${DB_SERVER_SCHEMA}"
-    if [ "${DEBUG_MODE}" == "true" ]; then
+    if [ "${DEBUG_MODE,,}" == "true" ]; then
         echo "* DB_SERVER_ZBX_USER: ${DB_SERVER_ZBX_USER}"
         echo "* DB_SERVER_ZBX_PASS: ${DB_SERVER_ZBX_PASS}"
     fi
@@ -288,7 +288,7 @@ create_db_schema_postgresql() {
     if [ -z "${ZBX_DB_VERSION}" ]; then
         echo "** Creating '${DB_SERVER_DBNAME}' schema in PostgreSQL"
 
-        if [ "${ENABLE_TIMESCALEDB}" == "true" ]; then
+        if [ "${ENABLE_TIMESCALEDB,,}" == "true" ]; then
             psql_query "CREATE EXTENSION IF NOT EXISTS timescaledb CASCADE;"
         fi
 
@@ -312,7 +312,7 @@ create_db_schema_postgresql() {
                 --host "${DB_SERVER_HOST}" --port "${DB_SERVER_PORT}" \
                 --username "${DB_SERVER_ZBX_USER}" --dbname "${DB_SERVER_DBNAME}" 1>/dev/null || exit 1
 
-        if [ "${ENABLE_TIMESCALEDB}" == "true" ]; then
+        if [ "${ENABLE_TIMESCALEDB,,}" == "true" ]; then
             cat /usr/share/doc/zabbix-server-postgresql/timescaledb.sql | psql --quiet \
                 --host ${DB_SERVER_HOST} --port ${DB_SERVER_PORT} \
                 --username ${DB_SERVER_ZBX_USER} --dbname ${DB_SERVER_DBNAME} 1>/dev/null || exit 1
@@ -399,7 +399,7 @@ update_zbx_config() {
     update_config_var $ZBX_CONFIG "StartLLDProcessors" "${ZBX_STARTLLDPROCESSORS}"
 
     : ${ZBX_JAVAGATEWAY_ENABLE:="false"}
-    if [ "${ZBX_JAVAGATEWAY_ENABLE}" == "true" ]; then
+    if [ "${ZBX_JAVAGATEWAY_ENABLE,,}" == "true" ]; then
         update_config_var $ZBX_CONFIG "JavaGateway" "${ZBX_JAVAGATEWAY:-"zabbix-java-gateway"}"
         update_config_var $ZBX_CONFIG "JavaGatewayPort" "${ZBX_JAVAGATEWAYPORT}"
         update_config_var $ZBX_CONFIG "StartJavaPollers" "${ZBX_STARTJAVAPOLLERS:-"5"}"
@@ -416,7 +416,7 @@ update_zbx_config() {
     update_config_var $ZBX_CONFIG "VMwareTimeout" "${ZBX_VMWARETIMEOUT}"
 
     : ${ZBX_ENABLE_SNMP_TRAPS:="false"}
-    if [ "${ZBX_ENABLE_SNMP_TRAPS}" == "true" ]; then
+    if [ "${ZBX_ENABLE_SNMP_TRAPS,,}" == "true" ]; then
         update_config_var $ZBX_CONFIG "SNMPTrapperFile" "${ZABBIX_USER_HOME_DIR}/snmptraps/snmptraps.log"
         update_config_var $ZBX_CONFIG "StartSNMPTrapper" "1"
     else
diff --git a/server-pgsql/centos/docker-entrypoint.sh b/server-pgsql/centos/docker-entrypoint.sh
index 48c0e6914..d0ac418ec 100755
--- a/server-pgsql/centos/docker-entrypoint.sh
+++ b/server-pgsql/centos/docker-entrypoint.sh
@@ -5,12 +5,12 @@ set -o pipefail
 set +e
 
 # Script trace mode
-if [ "${DEBUG_MODE}" == "true" ]; then
+if [ "${DEBUG_MODE,,}" == "true" ]; then
     set -o xtrace
 fi
 
 #Enable PostgreSQL timescaleDB feature:
-ENABLE_TIMESCALEDB=${ENABLE_TIMESCALEDB:-"false"}
+: ${ENABLE_TIMESCALEDB:="false"}
 
 # Default directories
 # User 'zabbix' home directory
@@ -162,7 +162,7 @@ check_db_connect_postgresql() {
     echo "* DB_SERVER_PORT: ${DB_SERVER_PORT}"
     echo "* DB_SERVER_DBNAME: ${DB_SERVER_DBNAME}"
     echo "* DB_SERVER_SCHEMA: ${DB_SERVER_SCHEMA}"
-    if [ "${DEBUG_MODE}" == "true" ]; then
+    if [ "${DEBUG_MODE,,}" == "true" ]; then
         echo "* DB_SERVER_ZBX_USER: ${DB_SERVER_ZBX_USER}"
         echo "* DB_SERVER_ZBX_PASS: ${DB_SERVER_ZBX_PASS}"
     fi
@@ -288,7 +288,7 @@ create_db_schema_postgresql() {
     if [ -z "${ZBX_DB_VERSION}" ]; then
         echo "** Creating '${DB_SERVER_DBNAME}' schema in PostgreSQL"
 
-        if [ "${ENABLE_TIMESCALEDB}" == "true" ]; then
+        if [ "${ENABLE_TIMESCALEDB,,}" == "true" ]; then
             psql_query "CREATE EXTENSION IF NOT EXISTS timescaledb CASCADE;"
         fi
 
@@ -312,7 +312,7 @@ create_db_schema_postgresql() {
                 --host "${DB_SERVER_HOST}" --port "${DB_SERVER_PORT}" \
                 --username "${DB_SERVER_ZBX_USER}" --dbname "${DB_SERVER_DBNAME}" 1>/dev/null || exit 1
 
-        if [ "${ENABLE_TIMESCALEDB}" == "true" ]; then
+        if [ "${ENABLE_TIMESCALEDB,,}" == "true" ]; then
             cat /usr/share/doc/zabbix-server-postgresql/timescaledb.sql | psql --quiet \
                 --host ${DB_SERVER_HOST} --port ${DB_SERVER_PORT} \
                 --username ${DB_SERVER_ZBX_USER} --dbname ${DB_SERVER_DBNAME} 1>/dev/null || exit 1
@@ -399,7 +399,7 @@ update_zbx_config() {
     update_config_var $ZBX_CONFIG "StartLLDProcessors" "${ZBX_STARTLLDPROCESSORS}"
 
     : ${ZBX_JAVAGATEWAY_ENABLE:="false"}
-    if [ "${ZBX_JAVAGATEWAY_ENABLE}" == "true" ]; then
+    if [ "${ZBX_JAVAGATEWAY_ENABLE,,}" == "true" ]; then
         update_config_var $ZBX_CONFIG "JavaGateway" "${ZBX_JAVAGATEWAY:-"zabbix-java-gateway"}"
         update_config_var $ZBX_CONFIG "JavaGatewayPort" "${ZBX_JAVAGATEWAYPORT}"
         update_config_var $ZBX_CONFIG "StartJavaPollers" "${ZBX_STARTJAVAPOLLERS:-"5"}"
@@ -416,7 +416,7 @@ update_zbx_config() {
     update_config_var $ZBX_CONFIG "VMwareTimeout" "${ZBX_VMWARETIMEOUT}"
 
     : ${ZBX_ENABLE_SNMP_TRAPS:="false"}
-    if [ "${ZBX_ENABLE_SNMP_TRAPS}" == "true" ]; then
+    if [ "${ZBX_ENABLE_SNMP_TRAPS,,}" == "true" ]; then
         update_config_var $ZBX_CONFIG "SNMPTrapperFile" "${ZABBIX_USER_HOME_DIR}/snmptraps/snmptraps.log"
         update_config_var $ZBX_CONFIG "StartSNMPTrapper" "1"
     else
diff --git a/server-pgsql/ubuntu/docker-entrypoint.sh b/server-pgsql/ubuntu/docker-entrypoint.sh
index 19ba75386..c250ce68b 100755
--- a/server-pgsql/ubuntu/docker-entrypoint.sh
+++ b/server-pgsql/ubuntu/docker-entrypoint.sh
@@ -5,12 +5,12 @@ set -o pipefail
 set +e
 
 # Script trace mode
-if [ "${DEBUG_MODE}" == "true" ]; then
+if [ "${DEBUG_MODE,,}" == "true" ]; then
     set -o xtrace
 fi
 
 #Enable PostgreSQL timescaleDB feature:
-ENABLE_TIMESCALEDB=${ENABLE_TIMESCALEDB:-"false"}
+: ${ENABLE_TIMESCALEDB:="false"}
 
 # Default directories
 # User 'zabbix' home directory
@@ -162,7 +162,7 @@ check_db_connect_postgresql() {
     echo "* DB_SERVER_PORT: ${DB_SERVER_PORT}"
     echo "* DB_SERVER_DBNAME: ${DB_SERVER_DBNAME}"
     echo "* DB_SERVER_SCHEMA: ${DB_SERVER_SCHEMA}"
-    if [ "${DEBUG_MODE}" == "true" ]; then
+    if [ "${DEBUG_MODE,,}" == "true" ]; then
         echo "* DB_SERVER_ZBX_USER: ${DB_SERVER_ZBX_USER}"
         echo "* DB_SERVER_ZBX_PASS: ${DB_SERVER_ZBX_PASS}"
     fi
@@ -288,7 +288,7 @@ create_db_schema_postgresql() {
     if [ -z "${ZBX_DB_VERSION}" ]; then
         echo "** Creating '${DB_SERVER_DBNAME}' schema in PostgreSQL"
 
-        if [ "${ENABLE_TIMESCALEDB}" == "true" ]; then
+        if [ "${ENABLE_TIMESCALEDB,,}" == "true" ]; then
             psql_query "CREATE EXTENSION IF NOT EXISTS timescaledb CASCADE;"
         fi
 
@@ -312,7 +312,7 @@ create_db_schema_postgresql() {
                 --host "${DB_SERVER_HOST}" --port "${DB_SERVER_PORT}" \
                 --username "${DB_SERVER_ZBX_USER}" --dbname "${DB_SERVER_DBNAME}" 1>/dev/null || exit 1
 
-        if [ "${ENABLE_TIMESCALEDB}" == "true" ]; then
+        if [ "${ENABLE_TIMESCALEDB,,}" == "true" ]; then
             cat /usr/share/doc/zabbix-server-postgresql/timescaledb.sql | psql --quiet \
                 --host ${DB_SERVER_HOST} --port ${DB_SERVER_PORT} \
                 --username ${DB_SERVER_ZBX_USER} --dbname ${DB_SERVER_DBNAME} 1>/dev/null || exit 1
@@ -399,7 +399,7 @@ update_zbx_config() {
     update_config_var $ZBX_CONFIG "StartLLDProcessors" "${ZBX_STARTLLDPROCESSORS}"
 
     : ${ZBX_JAVAGATEWAY_ENABLE:="false"}
-    if [ "${ZBX_JAVAGATEWAY_ENABLE}" == "true" ]; then
+    if [ "${ZBX_JAVAGATEWAY_ENABLE,,}" == "true" ]; then
         update_config_var $ZBX_CONFIG "JavaGateway" "${ZBX_JAVAGATEWAY:-"zabbix-java-gateway"}"
         update_config_var $ZBX_CONFIG "JavaGatewayPort" "${ZBX_JAVAGATEWAYPORT}"
         update_config_var $ZBX_CONFIG "StartJavaPollers" "${ZBX_STARTJAVAPOLLERS:-"5"}"
@@ -416,7 +416,7 @@ update_zbx_config() {
     update_config_var $ZBX_CONFIG "VMwareTimeout" "${ZBX_VMWARETIMEOUT}"
 
     : ${ZBX_ENABLE_SNMP_TRAPS:="false"}
-    if [ "${ZBX_ENABLE_SNMP_TRAPS}" == "true" ]; then
+    if [ "${ZBX_ENABLE_SNMP_TRAPS,,}" == "true" ]; then
         update_config_var $ZBX_CONFIG "SNMPTrapperFile" "${ZABBIX_USER_HOME_DIR}/snmptraps/snmptraps.log"
         update_config_var $ZBX_CONFIG "StartSNMPTrapper" "1"
     else
diff --git a/snmptraps/alpine/README.md b/snmptraps/alpine/README.md
index 35e120ef6..471da9d1d 100644
--- a/snmptraps/alpine/README.md
+++ b/snmptraps/alpine/README.md
@@ -48,7 +48,7 @@ Where `some-zabbix-snmptraps` is the name you want to assign to your container a
 
 ## Linking Zabbix server or Zabbix proxy with the container
 
-    docker run --name some-zabbix-server --link some-zabbix-snmptraps:zabbix-snmptraps --volumes-from some-zabbix-snmptraps -p 162:1162/udp -d zabbix/zabbix-server:tag
+    docker run --name some-zabbix-server --link some-zabbix-snmptraps:zabbix-snmptraps --volumes-from some-zabbix-snmptraps -d zabbix/zabbix-server:tag
 
 ## Container shell access and viewing Zabbix snmptraps logs
 
diff --git a/snmptraps/centos/README.md b/snmptraps/centos/README.md
index 35e120ef6..471da9d1d 100644
--- a/snmptraps/centos/README.md
+++ b/snmptraps/centos/README.md
@@ -48,7 +48,7 @@ Where `some-zabbix-snmptraps` is the name you want to assign to your container a
 
 ## Linking Zabbix server or Zabbix proxy with the container
 
-    docker run --name some-zabbix-server --link some-zabbix-snmptraps:zabbix-snmptraps --volumes-from some-zabbix-snmptraps -p 162:1162/udp -d zabbix/zabbix-server:tag
+    docker run --name some-zabbix-server --link some-zabbix-snmptraps:zabbix-snmptraps --volumes-from some-zabbix-snmptraps -d zabbix/zabbix-server:tag
 
 ## Container shell access and viewing Zabbix snmptraps logs
 
diff --git a/snmptraps/ubuntu/README.md b/snmptraps/ubuntu/README.md
index 35e120ef6..471da9d1d 100644
--- a/snmptraps/ubuntu/README.md
+++ b/snmptraps/ubuntu/README.md
@@ -48,7 +48,7 @@ Where `some-zabbix-snmptraps` is the name you want to assign to your container a
 
 ## Linking Zabbix server or Zabbix proxy with the container
 
-    docker run --name some-zabbix-server --link some-zabbix-snmptraps:zabbix-snmptraps --volumes-from some-zabbix-snmptraps -p 162:1162/udp -d zabbix/zabbix-server:tag
+    docker run --name some-zabbix-server --link some-zabbix-snmptraps:zabbix-snmptraps --volumes-from some-zabbix-snmptraps -d zabbix/zabbix-server:tag
 
 ## Container shell access and viewing Zabbix snmptraps logs
 
diff --git a/web-apache-mysql/alpine/docker-entrypoint.sh b/web-apache-mysql/alpine/docker-entrypoint.sh
index 9176c0599..42b325f0f 100755
--- a/web-apache-mysql/alpine/docker-entrypoint.sh
+++ b/web-apache-mysql/alpine/docker-entrypoint.sh
@@ -5,7 +5,7 @@ set -o pipefail
 set +e
 
 # Script trace mode
-if [ "${DEBUG_MODE}" == "true" ]; then
+if [ "${DEBUG_MODE,,}" == "true" ]; then
     set -o xtrace
 fi
 
@@ -17,6 +17,9 @@ fi
 # Default Zabbix server port number
 : ${ZBX_SERVER_PORT:="10051"}
 
+# Default timezone for web interface
+: ${PHP_TZ:="Europe/Riga"}
+
 # Default directories
 # Configuration files directory
 ZABBIX_ETC_DIR="/etc/zabbix"
@@ -63,17 +66,17 @@ check_variables() {
     file_env MYSQL_USER
     file_env MYSQL_PASSWORD
 
-    if [ ! -n "${MYSQL_USER}" ] && [ "${MYSQL_RANDOM_ROOT_PASSWORD}" == "true" ]; then
+    if [ ! -n "${MYSQL_USER}" ] && [ "${MYSQL_RANDOM_ROOT_PASSWORD,,}" == "true" ]; then
         echo "**** Impossible to use MySQL server because of unknown Zabbix user and random 'root' password"
         exit 1
     fi
 
-    if [ ! -n "${MYSQL_USER}" ] && [ ! -n "${MYSQL_ROOT_PASSWORD}" ] && [ "${MYSQL_ALLOW_EMPTY_PASSWORD}" != "true" ]; then
+    if [ ! -n "${MYSQL_USER}" ] && [ ! -n "${MYSQL_ROOT_PASSWORD}" ] && [ "${MYSQL_ALLOW_EMPTY_PASSWORD,,}" != "true" ]; then
         echo "*** Impossible to use MySQL server because 'root' password is not defined and it is not empty"
         exit 1
     fi
 
-    if [ "${MYSQL_ALLOW_EMPTY_PASSWORD}" == "true" ] || [ -n "${MYSQL_ROOT_PASSWORD}" ]; then
+    if [ "${MYSQL_ALLOW_EMPTY_PASSWORD,,}" == "true" ] || [ -n "${MYSQL_ROOT_PASSWORD}" ]; then
         USE_DB_ROOT_USER=true
         DB_SERVER_ROOT_USER="root"
         DB_SERVER_ROOT_PASS=${MYSQL_ROOT_PASSWORD:-""}
@@ -83,7 +86,7 @@ check_variables() {
 
     # If root password is not specified use provided credentials
     : ${DB_SERVER_ROOT_USER:=${MYSQL_USER}}
-    [ "${MYSQL_ALLOW_EMPTY_PASSWORD}" == "true" ] || DB_SERVER_ROOT_PASS=${DB_SERVER_ROOT_PASS:-${MYSQL_PASSWORD}}
+    [ "${MYSQL_ALLOW_EMPTY_PASSWORD,,}" == "true" ] || DB_SERVER_ROOT_PASS=${DB_SERVER_ROOT_PASS:-${MYSQL_PASSWORD}}
     DB_SERVER_ZBX_USER=${MYSQL_USER:-"zabbix"}
     DB_SERVER_ZBX_PASS=${MYSQL_PASSWORD:-"zabbix"}
 
@@ -117,7 +120,7 @@ check_db_connect() {
     echo "* DB_SERVER_HOST: ${DB_SERVER_HOST}"
     echo "* DB_SERVER_PORT: ${DB_SERVER_PORT}"
     echo "* DB_SERVER_DBNAME: ${DB_SERVER_DBNAME}"
-    if [ "${DEBUG_MODE}" == "true" ]; then
+    if [ "${DEBUG_MODE,,}" == "true" ]; then
         if [ "${USE_DB_ROOT_USER}" == "true" ]; then
             echo "* DB_SERVER_ROOT_USER: ${DB_SERVER_ROOT_USER}"
             echo "* DB_SERVER_ROOT_PASS: ${DB_SERVER_ROOT_PASS}"
@@ -167,7 +170,8 @@ prepare_web_server() {
 prepare_zbx_web_config() {
     echo "** Preparing Zabbix frontend configuration file"
 
-    export ZBX_DENY_GUI_ACCESS=${ZBX_DENY_GUI_ACCESS:-"false"}
+    : ${ZBX_DENY_GUI_ACCESS:="false"}
+    export ZBX_DENY_GUI_ACCESS=${ZBX_DENY_GUI_ACCESS,,}
     export ZBX_GUI_ACCESS_IP_RANGE=${ZBX_GUI_ACCESS_IP_RANGE:-"['127.0.0.1']"}
     export ZBX_GUI_WARNING_MSG=${ZBX_GUI_WARNING_MSG:-"Zabbix is under maintenance."}
 
@@ -189,17 +193,20 @@ prepare_zbx_web_config() {
     export ZBX_SERVER_PORT=${ZBX_SERVER_PORT:-"10051"}
     export ZBX_SERVER_NAME=${ZBX_SERVER_NAME}
 
-    export ZBX_DB_ENCRYPTION=${ZBX_DB_ENCRYPTION:-"false"}
+    : ${ZBX_DB_ENCRYPTION:="false"}
+    export ZBX_DB_ENCRYPTION=${ZBX_DB_ENCRYPTION,,}
     export ZBX_DB_KEY_FILE=${ZBX_DB_KEY_FILE}
     export ZBX_DB_CERT_FILE=${ZBX_DB_CERT_FILE}
     export ZBX_DB_CA_FILE=${ZBX_DB_CA_FILE}
-    export ZBX_DB_VERIFY_HOST=${ZBX_DB_VERIFY_HOST-"false"}
+    : ${ZBX_DB_VERIFY_HOST="false"}
+    export ZBX_DB_VERIFY_HOST=${ZBX_DB_VERIFY_HOST,,}
 
     export ZBX_VAULTURL=${ZBX_VAULTURL}
     export ZBX_VAULTDBPATH=${ZBX_VAULTDBPATH}
     export VAULT_TOKEN=${VAULT_TOKEN}
 
-    export DB_DOUBLE_IEEE754=${DB_DOUBLE_IEEE754:-"true"}
+    : ${DB_DOUBLE_IEEE754:="true"}
+    export DB_DOUBLE_IEEE754=${DB_DOUBLE_IEEE754,,}
 
     export ZBX_HISTORYSTORAGEURL=${ZBX_HISTORYSTORAGEURL}
     export ZBX_HISTORYSTORAGETYPES=${ZBX_HISTORYSTORAGETYPES:-"[]"}
@@ -212,7 +219,9 @@ prepare_zbx_web_config() {
         rm -f "/tmp/defines.inc.php_tmp"
     fi
 
-    if [ "${ENABLE_WEB_ACCESS_LOG:-"true"}" == "false" ]; then
+    : ${ENABLE_WEB_ACCESS_LOG:="true"}
+
+    if [ "${ENABLE_WEB_ACCESS_LOG,,}" == "false" ]; then
         sed -ri \
             -e 's!^(\s*CustomLog)\s+\S+!\1 /dev/null!g' \
             "/etc/apache2/httpd.conf"
diff --git a/web-apache-mysql/centos/docker-entrypoint.sh b/web-apache-mysql/centos/docker-entrypoint.sh
index 2976cc8d8..ad515e169 100755
--- a/web-apache-mysql/centos/docker-entrypoint.sh
+++ b/web-apache-mysql/centos/docker-entrypoint.sh
@@ -5,7 +5,7 @@ set -o pipefail
 set +e
 
 # Script trace mode
-if [ "${DEBUG_MODE}" == "true" ]; then
+if [ "${DEBUG_MODE,,}" == "true" ]; then
     set -o xtrace
 fi
 
@@ -17,6 +17,9 @@ fi
 # Default Zabbix server port number
 : ${ZBX_SERVER_PORT:="10051"}
 
+# Default timezone for web interface
+: ${PHP_TZ:="Europe/Riga"}
+
 # Default directories
 # Configuration files directory
 ZABBIX_ETC_DIR="/etc/zabbix"
@@ -63,17 +66,17 @@ check_variables() {
     file_env MYSQL_USER
     file_env MYSQL_PASSWORD
 
-    if [ ! -n "${MYSQL_USER}" ] && [ "${MYSQL_RANDOM_ROOT_PASSWORD}" == "true" ]; then
+    if [ ! -n "${MYSQL_USER}" ] && [ "${MYSQL_RANDOM_ROOT_PASSWORD,,}" == "true" ]; then
         echo "**** Impossible to use MySQL server because of unknown Zabbix user and random 'root' password"
         exit 1
     fi
 
