This is not a docker bug it affects any type of cgroup made anywhere in the cgroup hierarchy.
Ex: I have service A that forks off child B. I place B in a cgroup that I made at /sys/fs/cgroup/cpu/mycgroup. Reload and restart a service and boom, systemd deletes /sys/fs/cgroup/cpu/mycgroup. /sys/fs/cgroup is not even in any of the systemd controlled cgroup paths, it's just nuking things in the cgroup root that it did not create. Also this is a security issue. -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to systemd in Ubuntu. https://bugs.launchpad.net/bugs/1546214 Title: Docker containers lose their cgroup after systemd reload Status in docker.io package in Ubuntu: Confirmed Status in systemd package in Ubuntu: Confirmed Bug description: After a Systemd reload & any service restart, docker top no longer show process of containers: To reproduce this issue, do the following step: # docker run -d --name test busybox sleep 1d # docker top test UID PID PPID C STIME TTY TIME CMD root 26416 1072 1 18:05 ? 00:00:00 sleep 1d # systemctl --system daemon-reload && systemctl restart atd.service # docker top test UID PID PPID C STIME TTY TIME CMD [ no process listed... but sleep is still running] Note: this idea of restarting any service restart come from patch https://lists.freedesktop.org/archives/systemd- devel/2014-September/023276.html (which is applied to Systemd package in Ubuntu) After few searching, this seems to be due to process from the container being moved in other cgroup by Systemd. More details on https://github.com/docker/docker/issues/20152 Depending on version of Systemd (Wily or Xenial), this issue: * Wily: Happend with Docker 1.10 (with default option) * Wily: Does NOT happend with Docker 1.10 and --exec-opt native.cgroupdriver=systemd * Wily: Does NOT happend with Docker 1.9 * Xenial: Does always happend (Docker 1.9, 1.10 with or without native.cgroupdriver=systemd) I don't know if this issue is a Systemd issue, a Docker issue... or in middle. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/docker.io/+bug/1546214/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
