diff --git a/Dockerfiles/proxy-mysql/alpine/docker-entrypoint.sh b/Dockerfiles/proxy-mysql/alpine/docker-entrypoint.sh
index c76e91525..d02c0e88a 100755
--- a/Dockerfiles/proxy-mysql/alpine/docker-entrypoint.sh
+++ b/Dockerfiles/proxy-mysql/alpine/docker-entrypoint.sh
@@ -159,9 +159,12 @@ file_process_from_env() {
 
 # Check prerequisites for MySQL database
 check_variables_mysql() {
-    if [ ! -n "${DB_SERVER_SOCKET}" ]; then
+    if [ -n "${DB_SERVER_SOCKET}" ]; then
+        mysql_connect_args="-S ${DB_SERVER_SOCKET}"
+    else
         : ${DB_SERVER_HOST:="mysql-server"}
         : ${DB_SERVER_PORT:="3306"}
+        mysql_connect_args="-h ${DB_SERVER_HOST} -P ${DB_SERVER_PORT}"
     fi
 
     USE_DB_ROOT_USER=false
@@ -198,11 +201,6 @@ check_variables_mysql() {
 
     DB_SERVER_DBNAME=${MYSQL_DATABASE:-"zabbix_proxy"}
 
-    if [ ! -n "${DB_SERVER_SOCKET}" ]; then
-        mysql_connect_args="-h ${DB_SERVER_HOST} -P ${DB_SERVER_PORT}"
-    else
-        mysql_connect_args="-S ${DB_SERVER_SOCKET}"
-    fi
 }
 
 db_tls_params() {
diff --git a/Dockerfiles/proxy-mysql/centos/docker-entrypoint.sh b/Dockerfiles/proxy-mysql/centos/docker-entrypoint.sh
index c6706640a..46b9abc50 100755
--- a/Dockerfiles/proxy-mysql/centos/docker-entrypoint.sh
+++ b/Dockerfiles/proxy-mysql/centos/docker-entrypoint.sh
@@ -159,9 +159,12 @@ file_process_from_env() {
 
 # Check prerequisites for MySQL database
 check_variables_mysql() {
-    if [ ! -n "${DB_SERVER_SOCKET}" ]; then
+    if [ -n "${DB_SERVER_SOCKET}" ]; then
+        mysql_connect_args="-S ${DB_SERVER_SOCKET}"
+    else
         : ${DB_SERVER_HOST:="mysql-server"}
         : ${DB_SERVER_PORT:="3306"}
+        mysql_connect_args="-h ${DB_SERVER_HOST} -P ${DB_SERVER_PORT}"
     fi
 
     USE_DB_ROOT_USER=false
@@ -198,11 +201,6 @@ check_variables_mysql() {
 
     DB_SERVER_DBNAME=${MYSQL_DATABASE:-"zabbix_proxy"}
 
-    if [ ! -n "${DB_SERVER_SOCKET}" ]; then
-        mysql_connect_args="-h ${DB_SERVER_HOST} -P ${DB_SERVER_PORT}"
-    else
-        mysql_connect_args="-S ${DB_SERVER_SOCKET}"
-    fi
 }
 
 db_tls_params() {
diff --git a/Dockerfiles/proxy-mysql/ol/docker-entrypoint.sh b/Dockerfiles/proxy-mysql/ol/docker-entrypoint.sh
index d08049c38..ef5043fea 100755
--- a/Dockerfiles/proxy-mysql/ol/docker-entrypoint.sh
+++ b/Dockerfiles/proxy-mysql/ol/docker-entrypoint.sh
@@ -159,9 +159,12 @@ file_process_from_env() {
 
 # Check prerequisites for MySQL database
 check_variables_mysql() {
-    if [ ! -n "${DB_SERVER_SOCKET}" ]; then
+    if [ -n "${DB_SERVER_SOCKET}" ]; then
+        mysql_connect_args="-S ${DB_SERVER_SOCKET}"
+    else
         : ${DB_SERVER_HOST:="mysql-server"}
         : ${DB_SERVER_PORT:="3306"}
+        mysql_connect_args="-h ${DB_SERVER_HOST} -P ${DB_SERVER_PORT}"
     fi
 
     USE_DB_ROOT_USER=false
@@ -198,11 +201,6 @@ check_variables_mysql() {
 
     DB_SERVER_DBNAME=${MYSQL_DATABASE:-"zabbix_proxy"}
 
-    if [ ! -n "${DB_SERVER_SOCKET}" ]; then
-        mysql_connect_args="-h ${DB_SERVER_HOST} -P ${DB_SERVER_PORT}"
-    else
-        mysql_connect_args="-S ${DB_SERVER_SOCKET}"
-    fi
 }
 
 db_tls_params() {
diff --git a/Dockerfiles/proxy-mysql/rhel/docker-entrypoint.sh b/Dockerfiles/proxy-mysql/rhel/docker-entrypoint.sh
index c6706640a..46b9abc50 100755
--- a/Dockerfiles/proxy-mysql/rhel/docker-entrypoint.sh
+++ b/Dockerfiles/proxy-mysql/rhel/docker-entrypoint.sh
@@ -159,9 +159,12 @@ file_process_from_env() {
 
 # Check prerequisites for MySQL database
 check_variables_mysql() {
-    if [ ! -n "${DB_SERVER_SOCKET}" ]; then
+    if [ -n "${DB_SERVER_SOCKET}" ]; then
+        mysql_connect_args="-S ${DB_SERVER_SOCKET}"
+    else
         : ${DB_SERVER_HOST:="mysql-server"}
         : ${DB_SERVER_PORT:="3306"}
+        mysql_connect_args="-h ${DB_SERVER_HOST} -P ${DB_SERVER_PORT}"
     fi
 
     USE_DB_ROOT_USER=false
@@ -198,11 +201,6 @@ check_variables_mysql() {
 
     DB_SERVER_DBNAME=${MYSQL_DATABASE:-"zabbix_proxy"}
 
-    if [ ! -n "${DB_SERVER_SOCKET}" ]; then
-        mysql_connect_args="-h ${DB_SERVER_HOST} -P ${DB_SERVER_PORT}"
-    else
-        mysql_connect_args="-S ${DB_SERVER_SOCKET}"
-    fi
 }
 
 db_tls_params() {
diff --git a/Dockerfiles/proxy-mysql/ubuntu/docker-entrypoint.sh b/Dockerfiles/proxy-mysql/ubuntu/docker-entrypoint.sh
index c6706640a..46b9abc50 100755
--- a/Dockerfiles/proxy-mysql/ubuntu/docker-entrypoint.sh
+++ b/Dockerfiles/proxy-mysql/ubuntu/docker-entrypoint.sh
@@ -159,9 +159,12 @@ file_process_from_env() {
 
 # Check prerequisites for MySQL database
 check_variables_mysql() {
-    if [ ! -n "${DB_SERVER_SOCKET}" ]; then
+    if [ -n "${DB_SERVER_SOCKET}" ]; then
+        mysql_connect_args="-S ${DB_SERVER_SOCKET}"
+    else
         : ${DB_SERVER_HOST:="mysql-server"}
         : ${DB_SERVER_PORT:="3306"}
+        mysql_connect_args="-h ${DB_SERVER_HOST} -P ${DB_SERVER_PORT}"
     fi
 
