The externall network cannot be attached from inside the compose file

tasks/haproxy-docker-service.yml

@@ -31,5 +31,10 @@
         - '{{ haproxy_docker_compose_dir }}/docker-haproxy-stack.yml'
     run_once: True
 
+  - name: Connect haproxy to the external network
+    command: docker service update --network-add {{ haproxy_docker_overlay_network }} haproxy_haproxy --update-delay 30s --update-parallelism 1
+    run_once: True
+    ignore_errors: True
+
   when: docker_swarm_manager_main_node is defined and docker_swarm_manager_main_node | bool
   tags: [ 'haproxy', 'docker_haproxy', 'docker_swarm', 'docker' ]

templates/haproxy-docker-stack.yml.j2

@@ -7,8 +7,6 @@ services:
       - {{ haproxy_cert_dir }}:{{ haproxy_cert_dir }}:ro
       - /etc/haproxy:/usr/local/etc/haproxy:ro
       - /var/run/docker.sock:/var/run/docker.sock
-    networks:
-      - {{ haproxy_docker_overlay_network }}
     ports:
       - target: {{ haproxy_default_port }}
         published: {{ haproxy_default_port }}