Re: Question about how to start ceph OSDs with systemd

Ernst Pijper <ernst.pijper@xxxxxxxxxxx> · Mon, 11 Jul 2016 11:12:40 +0200

Hi Manual,
This is a well known issue. You are definitely not the first one to hit this problem. Before Jewel i (and other as well) added the line

ceph-disk activate all

to /etc/rc.local to get the OSD’s running at boot. In Jewel, however, this doesn’t work anymore. Now i add these line to /etc/rc.local

for dev in $(ceph-disk list | grep "ceph journal" | awk '{print $1}')
do
   ceph-disk trigger $dev
done

The OSD’s are now automatically mounted and started. After this, the systemctl commands also work.

Ernst

On 8 jul. 2016, at 17:59, Manuel Lausch <manuel.lausch@xxxxxxxx> wrote:

hi,

In the last days I do play around with ceph jewel on debian Jessie and CentOS 7. Now I have a question about systemd on this Systems.

I installed ceph jewel (ceph version 10.2.2 (45107e21c568dd033c2f0a3107dec8f0b0e58374)) on debian Jessie and prepared some OSDs. While playing around I decided to reinstall my operating system (of course without deleting the OSD devices ). After the reinstallation of ceph and put in the old ceph.conf I thought the previously prepared OSDs do easily start and all will be fine after that.

With debian Wheezy and ceph firefly this worked well, but with the new versions and systemd this doesn't work at all. Now what have I to do to get the OSDs running again?

The following command didn't work and I didn't get any output from it.
  systemctl start ceph-osd.target

And this is the output from systemctl status ceph-osd.target
● ceph-osd.target - ceph target allowing to start/stop all ceph-osd@.service instances at once
   Loaded: loaded (/usr/lib/systemd/system/ceph-osd.target; enabled; vendor preset: enabled)
   Active: active since Fri 2016-07-08 17:19:29 CEST; 36min ago

Jul 08 17:19:29 cs-dellbrick01.server.lan systemd[1]: Reached target ceph target allowing to start/stop all ceph-osd@.service instances at once.
Jul 08 17:19:29 cs-dellbrick01.server.lan systemd[1]: Starting ceph target allowing to start/stop all ceph-osd@.service instances at once.
Jul 08 17:31:15 cs-dellbrick01.server.lan systemd[1]: Reached target ceph target allowing to start/stop all ceph-osd@.service instances at once.

thanks,
Manuel

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