Traefik: “Bad Gateway” for Docker Service on a Swarm Node – what to do?

I recently ran into the problem, that suddenly one of my nodes had a “nervous breakdown” and it wasn’t accessible through traefik anymore. All that was printed on the page a “Bad Gateway”. But I was sure that it was working before, I didn’t change any settings.

I tried various solutions including adding a new overlay network to traefik and the services on the problematic node. Nothing would work. So in the end I drained and restarted the node, after which the problem was gone. The commands to do so on an Ubuntu instance would be:

docker node ls # to find the name/id of the node
docker node update --availability drain worker1

# after all containers are removed
sudo reboot

Afterwards, you can simply rescale/redeploy some of your services to repopulate the instance. There currently isn’t any “rebalance” command, because the Docker team doesn’t like the idea of killing healthy containers too much.

One Reply to “Traefik: “Bad Gateway” for Docker Service on a Swarm Node – what to do?”

  1. Thanks for sharing! Solved the problem for us!!
    I could add – because I was wondering before applying your procedure – that docker volumes still here and ready to be used after drain + reboot + active actions

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