Public bug reported: It is possible to have an ephemeral container remaining after lxc-start- ephemeral has been killed--trivially by calling kill -9 on lxc-start- ephemeral. At that point, the script does not get a chance to clean up after itself, and the system is left with a running ephemeral container as well as several mounts.
lxc-stop can stop the container, but after an ephemeral container is stopped, it ought to be destroyed, and it is not. Moreover, if you then try to use lxc-destroy, it will fail, because the ephemeral container's directory is mounted, with another directory mounted inside (ephemeralbind). Moreover again, if you succeed in umounting those directories, and then destroying the container, there is still a tmpfs "/tmp/lxc-lp-XXXXXXX" directory (I suspect that "lp" segment of the name is no longer appropriate, btw) hidden away consuming undefined amounts amount of memory that would ideally have been removed for the user. We have a script to handle this possibility in an automated way. Beyond handling the above, it does one more thing that lxc-stop can't do now: it finds all of the ephemeral containers via a glob, to allow the automated script to not have to know what temporary name the ephemeral container has. An equivalent would be "lxc-stop -n lptests-tmp-*". It would be nice if lxc-stop could handle properly destroying ephemeral containers when they are stopped. (Perhaps this could even be a step along the way to the non-COMMAND version of lxc-start-ephemeral ending simply with either lxc-start -n $NAME or lxc-start -d -n $NAME.) It would be even more nice if lxc-stop could handle globs, so we could do away with our script. The least obvious aspect of the implementation I see is how to know what /tmp/lxc-lp-* directory to remove. The best I can come up with is parsing the output of "mount" to find the tmp directory used as the "upperdir" for the primary overlayfs. This would be a bit more lines of code if you wanted to support aufs, but still doable. If it's not already clear, I personally consider this a low priority nice-to-have. Thank you ** Affects: lxc (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/969604 Title: lxc-stop should be able to handle ephemeral containers more robustly To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/lxc/+bug/969604/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs