Traefik returns 500 Bad Gateway after updating environment variables in Docker Stack

[Rekwian]

Hello,

on a stack project (create compose ⇒ compose type : stack) I'm using a "raw compose" with this :

services:
  app:
    container_name: adminer
    image: adminer
    environment:
      ABC: 123

On the initial deployment, everything works correctly and the application
returns a 200 response.

However, when I change the ABC environment variable (for example from 123
to 456) and redeploy the stack, the service starts returning a 500 Bad Gateway.

If I restart Traefik, the application works again immediately.

It looks like Traefik does not properly detect or refresh the service after
the stack update.

Did I miss something in my configuration, or could this be a known issue
with Traefik and Docker Swarm?

Thanks for your help.

[Guillaume351]

Hello,
I am having the same issue since a few weeks.
It worked no problems for a year before that.
Have you been able to find a solution ?

Thanks

[Rekwian]

I think so, yes.
I set the Traefik settings watch to true, but I’m not sure what the impact of that might be.
It would need to be tested over the long term.

Maybe I was using an older config and the newer ones already include watch: true.

providers:
  swarm:
    exposedByDefault: false
    watch: true

Maybe someone have an opinion on this ? @Siumauricio ?

[Guillaume351]

Thank you, seems to fix the issue for me. I will report back if I have any issue in the following weeks