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Description of problem:
In docker 1.12 docker live restore should work, keeping docker containers live when restarting docker daemon.
https://docs.docker.com/engine/admin/live-restore/
But it does not seem to work out of the box in RHEL 7.3. I had to add some lines to /usr/lib/systemd/system/docker.service
<snip>
# set delegate yes so that systemd does not reset the cgroups of docker containers
Delegate=yes
# kill only the docker process, not all processes in the cgroup
KillMode=process
</snip>
As described in this issue
https://github.com/docker/machine/issues/3963
After adding this I can restart the docker daemon with out containers restarting.
Version-Release number of selected component (if applicable):
[root@osemaster1 docker]# docker version
Client:
Version: 1.12.5
API version: 1.24
Package version: docker-common-1.12.5-14.el7.x86_64
Go version: go1.7.4
Git commit: 047e51b/1.12.5
Built: Wed Jan 11 17:53:20 2017
OS/Arch: linux/amd64
Server:
Version: 1.12.5
API version: 1.24
Package version: docker-common-1.12.5-14.el7.x86_64
Go version: go1.7.4
Git commit: 047e51b/1.12.5
Built: Wed Jan 11 17:53:20 2017
OS/Arch: linux/amd64
[root@osemaster1 docker]#
How reproducible:
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Expected results:
Additional info: