diff --git a/selenium/bin/components/devkeycloak-proxy b/selenium/bin/components/devkeycloak-proxy
index 18ddbe209cc..6841cea43d3 100644
--- a/selenium/bin/components/devkeycloak-proxy
+++ b/selenium/bin/components/devkeycloak-proxy
@@ -1,3 +1,5 @@
+#!/usr/bin/env bash
+
 HTTPD_DOCKER_IMAGE=${HTTPD_DOCKER_IMAGE:-httpd:latest}
 
 ensure_devkeycloak-proxy() {
diff --git a/selenium/bin/components/forward-proxy b/selenium/bin/components/forward-proxy
index 06ed2c4f110..dffcc94e180 100644
--- a/selenium/bin/components/forward-proxy
+++ b/selenium/bin/components/forward-proxy
@@ -1,3 +1,5 @@
+#!/usr/bin/env bash
+
 HTTPD_DOCKER_IMAGE=${HTTPD_DOCKER_IMAGE:-httpd:latest}
 
 ensure_forward-proxy() {
diff --git a/selenium/bin/components/mock-auth-backend-http b/selenium/bin/components/mock-auth-backend-http
index e02622357bc..6cdc30e58c3 100644
--- a/selenium/bin/components/mock-auth-backend-http
+++ b/selenium/bin/components/mock-auth-backend-http
@@ -1,5 +1,7 @@
 #!/usr/bin/env bash
 
+MOCKSERVER_DOCKER_IMAGE=${MOCKSERVER_DOCKER_IMAGE:-mockserver/mockserver}
+
 ensure_mock-auth-backend-http() {
   if docker ps | grep mock-auth-backend-http &> /dev/null; then
      print "mock-auth-backend-http already running ..."
@@ -10,7 +12,6 @@ ensure_mock-auth-backend-http() {
 init_mock-auth-backend-http() {
   AUTH_BACKEND_HTTP_BASEURL=${AUTH_BACKEND_HTTP_BASEURL:-http://localhost:8888}
   AUTH_BACKEND_HTTP_DIR=${TEST_CASES_DIR}/mock-auth-backend-http
-  MOCKSERVER_DOCKER_IMAGE=${MOCKSERVER_DOCKER_IMAGE:-mockserver/mockserver}
 
   print "> AUTH_BACKEND_HTTP_BASEURL: ${AUTH_BACKEND_HTTP_BASEURL}"
   print "> AUTH_BACKEND_HTTP_DIR: ${AUTH_BACKEND_HTTP_DIR}"
diff --git a/selenium/bin/components/mock-auth-backend-ldap b/selenium/bin/components/mock-auth-backend-ldap
index abe6837be54..4be06208ba6 100644
--- a/selenium/bin/components/mock-auth-backend-ldap
+++ b/selenium/bin/components/mock-auth-backend-ldap
@@ -1,5 +1,7 @@
 #!/usr/bin/env bash
 
+OPENLDAP_DOCKER_IMAGE=${OPENLDAP_DOCKER_IMAGE:-osixia/openldap:1.5.0}
+
 ensure_mock-auth-backend-ldap() {
   if docker ps | grep mock-auth-backend-ldap &> /dev/null; then
      print "mock-auth-backend-ldap already running ..."
@@ -9,7 +11,6 @@ ensure_mock-auth-backend-ldap() {
 }
 init_mock-auth-backend-ldap() {
   AUTH_BACKEND_LDAP_DIR=${TEST_CONFIG_DIR}/mock-auth-backend-ldap
-  OPENLDAP_DOCKER_IMAGE=${OPENLDAP_DOCKER_IMAGE:-osixia/openldap:1.5.0}
 
   print "> AUTH_BACKEND_LDAP_DIR: ${AUTH_BACKEND_LDAP_DIR}"
   print "> OPENLDAP_DOCKER_IMAGE: ${OPENLDAP_DOCKER_IMAGE}"
diff --git a/selenium/bin/components/other-rabbitmq b/selenium/bin/components/other-rabbitmq
index 473071cca4f..7ed61e33146 100644
--- a/selenium/bin/components/other-rabbitmq
+++ b/selenium/bin/components/other-rabbitmq
@@ -2,10 +2,10 @@
 
 SCRIPT="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
 
+RABBITMQ_DOCKER_IMAGE=${RABBITMQ_DOCKER_IMAGE:-rabbitmq}
 
 init_other_rabbitmq() {
   RABBITMQ_CONFIG_DIR=${TEST_CONFIG_DIR}
-  RABBITMQ_DOCKER_IMAGE=${RABBITMQ_DOCKER_IMAGE:-rabbitmq}
   OTHER_RABBITMQ_HOSTNAME=${OTHER_RABBITMQ_HOSTNAME:-other-rabbitmq}
 
   print "> RABBITMQ_CONFIG_DIR: ${RABBITMQ_CONFIG_DIR}"
diff --git a/selenium/bin/components/prodkeycloak-proxy b/selenium/bin/components/prodkeycloak-proxy
index ad4f70b6ca0..005d912bbc5 100644
--- a/selenium/bin/components/prodkeycloak-proxy
+++ b/selenium/bin/components/prodkeycloak-proxy
@@ -1,3 +1,5 @@
+#!/usr/bin/env bash
+
 HTTPD_DOCKER_IMAGE=${HTTPD_DOCKER_IMAGE:-httpd:latest}
 
 ensure_prodkeycloak-proxy() {
diff --git a/selenium/bin/components/proxy b/selenium/bin/components/proxy
index c797c4d797a..90e33494df7 100644
--- a/selenium/bin/components/proxy
+++ b/selenium/bin/components/proxy
@@ -1,3 +1,5 @@
+#!/usr/bin/env bash
+
 HTTPD_DOCKER_IMAGE=${HTTPD_DOCKER_IMAGE:-httpd:latest}
 
 ensure_proxy() {
diff --git a/selenium/bin/components/rabbitmq b/selenium/bin/components/rabbitmq
index 2157ef7f18c..104bc30e5c4 100644
--- a/selenium/bin/components/rabbitmq
+++ b/selenium/bin/components/rabbitmq
@@ -2,10 +2,10 @@
 
 SCRIPT="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
 
+RABBITMQ_DOCKER_IMAGE=${RABBITMQ_DOCKER_IMAGE:-rabbitmq}
 
 init_rabbitmq() {
   RABBITMQ_CONFIG_DIR=${TEST_CONFIG_DIR}
-  RABBITMQ_DOCKER_IMAGE=${RABBITMQ_DOCKER_IMAGE:-rabbitmq}
 
   print "> RABBITMQ_CONFIG_DIR: ${RABBITMQ_CONFIG_DIR}"
   print "> RABBITMQ_DOCKER_IMAGE: ${RABBITMQ_DOCKER_IMAGE}"