-    if [ ! -n "${MYSQL_USER}" ] && [ ! -n "${MYSQL_ROOT_PASSWORD}" ] && [ "${MYSQL_ALLOW_EMPTY_PASSWORD}" != "true" ]; then
+    if [ ! -n "${MYSQL_USER}" ] && [ ! -n "${MYSQL_ROOT_PASSWORD}" ] && [ "${MYSQL_ALLOW_EMPTY_PASSWORD,,}" != "true" ]; then
         echo "*** Impossible to use MySQL server because 'root' password is not defined and it is not empty"
         exit 1
     fi
 
-    if [ "${MYSQL_ALLOW_EMPTY_PASSWORD}" == "true" ] || [ -n "${MYSQL_ROOT_PASSWORD}" ]; then
+    if [ "${MYSQL_ALLOW_EMPTY_PASSWORD,,}" == "true" ] || [ -n "${MYSQL_ROOT_PASSWORD}" ]; then
         USE_DB_ROOT_USER=true
         DB_SERVER_ROOT_USER="root"
         DB_SERVER_ROOT_PASS=${MYSQL_ROOT_PASSWORD:-""}
@@ -83,7 +86,7 @@ check_variables() {
 
     # If root password is not specified use provided credentials
     : ${DB_SERVER_ROOT_USER:=${MYSQL_USER}}
-    [ "${MYSQL_ALLOW_EMPTY_PASSWORD}" == "true" ] || DB_SERVER_ROOT_PASS=${DB_SERVER_ROOT_PASS:-${MYSQL_PASSWORD}}
+    [ "${MYSQL_ALLOW_EMPTY_PASSWORD,,}" == "true" ] || DB_SERVER_ROOT_PASS=${DB_SERVER_ROOT_PASS:-${MYSQL_PASSWORD}}
     DB_SERVER_ZBX_USER=${MYSQL_USER:-"zabbix"}
     DB_SERVER_ZBX_PASS=${MYSQL_PASSWORD:-"zabbix"}
 
@@ -117,7 +120,7 @@ check_db_connect() {
     echo "* DB_SERVER_HOST: ${DB_SERVER_HOST}"
     echo "* DB_SERVER_PORT: ${DB_SERVER_PORT}"
     echo "* DB_SERVER_DBNAME: ${DB_SERVER_DBNAME}"
-    if [ "${DEBUG_MODE}" == "true" ]; then
+    if [ "${DEBUG_MODE,,}" == "true" ]; then
         if [ "${USE_DB_ROOT_USER}" == "true" ]; then
             echo "* DB_SERVER_ROOT_USER: ${DB_SERVER_ROOT_USER}"
             echo "* DB_SERVER_ROOT_PASS: ${DB_SERVER_ROOT_PASS}"
@@ -176,7 +179,8 @@ prepare_zbx_web_config() {
         echo "listen.group = nginx" >> "$PHP_CONFIG_FILE"
     fi
 
-    export ZBX_DENY_GUI_ACCESS=${ZBX_DENY_GUI_ACCESS:-"false"}
+    : ${ZBX_DENY_GUI_ACCESS:="false"}
+    export ZBX_DENY_GUI_ACCESS=${ZBX_DENY_GUI_ACCESS,,}
     export ZBX_GUI_ACCESS_IP_RANGE=${ZBX_GUI_ACCESS_IP_RANGE:-"['127.0.0.1']"}
     export ZBX_GUI_WARNING_MSG=${ZBX_GUI_WARNING_MSG:-"Zabbix is under maintenance."}
 
@@ -198,17 +202,20 @@ prepare_zbx_web_config() {
     export ZBX_SERVER_PORT=${ZBX_SERVER_PORT:-"10051"}
     export ZBX_SERVER_NAME=${ZBX_SERVER_NAME}
 
-    export ZBX_DB_ENCRYPTION=${ZBX_DB_ENCRYPTION:-"false"}
+    : ${ZBX_DB_ENCRYPTION:="false"}
+    export ZBX_DB_ENCRYPTION=${ZBX_DB_ENCRYPTION,,}
     export ZBX_DB_KEY_FILE=${ZBX_DB_KEY_FILE}
     export ZBX_DB_CERT_FILE=${ZBX_DB_CERT_FILE}
     export ZBX_DB_CA_FILE=${ZBX_DB_CA_FILE}
-    export ZBX_DB_VERIFY_HOST=${ZBX_DB_VERIFY_HOST-"false"}
+    : ${ZBX_DB_VERIFY_HOST="false"}
+    export ZBX_DB_VERIFY_HOST=${ZBX_DB_VERIFY_HOST,,}
 
     export ZBX_VAULTURL=${ZBX_VAULTURL}
     export ZBX_VAULTDBPATH=${ZBX_VAULTDBPATH}
     export VAULT_TOKEN=${VAULT_TOKEN}
 
-    export DB_DOUBLE_IEEE754=${DB_DOUBLE_IEEE754:-"true"}
+    : ${DB_DOUBLE_IEEE754:="true"}
+    export DB_DOUBLE_IEEE754=${DB_DOUBLE_IEEE754,,}
 
     export ZBX_HISTORYSTORAGEURL=${ZBX_HISTORYSTORAGEURL}
     export ZBX_HISTORYSTORAGETYPES=${ZBX_HISTORYSTORAGETYPES:-"[]"}
@@ -221,7 +228,9 @@ prepare_zbx_web_config() {
         rm -f "/tmp/defines.inc.php_tmp"
     fi
 
-    if [ "${ENABLE_WEB_ACCESS_LOG:-"true"}" == "false" ]; then
+    : ${ENABLE_WEB_ACCESS_LOG:="true"}
+
+    if [ "${ENABLE_WEB_ACCESS_LOG,,}" == "false" ]; then
         sed -ri \
             -e 's!^(\s*CustomLog)\s+\S+!\1 /dev/null!g' \
             "/etc/httpd/conf/httpd.conf"
diff --git a/web-apache-mysql/ubuntu/docker-entrypoint.sh b/web-apache-mysql/ubuntu/docker-entrypoint.sh
index f7fcae8d7..0a955ebb7 100755
--- a/web-apache-mysql/ubuntu/docker-entrypoint.sh
+++ b/web-apache-mysql/ubuntu/docker-entrypoint.sh
@@ -5,7 +5,7 @@ set -o pipefail
 set +e
 
 # Script trace mode
-if [ "${DEBUG_MODE}" == "true" ]; then
+if [ "${DEBUG_MODE,,}" == "true" ]; then
     set -o xtrace
 fi
 
@@ -17,6 +17,9 @@ fi
 # Default Zabbix server port number
 : ${ZBX_SERVER_PORT:="10051"}
 
+# Default timezone for web interface
+: ${PHP_TZ:="Europe/Riga"}
+
 # Default directories
 # Configuration files directory
 ZABBIX_ETC_DIR="/etc/zabbix"
@@ -63,17 +66,17 @@ check_variables() {
     file_env MYSQL_USER
     file_env MYSQL_PASSWORD
 
-    if [ ! -n "${MYSQL_USER}" ] && [ "${MYSQL_RANDOM_ROOT_PASSWORD}" == "true" ]; then
+    if [ ! -n "${MYSQL_USER}" ] && [ "${MYSQL_RANDOM_ROOT_PASSWORD,,}" == "true" ]; then
         echo "**** Impossible to use MySQL server because of unknown Zabbix user and random 'root' password"
         exit 1
     fi
 
-    if [ ! -n "${MYSQL_USER}" ] && [ ! -n "${MYSQL_ROOT_PASSWORD}" ] && [ "${MYSQL_ALLOW_EMPTY_PASSWORD}" != "true" ]; then
+    if [ ! -n "${MYSQL_USER}" ] && [ ! -n "${MYSQL_ROOT_PASSWORD}" ] && [ "${MYSQL_ALLOW_EMPTY_PASSWORD,,}" != "true" ]; then
         echo "*** Impossible to use MySQL server because 'root' password is not defined and it is not empty"
         exit 1
     fi
 
-    if [ "${MYSQL_ALLOW_EMPTY_PASSWORD}" == "true" ] || [ -n "${MYSQL_ROOT_PASSWORD}" ]; then
+    if [ "${MYSQL_ALLOW_EMPTY_PASSWORD,,}" == "true" ] || [ -n "${MYSQL_ROOT_PASSWORD}" ]; then
         USE_DB_ROOT_USER=true
         DB_SERVER_ROOT_USER="root"
         DB_SERVER_ROOT_PASS=${MYSQL_ROOT_PASSWORD:-""}
@@ -83,7 +86,7 @@ check_variables() {
 
     # If root password is not specified use provided credentials
     : ${DB_SERVER_ROOT_USER:=${MYSQL_USER}}
-    [ "${MYSQL_ALLOW_EMPTY_PASSWORD}" == "true" ] || DB_SERVER_ROOT_PASS=${DB_SERVER_ROOT_PASS:-${MYSQL_PASSWORD}}
+    [ "${MYSQL_ALLOW_EMPTY_PASSWORD,,}" == "true" ] || DB_SERVER_ROOT_PASS=${DB_SERVER_ROOT_PASS:-${MYSQL_PASSWORD}}
     DB_SERVER_ZBX_USER=${MYSQL_USER:-"zabbix"}
     DB_SERVER_ZBX_PASS=${MYSQL_PASSWORD:-"zabbix"}
 
@@ -117,7 +120,7 @@ check_db_connect() {
     echo "* DB_SERVER_HOST: ${DB_SERVER_HOST}"
     echo "* DB_SERVER_PORT: ${DB_SERVER_PORT}"
     echo "* DB_SERVER_DBNAME: ${DB_SERVER_DBNAME}"
-    if [ "${DEBUG_MODE}" == "true" ]; then
+    if [ "${DEBUG_MODE,,}" == "true" ]; then
         if [ "${USE_DB_ROOT_USER}" == "true" ]; then
             echo "* DB_SERVER_ROOT_USER: ${DB_SERVER_ROOT_USER}"
             echo "* DB_SERVER_ROOT_PASS: ${DB_SERVER_ROOT_PASS}"
@@ -167,7 +170,8 @@ prepare_web_server() {
 prepare_zbx_web_config() {
     echo "** Preparing Zabbix frontend configuration file"
 
-    export ZBX_DENY_GUI_ACCESS=${ZBX_DENY_GUI_ACCESS:-"false"}
+    : ${ZBX_DENY_GUI_ACCESS:="false"}
+    export ZBX_DENY_GUI_ACCESS=${ZBX_DENY_GUI_ACCESS,,}
     export ZBX_GUI_ACCESS_IP_RANGE=${ZBX_GUI_ACCESS_IP_RANGE:-"['127.0.0.1']"}
     export ZBX_GUI_WARNING_MSG=${ZBX_GUI_WARNING_MSG:-"Zabbix is under maintenance."}
 
@@ -189,17 +193,20 @@ prepare_zbx_web_config() {
     export ZBX_SERVER_PORT=${ZBX_SERVER_PORT:-"10051"}
     export ZBX_SERVER_NAME=${ZBX_SERVER_NAME}
 
-    export ZBX_DB_ENCRYPTION=${ZBX_DB_ENCRYPTION:-"false"}
+    : ${ZBX_DB_ENCRYPTION:="false"}
+    export ZBX_DB_ENCRYPTION=${ZBX_DB_ENCRYPTION,,}
     export ZBX_DB_KEY_FILE=${ZBX_DB_KEY_FILE}
     export ZBX_DB_CERT_FILE=${ZBX_DB_CERT_FILE}
     export ZBX_DB_CA_FILE=${ZBX_DB_CA_FILE}
-    export ZBX_DB_VERIFY_HOST=${ZBX_DB_VERIFY_HOST-"false"}
+    : ${ZBX_DB_VERIFY_HOST="false"}
+    export ZBX_DB_VERIFY_HOST=${ZBX_DB_VERIFY_HOST,,}
 
     export ZBX_VAULTURL=${ZBX_VAULTURL}
     export ZBX_VAULTDBPATH=${ZBX_VAULTDBPATH}
     export VAULT_TOKEN=${VAULT_TOKEN}
 
