Adding upstream version 18.2.2.upstream/18.2.2

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 61 insertions, 0 deletions

diff --git a/doc/cephadm/services/mds.rst b/doc/cephadm/services/mds.rst
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+===========
+MDS Service
+===========
+
+
+.. _orchestrator-cli-cephfs:
+
+Deploy CephFS
+=============
+
+One or more MDS daemons is required to use the :term:`CephFS` file system.
+These are created automatically if the newer ``ceph fs volume``
+interface is used to create a new file system. For more information,
+see :ref:`fs-volumes-and-subvolumes`.
+
+For example:
+
+.. prompt:: bash #
+
+  ceph fs volume create <fs_name> --placement="<placement spec>"
+
+where ``fs_name`` is the name of the CephFS and ``placement`` is a
+:ref:`orchestrator-cli-placement-spec`. For example, to place
+MDS daemons for the new ``foo`` volume on hosts labeled with ``mds``:
+
+.. prompt:: bash #
+
+  ceph fs volume create foo --placement="label:mds"
+
+You can also update the placement after-the-fact via:
+
+.. prompt:: bash #
+
+  ceph orch apply mds foo 'mds-[012]'
+
+For manually deploying MDS daemons, use this specification:
+
+.. code-block:: yaml
+
+    service_type: mds
+    service_id: fs_name
+    placement:
+      count: 3
+      label: mds
+
+
+The specification can then be applied using:
+
+.. prompt:: bash #
+
+   ceph orch apply -i mds.yaml
+
+See :ref:`orchestrator-cli-stateless-services` for manually deploying
+MDS daemons on the CLI.
+
+Further Reading
+===============
+
+* :ref:`ceph-file-system`
+
+