ceph-mon not starting on boot with systemd and Ubuntu 16.04

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Hi,

I am setting up a Jewel cluster in VMs with Ubuntu 16.04.

ceph version 10.2.0 (3a9fba20ec743699b69bd0181dd6c54dc01c64b9)

After a reboot the Ceph Monitors don't start and I have to do so manually.

Three machines, alpha, bravo and charlie all have the same problem.

root@charlie:~# systemctl status ceph-mon@charlie
● ceph-mon@charlie.service - Ceph cluster monitor daemon
   Loaded: loaded (/lib/systemd/system/ceph-mon@.service; enabled; vendor preset: enabled)
   Active: inactive (dead)
root@charlie:~#

I can start it and it works

root@charlie:~# systemctl start ceph-mon@charlie
root@charlie:~# systemctl status ceph-mon@charlie
● ceph-mon@charlie.service - Ceph cluster monitor daemon
   Loaded: loaded (/lib/systemd/system/ceph-mon@.service; enabled; vendor preset: enabled)
   Active: active (running) since Thu 2016-05-12 16:08:56 CEST; 1s ago
 Main PID: 1368 (ceph-mon)

I tried removing the /var/log/ceph/ceph-mon.charlie.log file and reboot to see if the mon was actually invoked, but it wasn't.

ceph.target has been started and so is the OSD on the machine. It is just the monitor which hasn't been started.

In the syslog I see:

May 12 16:11:19 charlie systemd[1]: Starting Ceph object storage daemon...
May 12 16:11:19 charlie systemd[1]: Starting LSB: Start Ceph distributed file system daemons at boot time...
May 12 16:11:19 charlie systemd[1]: Started LSB: Start Ceph distributed file system daemons at boot time.
May 12 16:11:20 charlie systemd[1]: Started Ceph object storage daemon.
May 12 16:11:20 charlie systemd[1]: Started Ceph disk activation: /dev/sdb2.
May 12 16:11:21 charlie systemd[1]: Started Ceph object storage daemon.
May 12 16:11:21 charlie systemd[1]: Started Ceph disk activation: /dev/sdb1.

Am I missing something or is this a bug?

Wido
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