Bug 1419871

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:


Steps to Reproduce:
1.
2.
3.

Actual results:


Expected results:


Additional info: