deploy error:

TASK: [neutron | Starting neutron-dhcp-agent container] ***********************
failed: [cpn00013] => {"changed": true, "failed": true}
msg: APIError(HTTPError(u'500 Server Error: Internal Server Error for url: http+docker://localunixsocket/v1.22/containers/neutron_dhcp_agent/start',),)
failed: [cpn00011] => {"changed": true, "failed": true}
msg: APIError(HTTPError(u'500 Server Error: Internal Server Error for url: http+docker://localunixsocket/v1.22/containers/neutron_dhcp_agent/start',),)
failed: [cpn00012] => {"changed": true, "failed": true}
msg: APIError(HTTPError(u'500 Server Error: Internal Server Error for url: http+docker://localunixsocket/v1.22/containers/neutron_dhcp_agent/start',),)

FATAL: all hosts have already failed -- aborting

docker.service has been updated with "shared"
service restarted
container start still fails

[root@cpn00012 kolla]# grep shared /lib/systemd/system/docker.service
MountFlags=shared
[root@cpn00012 kolla]# ps -ef | grep docker
root      617446       1  1 15:26 ?        00:00:09 /usr/bin/docker daemon -H fd://
root      623474  346473  0 15:36 pts/1    00:00:00 grep --color=auto docker
[root@cpn00012 kolla]# docker start neutron_dhcp_agent
Error response from daemon: Cannot start container 2ded000ecd14556245f93089eb85f11cdbbb7875f9c3b82e2b78a41584897456: Path /run/netns is mounted on /run but it is not a shared mount.
Error: failed to start containers: neutron_dhcp_agent
[root@cpn00012 kolla]# cat /proc/self/mountinfo  | grep run
24 60 0:19 / /run rw,nosuid,nodev shared:21 - tmpfs tmpfs rw,mode=755
101 24 0:35 / /run/user/0 rw,nosuid,nodev,relatime shared:55 - tmpfs tmpfs rw,size=79218136k,mode=700

precheck ran ok after I did the update to docker.service.