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Signed-off-by: Kefu Chai <kchai@redhat.com>
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91 lines
2.9 KiB
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==========================
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Block Device Quick Start
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==========================
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To use this guide, you must have executed the procedures in the `Storage
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Cluster Quick Start`_ guide first. Ensure your :term:`Ceph Storage Cluster` is
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in an ``active + clean`` state before working with the :term:`Ceph Block
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Device`.
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.. note:: The Ceph Block Device is also known as :term:`RBD` or :term:`RADOS`
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Block Device.
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.. ditaa::
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/------------------\ /----------------\
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| Admin Node | | ceph-client |
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| +-------->+ cCCC |
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| ceph-deploy | | ceph |
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\------------------/ \----------------/
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You may use a virtual machine for your ``ceph-client`` node, but do not
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execute the following procedures on the same physical node as your Ceph
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Storage Cluster nodes (unless you use a VM). See `FAQ`_ for details.
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Install Ceph
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============
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#. Verify that you have an appropriate version of the Linux kernel.
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See `OS Recommendations`_ for details. ::
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lsb_release -a
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uname -r
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#. On the admin node, use ``ceph-deploy`` to install Ceph on your
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``ceph-client`` node. ::
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ceph-deploy install ceph-client
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#. On the admin node, use ``ceph-deploy`` to copy the Ceph configuration file
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and the ``ceph.client.admin.keyring`` to the ``ceph-client``. ::
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ceph-deploy admin ceph-client
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The ``ceph-deploy`` utility copies the keyring to the ``/etc/ceph``
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directory. Ensure that the keyring file has appropriate read permissions
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(e.g., ``sudo chmod +r /etc/ceph/ceph.client.admin.keyring``).
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Create an rbd pool
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==================
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#. On the admin node, use the ``ceph`` tool to `Create a Pool`_
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(we recommend the name 'rbd').
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Configure a Block Device
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========================
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#. On the ``ceph-client`` node, create a block device image. ::
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rbd create foo --size 4096 [-m {mon-IP}] [-k /path/to/ceph.client.admin.keyring]
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#. On the ``ceph-client`` node, map the image to a block device. ::
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sudo rbd map foo --name client.admin [-m {mon-IP}] [-k /path/to/ceph.client.admin.keyring]
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#. Use the block device by creating a file system on the ``ceph-client``
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node. ::
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sudo mkfs.ext4 -m0 /dev/rbd/rbd/foo
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This may take a few moments.
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#. Mount the file system on the ``ceph-client`` node. ::
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sudo mkdir /mnt/ceph-block-device
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sudo mount /dev/rbd/rbd/foo /mnt/ceph-block-device
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cd /mnt/ceph-block-device
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#. Optionally configure the block device to be automatically mapped and mounted
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at boot (and unmounted/unmapped at shutdown) - see the `rbdmap manpage`_.
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See `block devices`_ for additional details.
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.. _Create a Pool: ../../rados/operations/pools#createpool
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.. _Storage Cluster Quick Start: ../quick-ceph-deploy
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.. _block devices: ../../rbd/rbd
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.. _FAQ: http://wiki.ceph.com/How_Can_I_Give_Ceph_a_Try
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.. _OS Recommendations: ../os-recommendations
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.. _rbdmap manpage: ../../man/8/rbdmap
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