-    export DB_DOUBLE_IEEE754=${DB_DOUBLE_IEEE754:-"true"}
+    : ${DB_DOUBLE_IEEE754:="true"}
+    export DB_DOUBLE_IEEE754=${DB_DOUBLE_IEEE754,,}
 
     export ZBX_HISTORYSTORAGEURL=${ZBX_HISTORYSTORAGEURL}
     export ZBX_HISTORYSTORAGETYPES=${ZBX_HISTORYSTORAGETYPES:-"[]"}
@@ -212,7 +219,9 @@ prepare_zbx_web_config() {
         rm -f "/tmp/defines.inc.php_tmp"
     fi
 
-    if [ "${ENABLE_WEB_ACCESS_LOG:-"true"}" == "false" ]; then
+    : ${ENABLE_WEB_ACCESS_LOG:="true"}
+
+    if [ "${ENABLE_WEB_ACCESS_LOG,,}" == "false" ]; then
         sed -ri \
             -e 's!^(\s*CustomLog)\s+\S+!\1 /dev/null!g' \
             "/etc/apache2/apache2.conf"
diff --git a/web-apache-pgsql/alpine/docker-entrypoint.sh b/web-apache-pgsql/alpine/docker-entrypoint.sh
index fdaac5bb5..2b23f2026 100755
--- a/web-apache-pgsql/alpine/docker-entrypoint.sh
+++ b/web-apache-pgsql/alpine/docker-entrypoint.sh
@@ -5,7 +5,7 @@ set -o pipefail
 set +e
 
 # Script trace mode
-if [ "${DEBUG_MODE}" == "true" ]; then
+if [ "${DEBUG_MODE,,}" == "true" ]; then
     set -o xtrace
 fi
 
@@ -17,6 +17,9 @@ fi
 # Default Zabbix server port number
 : ${ZBX_SERVER_PORT:="10051"}
 
+# Default timezone for web interface
+: ${PHP_TZ:="Europe/Riga"}
+
 # Default directories
 # Configuration files directory
 ZABBIX_ETC_DIR="/etc/zabbix"
@@ -80,7 +83,7 @@ check_db_connect() {
     echo "* DB_SERVER_PORT: ${DB_SERVER_PORT}"
     echo "* DB_SERVER_DBNAME: ${DB_SERVER_DBNAME}"
     echo "* DB_SERVER_SCHEMA: ${DB_SERVER_SCHEMA}"
-    if [ "${DEBUG_MODE}" == "true" ]; then
+    if [ "${DEBUG_MODE,,}" == "true" ]; then
         if [ "${USE_DB_ROOT_USER}" == "true" ]; then
             echo "* DB_SERVER_ROOT_USER: ${DB_SERVER_ROOT_USER}"
             echo "* DB_SERVER_ROOT_PASS: ${DB_SERVER_ROOT_PASS}"
@@ -151,7 +154,8 @@ prepare_web_server() {
 prepare_zbx_web_config() {
     echo "** Preparing Zabbix frontend configuration file"
 
-    export ZBX_DENY_GUI_ACCESS=${ZBX_DENY_GUI_ACCESS:-"false"}
+    : ${ZBX_DENY_GUI_ACCESS:="false"}
+    export ZBX_DENY_GUI_ACCESS=${ZBX_DENY_GUI_ACCESS,,}
     export ZBX_GUI_ACCESS_IP_RANGE=${ZBX_GUI_ACCESS_IP_RANGE:-"['127.0.0.1']"}
     export ZBX_GUI_WARNING_MSG=${ZBX_GUI_WARNING_MSG:-"Zabbix is under maintenance."}
 
@@ -173,17 +177,20 @@ prepare_zbx_web_config() {
     export ZBX_SERVER_PORT=${ZBX_SERVER_PORT:-"10051"}
     export ZBX_SERVER_NAME=${ZBX_SERVER_NAME}
 
-    export ZBX_DB_ENCRYPTION=${ZBX_DB_ENCRYPTION:-"false"}
+    : ${ZBX_DB_ENCRYPTION:="false"}
+    export ZBX_DB_ENCRYPTION=${ZBX_DB_ENCRYPTION,,}
     export ZBX_DB_KEY_FILE=${ZBX_DB_KEY_FILE}
     export ZBX_DB_CERT_FILE=${ZBX_DB_CERT_FILE}
     export ZBX_DB_CA_FILE=${ZBX_DB_CA_FILE}
-    export ZBX_DB_VERIFY_HOST=${ZBX_DB_VERIFY_HOST-"false"}
+    : ${ZBX_DB_VERIFY_HOST:="false"}
+    export ZBX_DB_VERIFY_HOST=${ZBX_DB_VERIFY_HOST,,}
 
     export ZBX_VAULTURL=${ZBX_VAULTURL}
     export ZBX_VAULTDBPATH=${ZBX_VAULTDBPATH}
     export VAULT_TOKEN=${VAULT_TOKEN}
 
-    export DB_DOUBLE_IEEE754=${DB_DOUBLE_IEEE754:-"true"}
+    : ${DB_DOUBLE_IEEE754:="true"}
+    export DB_DOUBLE_IEEE754=${DB_DOUBLE_IEEE754,,}
 
     export ZBX_HISTORYSTORAGEURL=${ZBX_HISTORYSTORAGEURL}
     export ZBX_HISTORYSTORAGETYPES=${ZBX_HISTORYSTORAGETYPES:-"[]"}
@@ -196,7 +203,9 @@ prepare_zbx_web_config() {
         rm -f "/tmp/defines.inc.php_tmp"
     fi
 
-    if [ "${ENABLE_WEB_ACCESS_LOG:-"true"}" == "false" ]; then
+    : ${ENABLE_WEB_ACCESS_LOG:="true"}
+
+    if [ "${ENABLE_WEB_ACCESS_LOG,,}" == "false" ]; then
         sed -ri \
             -e 's!^(\s*CustomLog)\s+\S+!\1 /dev/null!g' \
             "/etc/apache2/httpd.conf"
diff --git a/web-apache-pgsql/centos/docker-entrypoint.sh b/web-apache-pgsql/centos/docker-entrypoint.sh
index 72fadfca2..5e7807e4d 100755
--- a/web-apache-pgsql/centos/docker-entrypoint.sh
+++ b/web-apache-pgsql/centos/docker-entrypoint.sh
@@ -5,7 +5,7 @@ set -o pipefail
 set +e
 
 # Script trace mode
-if [ "${DEBUG_MODE}" == "true" ]; then
+if [ "${DEBUG_MODE,,}" == "true" ]; then
     set -o xtrace
 fi
 
@@ -17,8 +17,8 @@ fi
 # Default Zabbix server port number
 : ${ZBX_SERVER_PORT:="10051"}
 
-#Enable PostgreSQL timescaleDB feature:
-ENABLE_TIMESCALEDB=${ENABLE_TIMESCALEDB:-"false"}
+# Default timezone for web interface
+: ${PHP_TZ:="Europe/Riga"}
 
 # Default directories
 # Configuration files directory
@@ -83,7 +83,7 @@ check_db_connect() {
     echo "* DB_SERVER_PORT: ${DB_SERVER_PORT}"
     echo "* DB_SERVER_DBNAME: ${DB_SERVER_DBNAME}"
     echo "* DB_SERVER_SCHEMA: ${DB_SERVER_SCHEMA}"
-    if [ "${DEBUG_MODE}" == "true" ]; then
+    if [ "${DEBUG_MODE,,}" == "true" ]; then
         if [ "${USE_DB_ROOT_USER}" == "true" ]; then
             echo "* DB_SERVER_ROOT_USER: ${DB_SERVER_ROOT_USER}"
             echo "* DB_SERVER_ROOT_PASS: ${DB_SERVER_ROOT_PASS}"
@@ -163,7 +163,8 @@ prepare_zbx_web_config() {
         echo "listen.group = nginx" >> "$PHP_CONFIG_FILE"
     fi
 
-    export ZBX_DENY_GUI_ACCESS=${ZBX_DENY_GUI_ACCESS:-"false"}
+    : ${ZBX_DENY_GUI_ACCESS:="false"}
+    export ZBX_DENY_GUI_ACCESS=${ZBX_DENY_GUI_ACCESS,,}
     export ZBX_GUI_ACCESS_IP_RANGE=${ZBX_GUI_ACCESS_IP_RANGE:-"['127.0.0.1']"}
     export ZBX_GUI_WARNING_MSG=${ZBX_GUI_WARNING_MSG:-"Zabbix is under maintenance."}
 
@@ -185,17 +186,20 @@ prepare_zbx_web_config() {
     export ZBX_SERVER_PORT=${ZBX_SERVER_PORT:-"10051"}
     export ZBX_SERVER_NAME=${ZBX_SERVER_NAME}
 
-    export ZBX_DB_ENCRYPTION=${ZBX_DB_ENCRYPTION:-"false"}
+    : ${ZBX_DB_ENCRYPTION:="false"}
+    export ZBX_DB_ENCRYPTION=${ZBX_DB_ENCRYPTION,,}
     export ZBX_DB_KEY_FILE=${ZBX_DB_KEY_FILE}
     export ZBX_DB_CERT_FILE=${ZBX_DB_CERT_FILE}
     export ZBX_DB_CA_FILE=${ZBX_DB_CA_FILE}
-    export ZBX_DB_VERIFY_HOST=${ZBX_DB_VERIFY_HOST-"false"}
+    : ${ZBX_DB_VERIFY_HOST:="false"}
+    export ZBX_DB_VERIFY_HOST=${ZBX_DB_VERIFY_HOST,,}
 
     export ZBX_VAULTURL=${ZBX_VAULTURL}
     export ZBX_VAULTDBPATH=${ZBX_VAULTDBPATH}
     export VAULT_TOKEN=${VAULT_TOKEN}
 
-    export DB_DOUBLE_IEEE754=${DB_DOUBLE_IEEE754:-"true"}
+    : ${DB_DOUBLE_IEEE754:="true"}
+    export DB_DOUBLE_IEEE754=${DB_DOUBLE_IEEE754,,}
 
     export ZBX_HISTORYSTORAGEURL=${ZBX_HISTORYSTORAGEURL}
     export ZBX_HISTORYSTORAGETYPES=${ZBX_HISTORYSTORAGETYPES:-"[]"}
@@ -208,7 +212,9 @@ prepare_zbx_web_config() {
         rm -f "/tmp/defines.inc.php_tmp"
     fi
 
-    if [ "${ENABLE_WEB_ACCESS_LOG:-"true"}" == "false" ]; then
+    : ${ENABLE_WEB_ACCESS_LOG:="true"}
+
+    if [ "${ENABLE_WEB_ACCESS_LOG,,}" == "false" ]; then
         sed -ri \
             -e 's!^(\s*CustomLog)\s+\S+!\1 /dev/null!g' \
             "/etc/httpd/conf/httpd.conf"
diff --git a/web-apache-pgsql/ubuntu/docker-entrypoint.sh b/web-apache-pgsql/ubuntu/docker-entrypoint.sh
index 9b6d7bec1..cb8e9cb4c 100755
--- a/web-apache-pgsql/ubuntu/docker-entrypoint.sh
+++ b/web-apache-pgsql/ubuntu/docker-entrypoint.sh
@@ -5,7 +5,7 @@ set -o pipefail
 set +e
 
 # Script trace mode
-if [ "${DEBUG_MODE}" == "true" ]; then
+if [ "${DEBUG_MODE,,}" == "true" ]; then
     set -o xtrace
 fi
 
@@ -17,8 +17,8 @@ fi
 # Default Zabbix server port number
 : ${ZBX_SERVER_PORT:="10051"}
 
-#Enable PostgreSQL timescaleDB feature:
-ENABLE_TIMESCALEDB=${ENABLE_TIMESCALEDB:-"false"}
+# Default timezone for web interface
+: ${PHP_TZ:="Europe/Riga"}
 
