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doc/ceph-volume systemd describe the interaction with 'simple' activation

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Signed-off-by: Alfredo Deza <adeza@redhat.com>
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Alfredo Deza 2017-11-07 13:42:45 -05:00
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doc/ceph-volume/simple/systemd.rst Normal file
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.. _ceph-volume-simple-systemd:
systemd
=======
Upon startup, it will identify the logical volume by loading the JSON file in
``/etc/ceph/osd/{id}-{uuid}.json`` corresponding to the instance name of the
systemd unit.
After identifying the correct volume it will then proceed to mount it by using
the OSD destination conventions, that is::
/var/lib/ceph/osd/{cluster name}-{osd id}
For our example OSD with an id of ``0``, that means the identified device will
be mounted at::
/var/lib/ceph/osd/ceph-0
Once that process is complete, a call will be made to start the OSD::
systemctl start ceph-osd@0
The systemd portion of this process is handled by the ``ceph-volume simple
trigger`` sub-command, which is only in charge of parsing metadata coming from
systemd and startup, and then dispatching to ``ceph-volume simple activate`` which
would proceed with activation.