I upgraded my server (debian 8.5) a few days ago via apt-get. docker-engine was updated. I use docker only for discourse. The discourse container did not restart after updating. Manually restarting fails with
/var/discourse# ./launcher restart app
/usr/bin/docker: Error response from daemon: rpc error: code = 2 desc = "shim error: invalid argument".
Your Docker installation is not working correctly
The link provided does not help or I don't understand. I found some threads around here and tried
/var/discourse# git pull
./launcher rebuild app
but this failed with the same result.
Thanks for any help on how to fix or debug this.