mirror of https://github.com/ceph/ceph-ansible.git
60 lines
2.7 KiB
ReStructuredText
60 lines
2.7 KiB
ReStructuredText
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RBD Mirroring
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=============
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There's not so much to do from the primary cluster side in order to setup an RBD mirror replication.
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``ceph_rbd_mirror_configure`` has to be set to ``true`` to make ceph-ansible create the mirrored pool
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defined in ``ceph_rbd_mirror_pool`` and the keyring that is going to be used to add the rbd mirror peer.
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group_vars from the primary cluster:
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.. code-block:: yaml
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ceph_rbd_mirror_configure: true
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ceph_rbd_mirror_pool: rbd
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Optionnally, you can tell ceph-ansible to set the name and the secret of the keyring you want to create:
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.. code-block:: yaml
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ceph_rbd_mirror_local_user: client.rbd-mirror-peer # 'client.rbd-mirror-peer' is the default value.
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ceph_rbd_mirror_local_user_secret: AQC+eM1iKKBXFBAAVpunJvqpkodHSYmljCFCnw==
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This secret will be needed to add the rbd mirror peer from the secondary cluster.
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If you do not enforce it as shown above, you can get it from a monitor by running the following command:
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``ceph auth get {{ ceph_rbd_mirror_local_user }}``
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.. code-block:: shell
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$ sudo ceph auth get client.rbd-mirror-peer
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Once your variables are defined, you can run the playbook (you might want to run with --limit option):
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.. code-block:: shell
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$ ansible-playbook -vv -i hosts site-container.yml --limit rbdmirror0
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The configuration of the rbd mirror replication strictly speaking is done on the secondary cluster.
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The rbd-mirror daemon pulls the data from the primary cluster. This is where the rbd mirror peer addition has to be done.
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The configuration is similar with what was done on the primary cluster, it just needs few additional variables.
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``ceph_rbd_mirror_remote_user`` : This user must match the name defined in the variable ``ceph_rbd_mirror_local_user`` from the primary cluster.
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``ceph_rbd_mirror_remote_mon_hosts`` : This must a comma separated list of the monitor addresses from the primary cluster.
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``ceph_rbd_mirror_remote_key`` : This must be the same value as the user (``{{ ceph_rbd_mirror_local_user }}``) keyring secret from the primary cluster.
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group_vars from the secondary cluster:
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.. code-block:: yaml
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ceph_rbd_mirror_configure: true
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ceph_rbd_mirror_pool: rbd
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ceph_rbd_mirror_remote_user: client.rbd-mirror-peer # This must match the value defined in {{ ceph_rbd_mirror_local_user }} on primary cluster.
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ceph_rbd_mirror_remote_mon_hosts: 1.2.3.4
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ceph_rbd_mirror_remote_key: AQC+eM1iKKBXFBAAVpunJvqpkodHSYmljCFCnw== # This must match the secret of the registered keyring of the user defined in {{ ceph_rbd_mirror_local_user }} on primary cluster.
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Once you variables are defined, you can run the playbook (you might want to run with --limit option):
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.. code-block:: shell
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$ ansible-playbook -vv -i hosts site-container.yml --limit rbdmirror0
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