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67 lines
2.1 KiB
ReStructuredText
67 lines
2.1 KiB
ReStructuredText
==================
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Create a Cluster
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==================
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The first step in using Ceph with ``ceph-deploy`` is to create a new Ceph
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cluster. A new Ceph cluster has:
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- A Ceph configuration file, and
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- A monitor keyring.
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The Ceph configuration file consists of at least:
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- Its own filesystem ID (``fsid``)
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- The initial monitor(s) hostname(s), and
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- The initial monitor(s) and IP address(es).
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For additional details, see the `Monitor Configuration Reference`_.
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The ``ceph-deploy`` tool also creates a monitor keyring and populates it with a
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``[mon.]`` key. For additional details, see the `Cephx Guide`_.
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Usage
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-----
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To create a cluster with ``ceph-deploy``, use the ``new`` command and specify
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the host(s) that will be initial members of the monitor quorum. ::
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ceph-deploy new {host [host], ...}
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For example::
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ceph-deploy new mon1.foo.com
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ceph-deploy new mon{1,2,3}
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The ``ceph-deploy`` utility will use DNS to resolve hostnames to IP
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addresses. The monitors will be named using the first component of
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the name (e.g., ``mon1`` above). It will add the specified host names
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to the Ceph configuration file. For additional details, execute::
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ceph-deploy new -h
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Naming a Cluster
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----------------
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By default, Ceph clusters have a cluster name of ``ceph``. You can specify
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a cluster name if you want to run multiple clusters on the same hardware. For
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example, if you want to optimize a cluster for use with block devices, and
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another for use with the gateway, you can run two different clusters on the same
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hardware if they have a different ``fsid`` and cluster name. ::
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ceph-deploy --cluster {cluster-name} new {host [host], ...}
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For example::
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ceph-deploy --cluster rbdcluster new ceph-mon1
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ceph-deploy --cluster rbdcluster new ceph-mon{1,2,3}
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.. note:: If you run multiple clusters, ensure you adjust the default
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port settings and open ports for your additional cluster(s) so that
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the networks of the two different clusters don't conflict with each other.
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.. _Monitor Configuration Reference: ../../configuration/mon-config-ref
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.. _Cephx Guide: ../../operations/authentication#monitor-keyrings
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