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doc: updated rbd-mirror daemon instructions

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Fixes: http://tracker.ceph.com/issues/20701
Signed-off-by: Jason Dillaman <dillaman@redhat.com>
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Jason Dillaman 2017-08-08 12:43:32 -04:00
parent 34ff1ddca1
commit b7ba3f68c3
1 changed files with 14 additions and 3 deletions
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17
doc/rbd/rbd-mirroring.rst
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@ -288,13 +288,24 @@ distribution package.
.. important:: Each ``rbd-mirror`` daemon requires the ability to connect
to both clusters simultaneously.
.. warning:: Only run a single ``rbd-mirror`` daemon per Ceph cluster. A
future Ceph release will add support for horizontal scale-out of the
``rbd-mirror`` daemon.
.. warning:: Pre-Luminous releases: only run a single ``rbd-mirror`` daemon per
Ceph cluster.
Each ``rbd-mirror`` daemon should use a unique Ceph user ID. To
`create a Ceph user`_, with ``ceph`` specify the ``auth get-or-create``
command, user name, monitor caps, and OSD caps::
ceph auth get-or-create client.rbd-mirror.{unique id} mon 'profile rbd' osd 'profile rbd'
The ``rbd-mirror`` daemon can be managed by ``systemd`` by specifying the user
ID as the daemon instance::
systemctl enable ceph-rbd-mirror@rbd-mirror.{unique id}
.. _rbd: ../../man/8/rbd
.. _ceph-conf: ../../rados/configuration/ceph-conf/#running-multiple-clusters
.. _explicitly enabled: #enable-image-mirroring
.. _force resync command: #force-image-resync
.. _demote the image: #image-promotion-and-demotion
.. _create a Ceph user: ../../rados/operations/user-management#add-a-user