diff --git a/agent/alpine/docker-entrypoint.sh b/agent/alpine/docker-entrypoint.sh
index 32f56cc60..a31cbbb23 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
 
@@ -134,7 +134,7 @@ 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
@@ -146,7 +146,7 @@ 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 32f56cc60..a31cbbb23 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
 
@@ -134,7 +134,7 @@ 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
@@ -146,7 +146,7 @@ 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 32f56cc60..a31cbbb23 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
 
@@ -134,7 +134,7 @@ 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
@@ -146,7 +146,7 @@ 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/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 458b5283f..3d2794c41 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"}
 
@@ -182,7 +182,7 @@ 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}"
@@ -321,7 +321,7 @@ 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"}"
@@ -338,7 +338,7 @@ 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 5b234b394..9f2450b43 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"}
 
@@ -182,7 +182,7 @@ 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}"
@@ -321,7 +321,7 @@ 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"}"
@@ -338,7 +338,7 @@ 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 7f28723cc..9b949a8e3 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"}
 
@@ -182,7 +182,7 @@ 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}"
@@ -321,7 +321,7 @@ 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"}"
@@ -338,7 +338,7 @@ 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 2173886fb..39d39e097 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
 
@@ -158,7 +158,7 @@ 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"}"
@@ -175,7 +175,7 @@ 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 2173886fb..39d39e097 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
 
@@ -158,7 +158,7 @@ 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"}"
@@ -175,7 +175,7 @@ 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 f42a19189..ae3bf72f4 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
 
@@ -158,7 +158,7 @@ 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"}"
@@ -175,7 +175,7 @@ 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 446b37b89..6db086bca 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"}
 
@@ -177,7 +177,7 @@ 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}"
@@ -302,7 +302,7 @@ update_zbx_config() {
     update_config_var $ZBX_CONFIG "StartEscalators" "${ZBX_STARTESCALATORS}"
 
     : ${ZBX_JAVAGATEWAY_ENABLE:="false"}
-    if [ "${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"}"
@@ -319,7 +319,7 @@ 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 446b37b89..6db086bca 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"}
 
@@ -177,7 +177,7 @@ 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}"
@@ -302,7 +302,7 @@ update_zbx_config() {
     update_config_var $ZBX_CONFIG "StartEscalators" "${ZBX_STARTESCALATORS}"
 
     : ${ZBX_JAVAGATEWAY_ENABLE:="false"}
-    if [ "${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"}"
@@ -319,7 +319,7 @@ 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 1595dd37b..34d455680 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"}
 
@@ -177,7 +177,7 @@ 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}"
@@ -302,7 +302,7 @@ update_zbx_config() {
     update_config_var $ZBX_CONFIG "StartEscalators" "${ZBX_STARTESCALATORS}"
 
     : ${ZBX_JAVAGATEWAY_ENABLE:="false"}
-    if [ "${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"}"
@@ -319,7 +319,7 @@ 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 eb075cd05..b15aa17e7 100755
--- a/server-pgsql/alpine/docker-entrypoint.sh
+++ b/server-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
 
@@ -159,7 +159,7 @@ 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
@@ -310,7 +310,7 @@ update_zbx_config() {
     update_config_var $ZBX_CONFIG "StartEscalators" "${ZBX_STARTESCALATORS}"
 
     : ${ZBX_JAVAGATEWAY_ENABLE:="false"}
-    if [ "${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"}"
@@ -327,7 +327,7 @@ 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 eb075cd05..b15aa17e7 100755
--- a/server-pgsql/centos/docker-entrypoint.sh
+++ b/server-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
 
@@ -159,7 +159,7 @@ 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
@@ -310,7 +310,7 @@ update_zbx_config() {
     update_config_var $ZBX_CONFIG "StartEscalators" "${ZBX_STARTESCALATORS}"
 
     : ${ZBX_JAVAGATEWAY_ENABLE:="false"}
-    if [ "${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"}"
@@ -327,7 +327,7 @@ 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 4305bd2c9..37214bebf 100755
--- a/server-pgsql/ubuntu/docker-entrypoint.sh
+++ b/server-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
 
@@ -159,7 +159,7 @@ 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
@@ -310,7 +310,7 @@ update_zbx_config() {
     update_config_var $ZBX_CONFIG "StartEscalators" "${ZBX_STARTESCALATORS}"
 
     : ${ZBX_JAVAGATEWAY_ENABLE:="false"}
-    if [ "${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"}"
@@ -327,7 +327,7 @@ 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/web-apache-mysql/alpine/docker-entrypoint.sh b/web-apache-mysql/alpine/docker-entrypoint.sh
index 72aba5578..9a756f51c 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
 
@@ -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"}
 
@@ -98,7 +98,7 @@ 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: ${DB_SERVER_ROOT_PASS}"
@@ -168,7 +168,9 @@ prepare_zbx_web_config() {
     export ZBX_SERVER_PORT=${ZBX_SERVER_PORT:-"10051"}
     export ZBX_SERVER_NAME=${ZBX_SERVER_NAME}
 
-    if [ "${ENABLE_WEB_ACCESS_LOG:-"true"}" == "false" ]; then
+    ENABLE_WEB_ACCESS_LOG=${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 94612251f..5ff556d2d 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
 
@@ -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"}
 
@@ -98,7 +98,7 @@ 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: ${DB_SERVER_ROOT_PASS}"
@@ -168,7 +168,9 @@ prepare_zbx_web_config() {
     export ZBX_SERVER_PORT=${ZBX_SERVER_PORT:-"10051"}
     export ZBX_SERVER_NAME=${ZBX_SERVER_NAME}
 
-    if [ "${ENABLE_WEB_ACCESS_LOG:-"true"}" == "false" ]; then
+    ENABLE_WEB_ACCESS_LOG=${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 cf7b4d8f8..b42a664ca 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
 
@@ -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"}
 
@@ -98,7 +98,7 @@ 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: ${DB_SERVER_ROOT_PASS}"
@@ -168,7 +168,9 @@ prepare_zbx_web_config() {
     export ZBX_SERVER_PORT=${ZBX_SERVER_PORT:-"10051"}
     export ZBX_SERVER_NAME=${ZBX_SERVER_NAME}
 
-    if [ "${ENABLE_WEB_ACCESS_LOG:-"true"}" == "false" ]; then
+    ENABLE_WEB_ACCESS_LOG=${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 16297630c..b0d793525 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
 
@@ -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: ${DB_SERVER_ROOT_PASS}"
@@ -165,7 +165,9 @@ prepare_zbx_web_config() {
     export ZBX_SERVER_PORT=${ZBX_SERVER_PORT:-"10051"}
     export ZBX_SERVER_NAME=${ZBX_SERVER_NAME}
 
-    if [ "${ENABLE_WEB_ACCESS_LOG:-"true"}" == "false" ]; then
+    ENABLE_WEB_ACCESS_LOG=${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 d924f2ff2..e8eac21b6 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
 
@@ -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: ${DB_SERVER_ROOT_PASS}"
@@ -165,7 +165,9 @@ prepare_zbx_web_config() {
     export ZBX_SERVER_PORT=${ZBX_SERVER_PORT:-"10051"}
     export ZBX_SERVER_NAME=${ZBX_SERVER_NAME}
 
-    if [ "${ENABLE_WEB_ACCESS_LOG:-"true"}" == "false" ]; then
+    ENABLE_WEB_ACCESS_LOG=${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 10f005e3a..d738a5f3c 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
 
@@ -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: ${DB_SERVER_ROOT_PASS}"
@@ -165,7 +165,9 @@ prepare_zbx_web_config() {
     export ZBX_SERVER_PORT=${ZBX_SERVER_PORT:-"10051"}
     export ZBX_SERVER_NAME=${ZBX_SERVER_NAME}
 
-    if [ "${ENABLE_WEB_ACCESS_LOG:-"true"}" == "false" ]; then
+    ENABLE_WEB_ACCESS_LOG=${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 0c2b8a7e4..d7de2624d 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=${MYSQL_ROOT_PASSWORD:-""}
@@ -85,8 +85,8 @@ check_variables() {
     [ -n "${MYSQL_USER}" ] && CREATE_ZBX_DB_USER=true
 
     # 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}}
+    : ${DB_SERVER_ROOT_USER:=${MYSQL_USER}}
+    [ "${MYSQL_ALLOW_EMPTY_PASSWORD,,}" == "true" ] || DB_SERVER_ROOT_PASS=${DB_SERVER_ROOT_PASS:-${MYSQL_PASSWORD}}
     DB_SERVER_ZBX_USER=${MYSQL_USER:-"zabbix"}
     DB_SERVER_ZBX_PASS=${MYSQL_PASSWORD:-"zabbix"}
 