 # Default directories
 # Configuration files directory
@@ -83,7 +83,7 @@ check_db_connect() {
     echo "* DB_SERVER_PORT: ${DB_SERVER_PORT}"
     echo "* DB_SERVER_DBNAME: ${DB_SERVER_DBNAME}"
     echo "* DB_SERVER_SCHEMA: ${DB_SERVER_SCHEMA}"
-    if [ "${DEBUG_MODE}" == "true" ]; then
+    if [ "${DEBUG_MODE,,}" == "true" ]; then
         if [ "${USE_DB_ROOT_USER}" == "true" ]; then
             echo "* DB_SERVER_ROOT_USER: ${DB_SERVER_ROOT_USER}"
             echo "* DB_SERVER_ROOT_PASS: ${DB_SERVER_ROOT_PASS}"
@@ -158,7 +158,8 @@ clear_deploy() {
 prepare_zbx_web_config() {
     echo "** Preparing Zabbix frontend configuration file"
 
-    export ZBX_DENY_GUI_ACCESS=${ZBX_DENY_GUI_ACCESS:-"false"}
+    : ${ZBX_DENY_GUI_ACCESS:="false"}
+    export ZBX_DENY_GUI_ACCESS=${ZBX_DENY_GUI_ACCESS,,}
     export ZBX_GUI_ACCESS_IP_RANGE=${ZBX_GUI_ACCESS_IP_RANGE:-"['127.0.0.1']"}
     export ZBX_GUI_WARNING_MSG=${ZBX_GUI_WARNING_MSG:-"Zabbix is under maintenance."}
 
@@ -180,17 +181,20 @@ prepare_zbx_web_config() {
     export ZBX_SERVER_PORT=${ZBX_SERVER_PORT:-"10051"}
     export ZBX_SERVER_NAME=${ZBX_SERVER_NAME}
 
-    export ZBX_DB_ENCRYPTION=${ZBX_DB_ENCRYPTION:-"false"}
+    : ${ZBX_DB_ENCRYPTION:="false"}
+    export ZBX_DB_ENCRYPTION=${ZBX_DB_ENCRYPTION,,}
     export ZBX_DB_KEY_FILE=${ZBX_DB_KEY_FILE}
     export ZBX_DB_CERT_FILE=${ZBX_DB_CERT_FILE}
     export ZBX_DB_CA_FILE=${ZBX_DB_CA_FILE}
-    export ZBX_DB_VERIFY_HOST=${ZBX_DB_VERIFY_HOST-"false"}
+    : ${ZBX_DB_VERIFY_HOST:="false"}
+    export ZBX_DB_VERIFY_HOST=${ZBX_DB_VERIFY_HOST,,}
 
     export ZBX_VAULTURL=${ZBX_VAULTURL}
     export ZBX_VAULTDBPATH=${ZBX_VAULTDBPATH}
     export VAULT_TOKEN=${VAULT_TOKEN}
 
-    export DB_DOUBLE_IEEE754=${DB_DOUBLE_IEEE754:-"true"}
+    : ${DB_DOUBLE_IEEE754:="true"}
+    export DB_DOUBLE_IEEE754=${DB_DOUBLE_IEEE754,,}
 
     export ZBX_HISTORYSTORAGEURL=${ZBX_HISTORYSTORAGEURL}
     export ZBX_HISTORYSTORAGETYPES=${ZBX_HISTORYSTORAGETYPES:-"[]"}
@@ -203,7 +207,9 @@ prepare_zbx_web_config() {
         rm -f "/tmp/defines.inc.php_tmp"
     fi
 
-    if [ "${ENABLE_WEB_ACCESS_LOG:-"true"}" == "false" ]; then
+    : ${ENABLE_WEB_ACCESS_LOG:="true"}
+
+    if [ "${ENABLE_WEB_ACCESS_LOG,,}" == "false" ]; then
         sed -ri \
             -e 's!^(\s*CustomLog)\s+\S+!\1 /dev/null!g' \
             "/etc/apache2/apache2.conf"
diff --git a/web-nginx-mysql/alpine/docker-entrypoint.sh b/web-nginx-mysql/alpine/docker-entrypoint.sh
index a08f0a8ee..e2feddbf1 100755
--- a/web-nginx-mysql/alpine/docker-entrypoint.sh
+++ b/web-nginx-mysql/alpine/docker-entrypoint.sh
@@ -5,7 +5,7 @@ set -o pipefail
 set +e
 
 # Script trace mode
-if [ "${DEBUG_MODE}" == "true" ]; then
+if [ "${DEBUG_MODE,,}" == "true" ]; then
     set -o xtrace
 fi
 
@@ -66,17 +66,17 @@ check_variables() {
     file_env MYSQL_USER
     file_env MYSQL_PASSWORD
 
-    if [ ! -n "${MYSQL_USER}" ] && [ "${MYSQL_RANDOM_ROOT_PASSWORD}" == "true" ]; then
+    if [ ! -n "${MYSQL_USER}" ] && [ "${MYSQL_RANDOM_ROOT_PASSWORD,,}" == "true" ]; then
         echo "**** Impossible to use MySQL server because of unknown Zabbix user and random 'root' password"
         exit 1
     fi
 
-    if [ ! -n "${MYSQL_USER}" ] && [ ! -n "${MYSQL_ROOT_PASSWORD}" ] && [ "${MYSQL_ALLOW_EMPTY_PASSWORD}" != "true" ]; then
+    if [ ! -n "${MYSQL_USER}" ] && [ ! -n "${MYSQL_ROOT_PASSWORD}" ] && [ "${MYSQL_ALLOW_EMPTY_PASSWORD,,}" != "true" ]; then
         echo "*** Impossible to use MySQL server because 'root' password is not defined and it is not empty"
         exit 1
     fi
 
-    if [ "${MYSQL_ALLOW_EMPTY_PASSWORD}" == "true" ] || [ -n "${MYSQL_ROOT_PASSWORD}" ]; then
+    if [ "${MYSQL_ALLOW_EMPTY_PASSWORD,,}" == "true" ] || [ -n "${MYSQL_ROOT_PASSWORD}" ]; then
         USE_DB_ROOT_USER=true
         DB_SERVER_ROOT_USER="root"
         DB_SERVER_ROOT_PASS=${MYSQL_ROOT_PASSWORD:-""}
@@ -86,7 +86,7 @@ check_variables() {
 
     # If root password is not specified use provided credentials
     : ${DB_SERVER_ROOT_USER:=${MYSQL_USER}}
-    [ "${MYSQL_ALLOW_EMPTY_PASSWORD}" == "true" ] || DB_SERVER_ROOT_PASS=${DB_SERVER_ROOT_PASS:-${MYSQL_PASSWORD}}
+    [ "${MYSQL_ALLOW_EMPTY_PASSWORD,,}" == "true" ] || DB_SERVER_ROOT_PASS=${DB_SERVER_ROOT_PASS:-${MYSQL_PASSWORD}}
     DB_SERVER_ZBX_USER=${MYSQL_USER:-"zabbix"}
     DB_SERVER_ZBX_PASS=${MYSQL_PASSWORD:-"zabbix"}
 
@@ -96,7 +96,7 @@ check_variables() {
 db_tls_params() {
     local result=""
 
-    if [ "${ZBX_DB_ENCRYPTION}" == "true" ]; then
+    if [ "${ZBX_DB_ENCRYPTION,,}" == "true" ]; then
         result="--ssl"
 
         if [ -n "${ZBX_DB_CA_FILE}" ]; then
@@ -120,7 +120,7 @@ check_db_connect() {
     echo "* DB_SERVER_HOST: ${DB_SERVER_HOST}"
     echo "* DB_SERVER_PORT: ${DB_SERVER_PORT}"
     echo "* DB_SERVER_DBNAME: ${DB_SERVER_DBNAME}"
-    if [ "${DEBUG_MODE}" == "true" ]; then
+    if [ "${DEBUG_MODE,,}" == "true" ]; then
         if [ "${USE_DB_ROOT_USER}" == "true" ]; then
             echo "* DB_SERVER_ROOT_USER: ${DB_SERVER_ROOT_USER}"
             echo "* DB_SERVER_ROOT_PASS: ${DB_SERVER_ROOT_PASS}"
@@ -180,7 +180,8 @@ prepare_zbx_web_config() {
         echo "listen.group = nginx" >> "$PHP_CONFIG_FILE"
     fi
 
-    export ZBX_DENY_GUI_ACCESS=${ZBX_DENY_GUI_ACCESS:-"false"}
+    : ${ZBX_DENY_GUI_ACCESS:="false"}
+    export ZBX_DENY_GUI_ACCESS=${ZBX_DENY_GUI_ACCESS,,}
     export ZBX_GUI_ACCESS_IP_RANGE=${ZBX_GUI_ACCESS_IP_RANGE:-"['127.0.0.1']"}
     export ZBX_GUI_WARNING_MSG=${ZBX_GUI_WARNING_MSG:-"Zabbix is under maintenance."}
 
@@ -202,17 +203,20 @@ prepare_zbx_web_config() {
     export ZBX_SERVER_PORT=${ZBX_SERVER_PORT:-"10051"}
     export ZBX_SERVER_NAME=${ZBX_SERVER_NAME}
 
-    export ZBX_DB_ENCRYPTION=${ZBX_DB_ENCRYPTION:-"false"}
+    : ${ZBX_DB_ENCRYPTION:="false"}
+    export ZBX_DB_ENCRYPTION=${ZBX_DB_ENCRYPTION,,}
     export ZBX_DB_KEY_FILE=${ZBX_DB_KEY_FILE}
     export ZBX_DB_CERT_FILE=${ZBX_DB_CERT_FILE}
     export ZBX_DB_CA_FILE=${ZBX_DB_CA_FILE}
-    export ZBX_DB_VERIFY_HOST=${ZBX_DB_VERIFY_HOST-"false"}
-
+    : ${ZBX_DB_VERIFY_HOST:="false"}
+    export ZBX_DB_VERIFY_HOST=${ZBX_DB_VERIFY_HOST,,}
+    
     export ZBX_VAULTURL=${ZBX_VAULTURL}
     export ZBX_VAULTDBPATH=${ZBX_VAULTDBPATH}
     export VAULT_TOKEN=${VAULT_TOKEN}
-
-    export DB_DOUBLE_IEEE754=${DB_DOUBLE_IEEE754:-"true"}
+    
+    : ${DB_DOUBLE_IEEE754:="true"}
+    export DB_DOUBLE_IEEE754=${DB_DOUBLE_IEEE754,,}
 
     export ZBX_HISTORYSTORAGEURL=${ZBX_HISTORYSTORAGEURL}
     export ZBX_HISTORYSTORAGETYPES=${ZBX_HISTORYSTORAGETYPES:-"[]"}
@@ -236,7 +240,9 @@ prepare_zbx_web_config() {
         "$ZABBIX_ETC_DIR/nginx_ssl.conf"
     fi
 
-    if [ "${ENABLE_WEB_ACCESS_LOG:-"true"}" == "false" ]; then
+    : ${ENABLE_WEB_ACCESS_LOG:="true"}
+
+    if [ "${ENABLE_WEB_ACCESS_LOG,,}" == "false" ]; then
         sed -ri \
             -e 's!^(\s*access_log).+\;!\1 off\;!g' \
             "/etc/nginx/nginx.conf"
diff --git a/web-nginx-mysql/centos/docker-entrypoint.sh b/web-nginx-mysql/centos/docker-entrypoint.sh
index a65b943a6..3d50dbf75 100755
--- a/web-nginx-mysql/centos/docker-entrypoint.sh
+++ b/web-nginx-mysql/centos/docker-entrypoint.sh
@@ -5,7 +5,7 @@ set -o pipefail
 set +e
 
 # Script trace mode
-if [ "${DEBUG_MODE}" == "true" ]; then
+if [ "${DEBUG_MODE,,}" == "true" ]; then
     set -o xtrace
 fi
 