     USE_DB_ROOT_USER=false
@@ -198,11 +201,6 @@ check_variables_mysql() {
 
     DB_SERVER_DBNAME=${MYSQL_DATABASE:-"zabbix_proxy"}
 
-    if [ ! -n "${DB_SERVER_SOCKET}" ]; then
-        mysql_connect_args="-h ${DB_SERVER_HOST} -P ${DB_SERVER_PORT}"
-    else
-        mysql_connect_args="-S ${DB_SERVER_SOCKET}"
-    fi
 }
 
 db_tls_params() {
diff --git a/Dockerfiles/server-mysql/alpine/docker-entrypoint.sh b/Dockerfiles/server-mysql/alpine/docker-entrypoint.sh
index 1edc3f671..1b2a4705c 100755
--- a/Dockerfiles/server-mysql/alpine/docker-entrypoint.sh
+++ b/Dockerfiles/server-mysql/alpine/docker-entrypoint.sh
@@ -156,9 +156,12 @@ file_process_from_env() {
 
 # Check prerequisites for MySQL database
 check_variables_mysql() {
-    if [ ! -n "${DB_SERVER_SOCKET}" ]; then
+    if [ -n "${DB_SERVER_SOCKET}" ]; then
+        mysql_connect_args="-S ${DB_SERVER_SOCKET}"
+    else
         : ${DB_SERVER_HOST:="mysql-server"}
         : ${DB_SERVER_PORT:="3306"}
+        mysql_connect_args="-h ${DB_SERVER_HOST} -P ${DB_SERVER_PORT}"
     fi
 
     USE_DB_ROOT_USER=false
@@ -195,11 +198,6 @@ check_variables_mysql() {
 
     DB_SERVER_DBNAME=${MYSQL_DATABASE:-"zabbix"}
 
-    if [ ! -n "${DB_SERVER_SOCKET}" ]; then
-        mysql_connect_args="-h ${DB_SERVER_HOST} -P ${DB_SERVER_PORT}"
-    else
-        mysql_connect_args="-S ${DB_SERVER_SOCKET}"
-    fi
 }
 
 db_tls_params() {
diff --git a/Dockerfiles/server-mysql/centos/docker-entrypoint.sh b/Dockerfiles/server-mysql/centos/docker-entrypoint.sh
index ed61897fe..d739d705f 100755
--- a/Dockerfiles/server-mysql/centos/docker-entrypoint.sh
+++ b/Dockerfiles/server-mysql/centos/docker-entrypoint.sh
@@ -156,9 +156,12 @@ file_process_from_env() {
 
 # Check prerequisites for MySQL database
 check_variables_mysql() {
-    if [ ! -n "${DB_SERVER_SOCKET}" ]; then
+    if [ -n "${DB_SERVER_SOCKET}" ]; then
+        mysql_connect_args="-S ${DB_SERVER_SOCKET}"
+    else
         : ${DB_SERVER_HOST:="mysql-server"}
         : ${DB_SERVER_PORT:="3306"}
+        mysql_connect_args="-h ${DB_SERVER_HOST} -P ${DB_SERVER_PORT}"
     fi
 
     USE_DB_ROOT_USER=false
@@ -195,11 +198,6 @@ check_variables_mysql() {
 
     DB_SERVER_DBNAME=${MYSQL_DATABASE:-"zabbix"}
 
-    if [ ! -n "${DB_SERVER_SOCKET}" ]; then
-        mysql_connect_args="-h ${DB_SERVER_HOST} -P ${DB_SERVER_PORT}"
-    else
-        mysql_connect_args="-S ${DB_SERVER_SOCKET}"
-    fi
 }
 
 db_tls_params() {
diff --git a/Dockerfiles/server-mysql/ol/docker-entrypoint.sh b/Dockerfiles/server-mysql/ol/docker-entrypoint.sh
index ed61897fe..d739d705f 100755
--- a/Dockerfiles/server-mysql/ol/docker-entrypoint.sh
+++ b/Dockerfiles/server-mysql/ol/docker-entrypoint.sh
@@ -156,9 +156,12 @@ file_process_from_env() {
 
 # Check prerequisites for MySQL database
 check_variables_mysql() {
-    if [ ! -n "${DB_SERVER_SOCKET}" ]; then
+    if [ -n "${DB_SERVER_SOCKET}" ]; then
+        mysql_connect_args="-S ${DB_SERVER_SOCKET}"
+    else
         : ${DB_SERVER_HOST:="mysql-server"}
         : ${DB_SERVER_PORT:="3306"}
+        mysql_connect_args="-h ${DB_SERVER_HOST} -P ${DB_SERVER_PORT}"
     fi
 
