ceph/doc/start/quick-rbd.rst

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==========================
Block Device Quick Start
==========================
To use this guide, you must have executed the procedures in the `Storage
Cluster Quick Start`_ guide first. Ensure your :term:`Ceph Storage Cluster` is
in an ``active + clean`` state before working with the :term:`Ceph Block
Device`.
.. note:: The Ceph Block Device is also known as :term:`RBD` or :term:`RADOS`
Block Device.
.. ditaa::
/------------------\ /----------------\
| Admin Node | | cephclient |
| +-------->+ cCCC |
| cephdeploy | | ceph |
\------------------/ \----------------/
You may use a virtual machine for your ``ceph-client`` node, but do not
execute the following procedures on the same physical node as your Ceph
Storage Cluster nodes (unless you use a VM). See `FAQ`_ for details.
Install Ceph
============
#. Verify that you have an appropriate version of the Linux kernel.
See `OS Recommendations`_ for details. ::
lsb_release -a
uname -r
#. On the admin node, use ``ceph-deploy`` to install Ceph on your
``ceph-client`` node. ::
ceph-deploy install ceph-client
#. On the admin node, use ``ceph-deploy`` to copy the Ceph configuration file
and the ``ceph.client.admin.keyring`` to the ``ceph-client``. ::
ceph-deploy admin ceph-client
Configure a Block Device
========================
#. On the ``ceph-client`` node, create a block device image. ::
rbd create foo --size 4096 [-m {mon-IP}] [-k /path/to/ceph.client.admin.keyring]
#. On the ``ceph-client`` node, map the image to a block device. ::
sudo rbd map foo --pool rbd --name client.admin [-m {mon-IP}] [-k /path/to/ceph.client.admin.keyring]
#. Use the block device by creating a file system on the ``ceph-client``
node. ::
sudo mkfs.ext4 -m0 /dev/rbd/rbd/foo
This may take a few moments.
#. Mount the file system on the ``ceph-client`` node. ::
sudo mkdir /mnt/ceph-block-device
sudo mount /dev/rbd/rbd/foo /mnt/ceph-block-device
cd /mnt/ceph-block-device
See `block devices`_ for additional details.
.. _Storage Cluster Quick Start: ../quick-ceph-deploy
.. _block devices: ../../rbd/rbd
.. _FAQ: http://wiki.ceph.com/03FAQs/01General_FAQ#How_Can_I_Give_Ceph_a_Try.3F
.. _OS Recommendations: ../os-recommendations