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Merge pull request #39916 from zdover23/wip-doc-cephadm-adoption-preparation-2021-Mar-08

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doc/cephadm: rewrite "preparation" in adoption.rst

Reviewed-by: Sebastian Wagner <sebastian.wagner@suse.com>
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@ -20,37 +20,40 @@ Limitations
Preparation
-----------
#. Get the ``cephadm`` command line tool on each host in the existing
cluster. See :ref:`get-cephadm`.
#. Make sure that the ``cephadm`` command line tool is available on each host
in the existing cluster. See :ref:`get-cephadm` to learn how.
#. Prepare each host for use by ``cephadm``:
#. Prepare each host for use by ``cephadm`` by running this command:
.. prompt:: bash #
cephadm prepare-host
#. Determine which Ceph version you will use. You can use any Octopus (15.2.z)
release or later. For example, ``docker.io/ceph/ceph:v15.2.0``. The default
will be the latest stable release, but if you are upgrading from an earlier
release at the same time be sure to refer to the upgrade notes for any
special steps to take while upgrading.
#. Choose a version of Ceph to use for the conversion. This procedure will work
with any release of Ceph that is Octopus (15.2.z) or later, inclusive. The
latest stable release of Ceph is the default. You might be upgrading from an
earlier Ceph release at the same time that you're performing this
conversion; if you are upgrading from an earlier release, make sure to
follow any upgrade-releated instructions for that release.
The image is passed to cephadm with:
Pass the image to cephadm with the following command:
.. prompt:: bash #
cephadm --image $IMAGE <rest of command goes here>
#. Cephadm can provide a list of all Ceph daemons on the current host:
The conversion begins.
#. Confirm that the conversion is underway by running ``cephadm ls`` and
making sure that the style of the daemons is changed:
.. prompt:: bash #
cephadm ls
Before starting, you should see that all existing daemons have a
style of ``legacy`` in the resulting output. As the adoption
process progresses, adopted daemons will appear as style
``cephadm:v1``.
Before starting the converstion process, ``cephadm ls`` shows all existing
daemons to have a style of ``legacy``. As the adoption process progresses,
adopted daemons will appear with a style of ``cephadm:v1``.
Adoption process