constraints

swarm/docker-stack.yml

@@ -7,6 +7,9 @@ services:
       replicas: 1
       restart_policy:
         condition: on-failure
+      placement:
+        constraints:
+          - node.labels.role == worker
     environment:
       MYSQL_ROOT_PASSWORD: wordpress
       MYSQL_DATABASE: wordpress
@@ -35,6 +38,9 @@ services:
       replicas: 3
       restart_policy: 
         condition: on-failure
+      placement:
+        constraints:
+          - node.labels.role == worker
 
 volumes:
   db_data: