Problem: App upgrade stucks in removing old container

Problem:

A dockerized app (f.e. nextcloud) can not be updated.
univention-app upgrade nextcloud
stucks in

removing the old container

ps aufx |grep rm shows

root 2998 0.1 0.6 500756 48632 pts/6 Sl+ 10:47 0:00 _ docker rm f06bc517e692b802acf3530c5918b3c7f1fa2ba100744324ae2e1abecd98935a

CONTAINER ID IMAGE COMMAND CREATED STATUS
f06bc517e692 docker.software-univention.de/nextcloud:20.0.2-0 “/bin/sh -c /usr/sbi…” 4 weeks ago removing in Progress

Maybe the io increases rapidly

Investigation

You can also check for older image versions
docker image list
which you might want to remove
docker image rm e4957a53f50e

Solution:

While the app upgrade process is running you can move the to be deleted container and restart the docker service

mv /var/lib/docker/containers/f06bc517e692b802acf3530c5918b3c7f1fa2ba100744324ae2e1abecd98935a/ ~/univention-support/
systemctl restart docker.service
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