     USE_DB_ROOT_USER=false
@@ -195,11 +198,6 @@ check_variables_mysql() {
 
     DB_SERVER_DBNAME=${MYSQL_DATABASE:-"zabbix"}
 
-    if [ ! -n "${DB_SERVER_SOCKET}" ]; then
-        mysql_connect_args="-h ${DB_SERVER_HOST} -P ${DB_SERVER_PORT}"
-    else
-        mysql_connect_args="-S ${DB_SERVER_SOCKET}"
-    fi
 }
 
 db_tls_params() {
diff --git a/Dockerfiles/server-mysql/rhel/docker-entrypoint.sh b/Dockerfiles/server-mysql/rhel/docker-entrypoint.sh
index ed61897fe..d739d705f 100755
--- a/Dockerfiles/server-mysql/rhel/docker-entrypoint.sh
+++ b/Dockerfiles/server-mysql/rhel/docker-entrypoint.sh
@@ -156,9 +156,12 @@ file_process_from_env() {
 
 # Check prerequisites for MySQL database
 check_variables_mysql() {
-    if [ ! -n "${DB_SERVER_SOCKET}" ]; then
+    if [ -n "${DB_SERVER_SOCKET}" ]; then
+        mysql_connect_args="-S ${DB_SERVER_SOCKET}"
+    else
         : ${DB_SERVER_HOST:="mysql-server"}
         : ${DB_SERVER_PORT:="3306"}
+        mysql_connect_args="-h ${DB_SERVER_HOST} -P ${DB_SERVER_PORT}"
     fi
 
     USE_DB_ROOT_USER=false
@@ -195,11 +198,6 @@ check_variables_mysql() {
 
     DB_SERVER_DBNAME=${MYSQL_DATABASE:-"zabbix"}
 
-    if [ ! -n "${DB_SERVER_SOCKET}" ]; then
-        mysql_connect_args="-h ${DB_SERVER_HOST} -P ${DB_SERVER_PORT}"
-    else
-        mysql_connect_args="-S ${DB_SERVER_SOCKET}"
-    fi
 }
 
 db_tls_params() {
diff --git a/Dockerfiles/server-mysql/ubuntu/docker-entrypoint.sh b/Dockerfiles/server-mysql/ubuntu/docker-entrypoint.sh
index ed61897fe..d739d705f 100755
--- a/Dockerfiles/server-mysql/ubuntu/docker-entrypoint.sh
+++ b/Dockerfiles/server-mysql/ubuntu/docker-entrypoint.sh
@@ -156,9 +156,12 @@ file_process_from_env() {
 
 # Check prerequisites for MySQL database
 check_variables_mysql() {
-    if [ ! -n "${DB_SERVER_SOCKET}" ]; then
+    if [ -n "${DB_SERVER_SOCKET}" ]; then
+        mysql_connect_args="-S ${DB_SERVER_SOCKET}"
+    else
         : ${DB_SERVER_HOST:="mysql-server"}
         : ${DB_SERVER_PORT:="3306"}
+        mysql_connect_args="-h ${DB_SERVER_HOST} -P ${DB_SERVER_PORT}"
     fi
 
     USE_DB_ROOT_USER=false
@@ -195,11 +198,6 @@ check_variables_mysql() {
 
     DB_SERVER_DBNAME=${MYSQL_DATABASE:-"zabbix"}
 
-    if [ ! -n "${DB_SERVER_SOCKET}" ]; then
-        mysql_connect_args="-h ${DB_SERVER_HOST} -P ${DB_SERVER_PORT}"
-    else
-        mysql_connect_args="-S ${DB_SERVER_SOCKET}"
-    fi
 }
 
 db_tls_params() {