diff --git a/aptly/server/docker.yml b/aptly/server/docker.yml
index 6038976..ee8f4a2 100644
--- a/aptly/server/docker.yml
+++ b/aptly/server/docker.yml
@@ -2,7 +2,10 @@
   - service.aptly.server.single
 parameters:
   _param:
-    aptly_server_secure: true
+    aptly_server_secure: false
+    aptly_gpg_keypair_id: none
+    aptly_gpg_public_key: none
+    aptly_gpg_private_key: none
   aptly:
     server:
       enabled: true
diff --git a/docker/swarm/service/aptly.yml b/docker/swarm/service/aptly.yml
index d85b1b4..5f6de6e 100644
--- a/docker/swarm/service/aptly.yml
+++ b/docker/swarm/service/aptly.yml
@@ -1,4 +1,8 @@
 parameters:
+  _param:
+    docker_image_aptly:
+      api: tcpcloud/aptly-api
+      public: tcpcloud/aptly-public
   docker:
     client:
       service:
diff --git a/docker/swarm/service/docker.yml b/docker/swarm/service/docker.yml
index a79fc08..d20b4db 100644
--- a/docker/swarm/service/docker.yml
+++ b/docker/swarm/service/docker.yml
@@ -1,4 +1,6 @@
 parameters:
+  _param:
+    docker_image_registry: registry:2
   docker:
     client:
       service:
diff --git a/docker/swarm/service/gerrit.yml b/docker/swarm/service/gerrit.yml
index d1bdfae..d33bdbb 100644
--- a/docker/swarm/service/gerrit.yml
+++ b/docker/swarm/service/gerrit.yml
@@ -1,4 +1,6 @@
 parameters:
+  _param:
+    docker_image_gerrit: tcpcloud/gerrit:2.12.7
   docker:
     client:
       service:
diff --git a/docker/swarm/service/jenkins.yml b/docker/swarm/service/jenkins.yml
index c0b0721..3069dc6 100644
--- a/docker/swarm/service/jenkins.yml
+++ b/docker/swarm/service/jenkins.yml
@@ -1,4 +1,6 @@
 parameters:
+  _param:
+    docker_image_jenkins: tcpcloud/jenkins:2.50
   docker:
     client:
       service:
diff --git a/docker/swarm/service/mysql.yml b/docker/swarm/service/mysql.yml
index 53faa8b..f94cf4d 100644
--- a/docker/swarm/service/mysql.yml
+++ b/docker/swarm/service/mysql.yml
@@ -1,4 +1,6 @@
 parameters:
+  _param:
+    docker_image_mysql: mysql:5.6
   docker:
     client:
       service:
@@ -10,7 +12,7 @@
             MYSQL_ROOT_PASSWORD: ${_param:mysql_admin_password}
           restart:
             condition: any
-          image: "mysql:5.6"
+          image: "${_param:docker_image_mysql}"
           ports:
             - 13306:3306
           volume:
diff --git a/docker/swarm/service/openldap.yml b/docker/swarm/service/openldap.yml
index d009ed5..e390772 100644
--- a/docker/swarm/service/openldap.yml
+++ b/docker/swarm/service/openldap.yml
@@ -1,4 +1,6 @@
 parameters:
+  _param:
+    docker_image_openldap: osixia/openldap:1.1.7
   docker:
     client:
       service:
@@ -7,7 +9,7 @@
           # https://github.com/docker/docker/issues/24877
           restart:
             condition: any
-          image: osixia/openldap:1.1.7
+          image: ${_param:docker_image_openldap}
           environment:
             HOSTNAME: ldap01.${_param:cluster_public_host}
             LDAP_ORGANISATION: "${_param:openldap_organisation}"
diff --git a/docker/swarm/service/visualizer.yml b/docker/swarm/service/visualizer.yml
index fe52c0b..8519363 100644
--- a/docker/swarm/service/visualizer.yml
+++ b/docker/swarm/service/visualizer.yml
@@ -1,11 +1,13 @@
 parameters:
+  _param:
+    docker_image_visualizer: manomarks/visualizer
   docker:
     client:
       service:
         visualizer:
           restart:
             condition: any
-          image: manomarks/visualizer
+          image: ${_param:docker_image_visualizer}
           constraint: "node.role==manager"
           ports:
             - 18090:8080