@@ -66,17 +66,17 @@ check_variables() {
     file_env MYSQL_USER
     file_env MYSQL_PASSWORD
 
-    if [ ! -n "${MYSQL_USER}" ] && [ "${MYSQL_RANDOM_ROOT_PASSWORD}" == "true" ]; then
+    if [ ! -n "${MYSQL_USER}" ] && [ "${MYSQL_RANDOM_ROOT_PASSWORD,,}" == "true" ]; then
         echo "**** Impossible to use MySQL server because of unknown Zabbix user and random 'root' password"
         exit 1
     fi
 
-    if [ ! -n "${MYSQL_USER}" ] && [ ! -n "${MYSQL_ROOT_PASSWORD}" ] && [ "${MYSQL_ALLOW_EMPTY_PASSWORD}" != "true" ]; then
+    if [ ! -n "${MYSQL_USER}" ] && [ ! -n "${MYSQL_ROOT_PASSWORD}" ] && [ "${MYSQL_ALLOW_EMPTY_PASSWORD,,}" != "true" ]; then
         echo "*** Impossible to use MySQL server because 'root' password is not defined and it is not empty"
         exit 1
     fi
 
-    if [ "${MYSQL_ALLOW_EMPTY_PASSWORD}" == "true" ] || [ -n "${MYSQL_ROOT_PASSWORD}" ]; then
+    if [ "${MYSQL_ALLOW_EMPTY_PASSWORD,,}" == "true" ] || [ -n "${MYSQL_ROOT_PASSWORD}" ]; then
         USE_DB_ROOT_USER=true
         DB_SERVER_ROOT_USER="root"
         DB_SERVER_ROOT_PASS=${MYSQL_ROOT_PASSWORD:-""}
@@ -86,7 +86,7 @@ check_variables() {
 
     # If root password is not specified use provided credentials
     : ${DB_SERVER_ROOT_USER:=${MYSQL_USER}}
-    [ "${MYSQL_ALLOW_EMPTY_PASSWORD}" == "true" ] || DB_SERVER_ROOT_PASS=${DB_SERVER_ROOT_PASS:-${MYSQL_PASSWORD}}
+    [ "${MYSQL_ALLOW_EMPTY_PASSWORD,,}" == "true" ] || DB_SERVER_ROOT_PASS=${DB_SERVER_ROOT_PASS:-${MYSQL_PASSWORD}}
     DB_SERVER_ZBX_USER=${MYSQL_USER:-"zabbix"}
     DB_SERVER_ZBX_PASS=${MYSQL_PASSWORD:-"zabbix"}
 
@@ -96,7 +96,7 @@ check_variables() {
 db_tls_params() {
     local result=""
 
-    if [ "${ZBX_DB_ENCRYPTION}" == "true" ]; then
+    if [ "${ZBX_DB_ENCRYPTION,,}" == "true" ]; then
         result="--ssl-mode=required"
 
         if [ -n "${ZBX_DB_CA_FILE}" ]; then
@@ -120,7 +120,7 @@ check_db_connect() {
     echo "* DB_SERVER_HOST: ${DB_SERVER_HOST}"
     echo "* DB_SERVER_PORT: ${DB_SERVER_PORT}"
     echo "* DB_SERVER_DBNAME: ${DB_SERVER_DBNAME}"
-    if [ "${DEBUG_MODE}" == "true" ]; then
+    if [ "${DEBUG_MODE,,}" == "true" ]; then
         if [ "${USE_DB_ROOT_USER}" == "true" ]; then
             echo "* DB_SERVER_ROOT_USER: ${DB_SERVER_ROOT_USER}"
             echo "* DB_SERVER_ROOT_PASS: ${DB_SERVER_ROOT_PASS}"
@@ -180,7 +180,8 @@ prepare_zbx_web_config() {
         echo "listen.group = nginx" >> "$PHP_CONFIG_FILE"
     fi
 
-    export ZBX_DENY_GUI_ACCESS=${ZBX_DENY_GUI_ACCESS:-"false"}
+    : ${ZBX_DENY_GUI_ACCESS:="false"}
+    export ZBX_DENY_GUI_ACCESS=${ZBX_DENY_GUI_ACCESS,,}
     export ZBX_GUI_ACCESS_IP_RANGE=${ZBX_GUI_ACCESS_IP_RANGE:-"['127.0.0.1']"}
     export ZBX_GUI_WARNING_MSG=${ZBX_GUI_WARNING_MSG:-"Zabbix is under maintenance."}
 
@@ -202,17 +203,20 @@ prepare_zbx_web_config() {
     export ZBX_SERVER_PORT=${ZBX_SERVER_PORT:-"10051"}
     export ZBX_SERVER_NAME=${ZBX_SERVER_NAME}
 
-    export ZBX_DB_ENCRYPTION=${ZBX_DB_ENCRYPTION:-"false"}
+    : ${ZBX_DB_ENCRYPTION:="false"}
+    export ZBX_DB_ENCRYPTION=${ZBX_DB_ENCRYPTION,,}
     export ZBX_DB_KEY_FILE=${ZBX_DB_KEY_FILE}
     export ZBX_DB_CERT_FILE=${ZBX_DB_CERT_FILE}
     export ZBX_DB_CA_FILE=${ZBX_DB_CA_FILE}
-    export ZBX_DB_VERIFY_HOST=${ZBX_DB_VERIFY_HOST-"false"}
+    : ${ZBX_DB_VERIFY_HOST:="false"}
+    export ZBX_DB_VERIFY_HOST=${ZBX_DB_VERIFY_HOST,,}
 
     export ZBX_VAULTURL=${ZBX_VAULTURL}
     export ZBX_VAULTDBPATH=${ZBX_VAULTDBPATH}
     export VAULT_TOKEN=${VAULT_TOKEN}
 
-    export DB_DOUBLE_IEEE754=${DB_DOUBLE_IEEE754:-"true"}
+    : ${DB_DOUBLE_IEEE754:="true"}
+    export DB_DOUBLE_IEEE754=${DB_DOUBLE_IEEE754,,}
 
     export ZBX_HISTORYSTORAGEURL=${ZBX_HISTORYSTORAGEURL}
     export ZBX_HISTORYSTORAGETYPES=${ZBX_HISTORYSTORAGETYPES:-"[]"}
@@ -236,7 +240,9 @@ prepare_zbx_web_config() {
         "$ZABBIX_ETC_DIR/nginx_ssl.conf"
     fi
 
-    if [ "${ENABLE_WEB_ACCESS_LOG:-"true"}" == "false" ]; then
+    : ${ENABLE_WEB_ACCESS_LOG:="true"}
+
+    if [ "${ENABLE_WEB_ACCESS_LOG,,}" == "false" ]; then
         sed -ri \
             -e 's!^(\s*access_log).+\;!\1 off\;!g' \
             "/etc/nginx/nginx.conf"
diff --git a/web-nginx-mysql/ubuntu/docker-entrypoint.sh b/web-nginx-mysql/ubuntu/docker-entrypoint.sh
index 73fa558ae..6c5e1b7b1 100755
--- a/web-nginx-mysql/ubuntu/docker-entrypoint.sh
+++ b/web-nginx-mysql/ubuntu/docker-entrypoint.sh
@@ -5,7 +5,7 @@ set -o pipefail
 set +e
 
 # Script trace mode
-if [ "${DEBUG_MODE}" == "true" ]; then
+if [ "${DEBUG_MODE,,}" == "true" ]; then
     set -o xtrace
 fi
 
@@ -66,17 +66,17 @@ check_variables() {
     file_env MYSQL_USER
     file_env MYSQL_PASSWORD
 
-    if [ ! -n "${MYSQL_USER}" ] && [ "${MYSQL_RANDOM_ROOT_PASSWORD}" == "true" ]; then
+    if [ ! -n "${MYSQL_USER}" ] && [ "${MYSQL_RANDOM_ROOT_PASSWORD,,}" == "true" ]; then
         echo "**** Impossible to use MySQL server because of unknown Zabbix user and random 'root' password"
         exit 1
     fi
 
-    if [ ! -n "${MYSQL_USER}" ] && [ ! -n "${MYSQL_ROOT_PASSWORD}" ] && [ "${MYSQL_ALLOW_EMPTY_PASSWORD}" != "true" ]; then
+    if [ ! -n "${MYSQL_USER}" ] && [ ! -n "${MYSQL_ROOT_PASSWORD}" ] && [ "${MYSQL_ALLOW_EMPTY_PASSWORD,,}" != "true" ]; then
         echo "*** Impossible to use MySQL server because 'root' password is not defined and it is not empty"
         exit 1
     fi
 
-    if [ "${MYSQL_ALLOW_EMPTY_PASSWORD}" == "true" ] || [ -n "${MYSQL_ROOT_PASSWORD}" ]; then
+    if [ "${MYSQL_ALLOW_EMPTY_PASSWORD,,}" == "true" ] || [ -n "${MYSQL_ROOT_PASSWORD}" ]; then
         USE_DB_ROOT_USER=true
         DB_SERVER_ROOT_USER="root"
         DB_SERVER_ROOT_PASS=${MYSQL_ROOT_PASSWORD:-""}
@@ -86,7 +86,7 @@ check_variables() {
 
     # If root password is not specified use provided credentials
     : ${DB_SERVER_ROOT_USER:=${MYSQL_USER}}
-    [ "${MYSQL_ALLOW_EMPTY_PASSWORD}" == "true" ] || DB_SERVER_ROOT_PASS=${DB_SERVER_ROOT_PASS:-${MYSQL_PASSWORD}}
+    [ "${MYSQL_ALLOW_EMPTY_PASSWORD,,}" == "true" ] || DB_SERVER_ROOT_PASS=${DB_SERVER_ROOT_PASS:-${MYSQL_PASSWORD}}
     DB_SERVER_ZBX_USER=${MYSQL_USER:-"zabbix"}
     DB_SERVER_ZBX_PASS=${MYSQL_PASSWORD:-"zabbix"}
 
@@ -96,7 +96,7 @@ check_variables() {
 db_tls_params() {
     local result=""
 
-    if [ "${ZBX_DB_ENCRYPTION}" == "true" ]; then
+    if [ "${ZBX_DB_ENCRYPTION,,}" == "true" ]; then
         result="--ssl-mode=required"
 
         if [ -n "${ZBX_DB_CA_FILE}" ]; then
@@ -120,7 +120,7 @@ check_db_connect() {
     echo "* DB_SERVER_HOST: ${DB_SERVER_HOST}"
     echo "* DB_SERVER_PORT: ${DB_SERVER_PORT}"
     echo "* DB_SERVER_DBNAME: ${DB_SERVER_DBNAME}"
-    if [ "${DEBUG_MODE}" == "true" ]; then
+    if [ "${DEBUG_MODE,,}" == "true" ]; then
         if [ "${USE_DB_ROOT_USER}" == "true" ]; then
             echo "* DB_SERVER_ROOT_USER: ${DB_SERVER_ROOT_USER}"
             echo "* DB_SERVER_ROOT_PASS: ${DB_SERVER_ROOT_PASS}"
@@ -180,7 +180,8 @@ prepare_zbx_web_config() {
         echo "listen.group = nginx" >> "$PHP_CONFIG_FILE"
     fi
 
-    export ZBX_DENY_GUI_ACCESS=${ZBX_DENY_GUI_ACCESS:-"false"}
+    : ${ZBX_DENY_GUI_ACCESS:="false"}
+    export ZBX_DENY_GUI_ACCESS=${ZBX_DENY_GUI_ACCESS,,}
     export ZBX_GUI_ACCESS_IP_RANGE=${ZBX_GUI_ACCESS_IP_RANGE:-"['127.0.0.1']"}
     export ZBX_GUI_WARNING_MSG=${ZBX_GUI_WARNING_MSG:-"Zabbix is under maintenance."}
 
@@ -202,17 +203,20 @@ prepare_zbx_web_config() {
     export ZBX_SERVER_PORT=${ZBX_SERVER_PORT:-"10051"}
     export ZBX_SERVER_NAME=${ZBX_SERVER_NAME}
 
-    export ZBX_DB_ENCRYPTION=${ZBX_DB_ENCRYPTION:-"false"}
+    : ${ZBX_DB_ENCRYPTION:="false"}
+    export ZBX_DB_ENCRYPTION=${ZBX_DB_ENCRYPTION,,}
     export ZBX_DB_KEY_FILE=${ZBX_DB_KEY_FILE}
     export ZBX_DB_CERT_FILE=${ZBX_DB_CERT_FILE}
     export ZBX_DB_CA_FILE=${ZBX_DB_CA_FILE}
-    export ZBX_DB_VERIFY_HOST=${ZBX_DB_VERIFY_HOST-"false"}
+    : ${ZBX_DB_VERIFY_HOST:="false"}
+    export ZBX_DB_VERIFY_HOST=${ZBX_DB_VERIFY_HOST,,}
 
     export ZBX_VAULTURL=${ZBX_VAULTURL}
     export ZBX_VAULTDBPATH=${ZBX_VAULTDBPATH}
     export VAULT_TOKEN=${VAULT_TOKEN}
 
-    export DB_DOUBLE_IEEE754=${DB_DOUBLE_IEEE754:-"true"}
+    : ${DB_DOUBLE_IEEE754:="true"}
+    export DB_DOUBLE_IEEE754=${DB_DOUBLE_IEEE754,,}
 
     export ZBX_HISTORYSTORAGEURL=${ZBX_HISTORYSTORAGEURL}
     export ZBX_HISTORYSTORAGETYPES=${ZBX_HISTORYSTORAGETYPES:-"[]"}
@@ -236,7 +240,9 @@ prepare_zbx_web_config() {
         "$ZABBIX_ETC_DIR/nginx_ssl.conf"
     fi
 
-    if [ "${ENABLE_WEB_ACCESS_LOG:-"true"}" == "false" ]; then
+    : ${ENABLE_WEB_ACCESS_LOG:="true"}
+
+    if [ "${ENABLE_WEB_ACCESS_LOG,,}" == "false" ]; then
         sed -ri \
             -e 's!^(\s*access_log).+\;!\1 off\;!g' \
             "/etc/nginx/nginx.conf"
diff --git a/web-nginx-pgsql/alpine/docker-entrypoint.sh b/web-nginx-pgsql/alpine/docker-entrypoint.sh
index e97c6ac19..0aa23bd47 100755
--- a/web-nginx-pgsql/alpine/docker-entrypoint.sh
+++ b/web-nginx-pgsql/alpine/docker-entrypoint.sh
@@ -5,7 +5,7 @@ set -o pipefail
 set +e
 
 # Script trace mode
-if [ "${DEBUG_MODE}" == "true" ]; then
+if [ "${DEBUG_MODE,,}" == "true" ]; then
     set -o xtrace
 fi
 
@@ -83,7 +83,7 @@ check_db_connect() {
     echo "* DB_SERVER_PORT: ${DB_SERVER_PORT}"
     echo "* DB_SERVER_DBNAME: ${DB_SERVER_DBNAME}"
     echo "* DB_SERVER_SCHEMA: ${DB_SERVER_SCHEMA}"
-    if [ "${DEBUG_MODE}" == "true" ]; then
+    if [ "${DEBUG_MODE,,}" == "true" ]; then
         if [ "${USE_DB_ROOT_USER}" == "true" ]; then
             echo "* DB_SERVER_ROOT_USER: ${DB_SERVER_ROOT_USER}"
             echo "* DB_SERVER_ROOT_PASS: ${DB_SERVER_ROOT_PASS}"
@@ -164,7 +164,8 @@ prepare_zbx_web_config() {
         echo "listen.group = nginx" >> "$PHP_CONFIG_FILE"
     fi
 
-    export ZBX_DENY_GUI_ACCESS=${ZBX_DENY_GUI_ACCESS:-"false"}
+    : ${ZBX_DENY_GUI_ACCESS:="false"}
+    export ZBX_DENY_GUI_ACCESS=${ZBX_DENY_GUI_ACCESS,,}
     export ZBX_GUI_ACCESS_IP_RANGE=${ZBX_GUI_ACCESS_IP_RANGE:-"['127.0.0.1']"}
     export ZBX_GUI_WARNING_MSG=${ZBX_GUI_WARNING_MSG:-"Zabbix is under maintenance."}
 
@@ -186,17 +187,20 @@ prepare_zbx_web_config() {
     export ZBX_SERVER_PORT=${ZBX_SERVER_PORT:-"10051"}
     export ZBX_SERVER_NAME=${ZBX_SERVER_NAME}
 
-    export ZBX_DB_ENCRYPTION=${ZBX_DB_ENCRYPTION:-"false"}
+    : ${ZBX_DB_ENCRYPTION:="false"}
+    export ZBX_DB_ENCRYPTION=${ZBX_DB_ENCRYPTION,,}
     export ZBX_DB_KEY_FILE=${ZBX_DB_KEY_FILE}
     export ZBX_DB_CERT_FILE=${ZBX_DB_CERT_FILE}
     export ZBX_DB_CA_FILE=${ZBX_DB_CA_FILE}
-    export ZBX_DB_VERIFY_HOST=${ZBX_DB_VERIFY_HOST-"false"}
+    : ${ZBX_DB_VERIFY_HOST:="false"}
+    export ZBX_DB_VERIFY_HOST=${ZBX_DB_VERIFY_HOST,,}
 
     export ZBX_VAULTURL=${ZBX_VAULTURL}
     export ZBX_VAULTDBPATH=${ZBX_VAULTDBPATH}
     export VAULT_TOKEN=${VAULT_TOKEN}
 
-    export DB_DOUBLE_IEEE754=${DB_DOUBLE_IEEE754:-"true"}
+    : ${DB_DOUBLE_IEEE754:="true"}
+    export DB_DOUBLE_IEEE754=${DB_DOUBLE_IEEE754,,}
 
     export ZBX_HISTORYSTORAGEURL=${ZBX_HISTORYSTORAGEURL}
     export ZBX_HISTORYSTORAGETYPES=${ZBX_HISTORYSTORAGETYPES:-"[]"}
@@ -218,7 +222,9 @@ prepare_zbx_web_config() {
         "$ZABBIX_ETC_DIR/nginx_ssl.conf"
     fi
 
-    if [ "${ENABLE_WEB_ACCESS_LOG:-"true"}" == "false" ]; then
+    : ${ENABLE_WEB_ACCESS_LOG:="true"}
+
+    if [ "${ENABLE_WEB_ACCESS_LOG,,}" == "false" ]; then
         sed -ri \
             -e 's!^(\s*access_log).+\;!\1 off\;!g' \
             "/etc/nginx/nginx.conf"
diff --git a/web-nginx-pgsql/centos/docker-entrypoint.sh b/web-nginx-pgsql/centos/docker-entrypoint.sh
index d68f6aa9a..e55696ad3 100755
--- a/web-nginx-pgsql/centos/docker-entrypoint.sh
+++ b/web-nginx-pgsql/centos/docker-entrypoint.sh
@@ -5,7 +5,7 @@ set -o pipefail
 set +e
 
 # Script trace mode
-if [ "${DEBUG_MODE}" == "true" ]; then
+if [ "${DEBUG_MODE,,}" == "true" ]; then
     set -o xtrace
 fi
 
@@ -83,7 +83,7 @@ check_db_connect() {
     echo "* DB_SERVER_PORT: ${DB_SERVER_PORT}"
     echo "* DB_SERVER_DBNAME: ${DB_SERVER_DBNAME}"
     echo "* DB_SERVER_SCHEMA: ${DB_SERVER_SCHEMA}"
-    if [ "${DEBUG_MODE}" == "true" ]; then
+    if [ "${DEBUG_MODE,,}" == "true" ]; then
         if [ "${USE_DB_ROOT_USER}" == "true" ]; then
             echo "* DB_SERVER_ROOT_USER: ${DB_SERVER_ROOT_USER}"
             echo "* DB_SERVER_ROOT_PASS: ${DB_SERVER_ROOT_PASS}"
@@ -164,7 +164,8 @@ prepare_zbx_web_config() {
         echo "listen.group = nginx" >> "$PHP_CONFIG_FILE"
     fi
 
-    export ZBX_DENY_GUI_ACCESS=${ZBX_DENY_GUI_ACCESS:-"false"}
+    : ${ZBX_DENY_GUI_ACCESS:="false"}
+    export ZBX_DENY_GUI_ACCESS=${ZBX_DENY_GUI_ACCESS,,}
     export ZBX_GUI_ACCESS_IP_RANGE=${ZBX_GUI_ACCESS_IP_RANGE:-"['127.0.0.1']"}
     export ZBX_GUI_WARNING_MSG=${ZBX_GUI_WARNING_MSG:-"Zabbix is under maintenance."}
 
@@ -186,17 +187,20 @@ prepare_zbx_web_config() {
     export ZBX_SERVER_PORT=${ZBX_SERVER_PORT:-"10051"}
     export ZBX_SERVER_NAME=${ZBX_SERVER_NAME}
 
-    export ZBX_DB_ENCRYPTION=${ZBX_DB_ENCRYPTION:-"false"}
+    : ${ZBX_DB_ENCRYPTION:="false"}
+    export ZBX_DB_ENCRYPTION=${ZBX_DB_ENCRYPTION,,}
     export ZBX_DB_KEY_FILE=${ZBX_DB_KEY_FILE}
     export ZBX_DB_CERT_FILE=${ZBX_DB_CERT_FILE}
     export ZBX_DB_CA_FILE=${ZBX_DB_CA_FILE}
-    export ZBX_DB_VERIFY_HOST=${ZBX_DB_VERIFY_HOST-"false"}
+    : ${ZBX_DB_VERIFY_HOST:="false"}
+    export ZBX_DB_VERIFY_HOST=${ZBX_DB_VERIFY_HOST,,}
 
     export ZBX_VAULTURL=${ZBX_VAULTURL}
     export ZBX_VAULTDBPATH=${ZBX_VAULTDBPATH}
     export VAULT_TOKEN=${VAULT_TOKEN}
 
-    export DB_DOUBLE_IEEE754=${DB_DOUBLE_IEEE754:-"true"}
+    : ${DB_DOUBLE_IEEE754:="true"}
+    export DB_DOUBLE_IEEE754=${DB_DOUBLE_IEEE754,,}
 
     export ZBX_HISTORYSTORAGEURL=${ZBX_HISTORYSTORAGEURL}
     export ZBX_HISTORYSTORAGETYPES=${ZBX_HISTORYSTORAGETYPES:-"[]"}
@@ -218,7 +222,9 @@ prepare_zbx_web_config() {
         "$ZABBIX_ETC_DIR/nginx_ssl.conf"
     fi
 
-    if [ "${ENABLE_WEB_ACCESS_LOG:-"true"}" == "false" ]; then
+    : ${ENABLE_WEB_ACCESS_LOG:="true"}
+
+    if [ "${ENABLE_WEB_ACCESS_LOG,,}" == "false" ]; then
         sed -ri \
             -e 's!^(\s*access_log).+\;!\1 off\;!g' \
             "/etc/nginx/nginx.conf"
diff --git a/web-nginx-pgsql/ubuntu/docker-entrypoint.sh b/web-nginx-pgsql/ubuntu/docker-entrypoint.sh
index 37e5e8440..aaefdf8d0 100755
--- a/web-nginx-pgsql/ubuntu/docker-entrypoint.sh
+++ b/web-nginx-pgsql/ubuntu/docker-entrypoint.sh
@@ -5,7 +5,7 @@ set -o pipefail
 set +e
 
 # Script trace mode
-if [ "${DEBUG_MODE}" == "true" ]; then
+if [ "${DEBUG_MODE,,}" == "true" ]; then
     set -o xtrace
 fi
 
