On 08/06/2020 21:13, Matthieu Imbert via shifter-users wrote: > Hi, > > I'm trying to checkpoint a docker container running an xpra server, > which runs an x11 app (i'm currently testing with xcalc). > > My goal is to be able to checkpoint (and stop) the container, then > restart it later, and connect (through xpra) to the x11 app in the same > state as it was at the time of the checkpoint. OTOH, this should work.
> Under the hood, docker uses criu (https://criu.org/Main_Page) to do the > checkpointing. I understand that doing that directly with the x11 app is > not possible because there is part of the state which is inside the x11 > server, thus not accessible to criu, this is why I think that embedding > everything in a docker container with xpra might be the solution, > because everything is inside the container, so we may reasonably expect > that all relevant state will be saved with a docker checkpoint. > > For now, i'm able to checkpoint the container without error, and restart > the container from the checkpoint, but when the container is restarted, > xpra restarts from scratch (at least, this is what it looks like, when > looking at the container logs) and the x11 app is restarted as well, and > thus looses its state. There is nothing in xpra that auto-restarts a server, so you must have configured your checkpoint system to do that. FYI: both your client and server versions are out of date. > Do you have an idea of what goes wrong here, and is there a way to fix it? > > Here are the details of my test: everything is here: > https://github.com/mimbert/docker-xpra-criu-test with instructions on > how to reproduce. > > An execution log is here: > https://github.com/mimbert/docker-xpra-criu-test/blob/master/execution.log > line 66 is the moment I do the checkpoint > line 68 is the moment I restart the container > > (I also posted to the criu community) That's the best place to ask, as this does not look like a problem with xpra. Cheers, Antoine > > Cheers, > _______________________________________________ shifter-users mailing list shifter-users@lists.devloop.org.uk https://lists.devloop.org.uk/mailman/listinfo/shifter-users