@@ -98,7 +98,7 @@ 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: ${DB_SERVER_ROOT_PASS}"
@@ -189,7 +189,9 @@ prepare_zbx_web_config() {
         "$ZABBIX_ETC_DIR/nginx_ssl.conf"
     fi
 
-    if [ "${ENABLE_WEB_ACCESS_LOG:-"true"}" == "false" ]; then
+    ENABLE_WEB_ACCESS_LOG=${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 962f4f388..bb70db748 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=${MYSQL_ROOT_PASSWORD:-""}
@@ -85,8 +85,8 @@ check_variables() {
     [ -n "${MYSQL_USER}" ] && CREATE_ZBX_DB_USER=true
 
     # 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}}
+    : ${DB_SERVER_ROOT_USER:=${MYSQL_USER}}
+    [ "${MYSQL_ALLOW_EMPTY_PASSWORD,,}" == "true" ] || DB_SERVER_ROOT_PASS=${DB_SERVER_ROOT_PASS:-${MYSQL_PASSWORD}}
     DB_SERVER_ZBX_USER=${MYSQL_USER:-"zabbix"}
     DB_SERVER_ZBX_PASS=${MYSQL_PASSWORD:-"zabbix"}
 
@@ -98,7 +98,7 @@ 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: ${DB_SERVER_ROOT_PASS}"
@@ -189,7 +189,9 @@ prepare_zbx_web_config() {
         "$ZABBIX_ETC_DIR/nginx_ssl.conf"
     fi
 
-    if [ "${ENABLE_WEB_ACCESS_LOG:-"true"}" == "false" ]; then
+    ENABLE_WEB_ACCESS_LOG=${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 9be717bf3..f62b2233d 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=${MYSQL_ROOT_PASSWORD:-""}
@@ -85,8 +85,8 @@ check_variables() {
     [ -n "${MYSQL_USER}" ] && CREATE_ZBX_DB_USER=true
 
     # 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}}
+    : ${DB_SERVER_ROOT_USER:=${MYSQL_USER}}
+    [ "${MYSQL_ALLOW_EMPTY_PASSWORD,,}" == "true" ] || DB_SERVER_ROOT_PASS=${DB_SERVER_ROOT_PASS:-${MYSQL_PASSWORD}}
     DB_SERVER_ZBX_USER=${MYSQL_USER:-"zabbix"}
     DB_SERVER_ZBX_PASS=${MYSQL_PASSWORD:-"zabbix"}
 
@@ -98,7 +98,7 @@ 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: ${DB_SERVER_ROOT_PASS}"
@@ -189,7 +189,9 @@ prepare_zbx_web_config() {
         "$ZABBIX_ETC_DIR/nginx_ssl.conf"
     fi
 
-    if [ "${ENABLE_WEB_ACCESS_LOG:-"true"}" == "false" ]; then
+    ENABLE_WEB_ACCESS_LOG=${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 8adf447e5..05ed641db 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: ${DB_SERVER_ROOT_PASS}"
@@ -186,7 +186,9 @@ prepare_zbx_web_config() {
         "$ZABBIX_ETC_DIR/nginx_ssl.conf"
     fi
 
-    if [ "${ENABLE_WEB_ACCESS_LOG:-"true"}" == "false" ]; then
+    ENABLE_WEB_ACCESS_LOG=${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 a61df4f45..296db45ec 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: ${DB_SERVER_ROOT_PASS}"
@@ -186,7 +186,9 @@ prepare_zbx_web_config() {
         "$ZABBIX_ETC_DIR/nginx_ssl.conf"
     fi
 
-    if [ "${ENABLE_WEB_ACCESS_LOG:-"true"}" == "false" ]; then
+    ENABLE_WEB_ACCESS_LOG=${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 db1c55418..491cf1541 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: ${DB_SERVER_ROOT_PASS}"
@@ -186,7 +186,9 @@ prepare_zbx_web_config() {
         "$ZABBIX_ETC_DIR/nginx_ssl.conf"
     fi
 
-    if [ "${ENABLE_WEB_ACCESS_LOG:-"true"}" == "false" ]; then
+    ENABLE_WEB_ACCESS_LOG=${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"