@@ -83,7 +83,7 @@ check_db_connect() {
     echo "* DB_SERVER_PORT: ${DB_SERVER_PORT}"
     echo "* DB_SERVER_DBNAME: ${DB_SERVER_DBNAME}"
     echo "* DB_SERVER_SCHEMA: ${DB_SERVER_SCHEMA}"
-    if [ "${DEBUG_MODE}" == "true" ]; then
+    if [ "${DEBUG_MODE,,}" == "true" ]; then
         if [ "${USE_DB_ROOT_USER}" == "true" ]; then
             echo "* DB_SERVER_ROOT_USER: ${DB_SERVER_ROOT_USER}"
             echo "* DB_SERVER_ROOT_PASS: ${DB_SERVER_ROOT_PASS}"
@@ -164,7 +164,8 @@ prepare_zbx_web_config() {
         echo "listen.group = nginx" >> "$PHP_CONFIG_FILE"
     fi
 
-    export ZBX_DENY_GUI_ACCESS=${ZBX_DENY_GUI_ACCESS:-"false"}
+    : ${ZBX_DENY_GUI_ACCESS:="false"}
+    export ZBX_DENY_GUI_ACCESS=${ZBX_DENY_GUI_ACCESS,,}
     export ZBX_GUI_ACCESS_IP_RANGE=${ZBX_GUI_ACCESS_IP_RANGE:-"['127.0.0.1']"}
     export ZBX_GUI_WARNING_MSG=${ZBX_GUI_WARNING_MSG:-"Zabbix is under maintenance."}
 
@@ -186,17 +187,20 @@ prepare_zbx_web_config() {
     export ZBX_SERVER_PORT=${ZBX_SERVER_PORT:-"10051"}
     export ZBX_SERVER_NAME=${ZBX_SERVER_NAME}
 
-    export ZBX_DB_ENCRYPTION=${ZBX_DB_ENCRYPTION:-"false"}
+    : ${ZBX_DB_ENCRYPTION:="false"}
+    export ZBX_DB_ENCRYPTION=${ZBX_DB_ENCRYPTION,,}
     export ZBX_DB_KEY_FILE=${ZBX_DB_KEY_FILE}
     export ZBX_DB_CERT_FILE=${ZBX_DB_CERT_FILE}
     export ZBX_DB_CA_FILE=${ZBX_DB_CA_FILE}
-    export ZBX_DB_VERIFY_HOST=${ZBX_DB_VERIFY_HOST-"false"}
+    : ${ZBX_DB_VERIFY_HOST:="false"}
+    export ZBX_DB_VERIFY_HOST=${ZBX_DB_VERIFY_HOST,,}
 
     export ZBX_VAULTURL=${ZBX_VAULTURL}
     export ZBX_VAULTDBPATH=${ZBX_VAULTDBPATH}
     export VAULT_TOKEN=${VAULT_TOKEN}
 
-    export DB_DOUBLE_IEEE754=${DB_DOUBLE_IEEE754:-"true"}
+    : ${DB_DOUBLE_IEEE754:="true"}
+    export DB_DOUBLE_IEEE754=${DB_DOUBLE_IEEE754,,}
 
     export ZBX_HISTORYSTORAGEURL=${ZBX_HISTORYSTORAGEURL}
     export ZBX_HISTORYSTORAGETYPES=${ZBX_HISTORYSTORAGETYPES:-"[]"}
@@ -218,7 +222,9 @@ prepare_zbx_web_config() {
         "$ZABBIX_ETC_DIR/nginx_ssl.conf"
     fi
 
-    if [ "${ENABLE_WEB_ACCESS_LOG:-"true"}" == "false" ]; then
+    : ${ENABLE_WEB_ACCESS_LOG:="true"}
+
+    if [ "${ENABLE_WEB_ACCESS_LOG,,}" == "false" ]; then
         sed -ri \
             -e 's!^(\s*access_log).+\;!\1 off\;!g' \
             "/etc/nginx/nginx.conf"
diff --git a/zabbix-appliance/rhel/docker-entrypoint.sh b/zabbix-appliance/rhel/docker-entrypoint.sh
index a0670f3be..af4a5bdac 100755
--- a/zabbix-appliance/rhel/docker-entrypoint.sh
+++ b/zabbix-appliance/rhel/docker-entrypoint.sh
@@ -5,7 +5,7 @@ set -o pipefail
 set +e
 
 # Script trace mode
-if [ "${DEBUG_MODE}" == "true" ]; then
+if [ "${DEBUG_MODE,,}" == "true" ]; then
     set -o xtrace
 fi
 
@@ -17,6 +17,9 @@ fi
 : ${DB_SERVER_HOST:="localhost"}
 : ${DB_SERVER_PORT:="3306"}
 
+# Default timezone for web interface
+: ${PHP_TZ:="Europe/Riga"}
+
 # Default directories
 # User 'zabbix' home directory
 ZABBIX_USER_HOME_DIR="/var/lib/zabbix"
@@ -199,17 +202,17 @@ check_variables_mysql() {
 
     file_env MYSQL_ROOT_PASSWORD
 
-    if [ ! -n "${MYSQL_USER}" ] && [ "${MYSQL_RANDOM_ROOT_PASSWORD}" == "true" ]; then
+    if [ ! -n "${MYSQL_USER}" ] && [ "${MYSQL_RANDOM_ROOT_PASSWORD,,}" == "true" ]; then
         echo "**** Impossible to use MySQL server because of unknown Zabbix user and random 'root' password"
         exit 1
     fi
 
-    if [ ! -n "${MYSQL_USER}" ] && [ ! -n "${MYSQL_ROOT_PASSWORD}" ] && [ "${MYSQL_ALLOW_EMPTY_PASSWORD}" != "true" ]; then
+    if [ ! -n "${MYSQL_USER}" ] && [ ! -n "${MYSQL_ROOT_PASSWORD}" ] && [ "${MYSQL_ALLOW_EMPTY_PASSWORD,,}" != "true" ]; then
         echo "*** Impossible to use MySQL server because 'root' password is not defined and it is not empty"
         exit 1
     fi
 
-    if [ "${MYSQL_ALLOW_EMPTY_PASSWORD}" == "true" ] || [ -n "${MYSQL_ROOT_PASSWORD}" ]; then
+    if [ "${MYSQL_ALLOW_EMPTY_PASSWORD,,}" == "true" ] || [ -n "${MYSQL_ROOT_PASSWORD}" ]; then
         USE_DB_ROOT_USER=true
         DB_SERVER_ROOT_USER="root"
         DB_SERVER_ROOT_PASS=${MYSQL_ROOT_PASSWORD:-""}
@@ -219,7 +222,7 @@ check_variables_mysql() {
 
     # If root password is not specified use provided credentials
     : ${DB_SERVER_ROOT_USER:=${MYSQL_USER}}
-    [ "${MYSQL_ALLOW_EMPTY_PASSWORD}" == "true" ] || DB_SERVER_ROOT_PASS=${DB_SERVER_ROOT_PASS:-${MYSQL_PASSWORD}}
+    [ "${MYSQL_ALLOW_EMPTY_PASSWORD,,}" == "true" ] || DB_SERVER_ROOT_PASS=${DB_SERVER_ROOT_PASS:-${MYSQL_PASSWORD}}
     DB_SERVER_ZBX_USER=${MYSQL_USER:-"zabbix"}
     DB_SERVER_ZBX_PASS=${MYSQL_PASSWORD:-"zabbix"}
 
@@ -257,7 +260,7 @@ check_db_connect() {
     echo "* DB_SERVER_HOST: ${DB_SERVER_HOST}"
     echo "* DB_SERVER_PORT: ${DB_SERVER_PORT}"
     echo "* DB_SERVER_DBNAME: ${DB_SERVER_DBNAME}"
-    if [ "${DEBUG_MODE}" == "true" ]; then
+    if [ "${DEBUG_MODE,,}" == "true" ]; then
         if [ "${USE_DB_ROOT_USER}" == "true" ]; then
             echo "* DB_SERVER_ROOT_USER: ${DB_SERVER_ROOT_USER}"
             echo "* DB_SERVER_ROOT_PASS: ${DB_SERVER_ROOT_PASS}"
@@ -457,7 +460,7 @@ update_zbx_config() {
     update_config_var $ZBX_CONFIG "VMwareTimeout" "${ZBX_VMWARETIMEOUT}"
 
     : ${ZBX_ENABLE_SNMP_TRAPS:="false"}
-    if [ "${ZBX_ENABLE_SNMP_TRAPS}" == "true" ]; then
+    if [ "${ZBX_ENABLE_SNMP_TRAPS,,}" == "true" ]; then
         update_config_var $ZBX_CONFIG "SNMPTrapperFile" "${ZABBIX_USER_HOME_DIR}/snmptraps/snmptraps.log"
         update_config_var $ZBX_CONFIG "StartSNMPTrapper" "1"
     else
@@ -545,7 +548,8 @@ prepare_zbx_web_config() {
         echo "listen.group = nginx" >> "$PHP_CONFIG_FILE"
     fi
 
-    export ZBX_DENY_GUI_ACCESS=${ZBX_DENY_GUI_ACCESS:-"false"}
+    : ${ZBX_DENY_GUI_ACCESS:="false"}
+    export ZBX_DENY_GUI_ACCESS=${ZBX_DENY_GUI_ACCESS,,}
     export ZBX_GUI_ACCESS_IP_RANGE=${ZBX_GUI_ACCESS_IP_RANGE:-"['127.0.0.1']"}
     export ZBX_GUI_WARNING_MSG=${ZBX_GUI_WARNING_MSG:-"Zabbix is under maintenance."}
 
@@ -567,17 +571,20 @@ prepare_zbx_web_config() {
     export ZBX_SERVER_PORT="10051"
     export ZBX_SERVER_NAME=${ZBX_SERVER_NAME}
 
-    export ZBX_DB_ENCRYPTION=${ZBX_DB_ENCRYPTION:-"false"}
+    : ${ZBX_DB_ENCRYPTION:-"false"}
+    export ZBX_DB_ENCRYPTION=${ZBX_DB_ENCRYPTION,,}
     export ZBX_DB_KEY_FILE=${ZBX_DB_KEY_FILE}
     export ZBX_DB_CERT_FILE=${ZBX_DB_CERT_FILE}
     export ZBX_DB_CA_FILE=${ZBX_DB_CA_FILE}
-    export ZBX_DB_VERIFY_HOST=${ZBX_DB_VERIFY_HOST-"false"}
+    : ${ZBX_DB_VERIFY_HOST:="false"}
+    export ZBX_DB_VERIFY_HOST=${ZBX_DB_VERIFY_HOST,,}
 
     export ZBX_VAULTURL=${ZBX_VAULTURL}
     export ZBX_VAULTDBPATH=${ZBX_VAULTDBPATH}
     export VAULT_TOKEN=${VAULT_TOKEN}
 
-    export DB_DOUBLE_IEEE754=${DB_DOUBLE_IEEE754:-"true"}
+    : ${DB_DOUBLE_IEEE754:="true"}
+    export DB_DOUBLE_IEEE754=${DB_DOUBLE_IEEE754,,}
 
     export ZBX_HISTORYSTORAGEURL=${ZBX_HISTORYSTORAGEURL}
     export ZBX_HISTORYSTORAGETYPES=${ZBX_HISTORYSTORAGETYPES:-"[]"}
@@ -601,7 +608,9 @@ prepare_zbx_web_config() {
         "$ZABBIX_ETC_DIR/nginx_ssl.conf"
     fi
 
-    if [ "${ENABLE_WEB_ACCESS_LOG:-"true"}" == "false" ]; then
+    : ${ENABLE_WEB_ACCESS_LOG:="true"}
+
+    if [ "${ENABLE_WEB_ACCESS_LOG,,}" == "false" ]; then
         sed -ri \
             -e 's!^(\s*access_log).+\;!\1 off\;!g' \
             "/etc/nginx/nginx.conf"