`docker services ls` shows running services but `docker ps -a` is missing running containers? Where are the other missing running containers listed?

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The wordpress service is running confirmed by docker service ls and the blog is up when visiting the blog url (which gets taken down after executing docker stack rm wordpress).

Once wordpress is deployed using docker stack deploy the stack looks like this:

user@prod:~/wordpress$ docker service ls
ID             NAME                  MODE         REPLICAS   IMAGE              PORTS
ph38i5su9slr   traefik_traefik       replicated   1/1        traefik:v2.4
yhu02cqufy8l   wordpress_db          replicated   1/1        mysql:5.7
v4q2ztqwv118   wordpress_wordpress   replicated   1/1        wordpress:latest

user@prod:~/wordpress$ docker ps -a
CONTAINER ID   IMAGE          COMMAND                  CREATED      STATUS      PORTS                                                                      NAMES
697cf6cfa806   traefik:v2.4   "/entrypoint.sh --pr…"   4 days ago   Up 4 days   0.0.0.0:80->80/tcp, :::80->80/tcp, 0.0.0.0:443->443/tcp, :::443->443/tcp   traefik_traefik.1.i4txtjd2p0rcbnpd3bkv54eo2

Why are the wordpress containers not showing up in docker ps -a?

docker-swarm docker-compose docker
1 Answers

You're using Docker Swarm which can run over multiple nodes in cluster mode.

A plausible scenario is that traefik is running on the node where you're executing the docker ps -a command and the other containers are running on different node/s.

To confirm that there is more than one node you can try and execute docker node ls. I can't think of any other scenario where you have a running service, but only one of the containers is visible (and you have a single host).

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