[Bug 1546214] [NEW] Docker containers lose their cgroup after systemd reload

PierreF pierre-fersing at pierref.org
Tue Feb 16 17:20:51 UTC 2016


Public bug reported:


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.

** Affects: docker.io (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: systemd (Ubuntu)
     Importance: Undecided
         Status: New

** Also affects: docker.io (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1546214

Title:
  Docker containers lose their cgroup after systemd reload

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