|
==========================
|
|
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 | | ceph - client |
|
|
| +-------->+ |
|
|
| ceph - deploy | | 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
|
|
|
|
The ``ceph-deploy`` utility copies the keyring to the ``/etc/ceph``
|
|
directory. Ensure that the keyring file has appropriate read permissions
|
|
(e.g., ``sudo chmod +r /etc/ceph/ceph.client.admin.keyring``).
|
|
|
|
Create a Block Device Pool
|
|
==========================
|
|
|
|
#. On the admin node, use the ``ceph`` tool to `create a pool`_
|
|
(we recommend the name 'rbd').
|
|
|
|
#. On the admin node, use the ``rbd`` tool to initialize the pool for use by RBD::
|
|
|
|
rbd pool init <pool-name>
|
|
|
|
Configure a Block Device
|
|
========================
|
|
|
|
#. On the ``ceph-client`` node, create a block device image. ::
|
|
|
|
rbd create foo --size 4096 --image-feature layering [-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 --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
|
|
|
|
#. Optionally configure the block device to be automatically mapped and mounted
|
|
at boot (and unmounted/unmapped at shutdown) - see the `rbdmap manpage`_.
|
|
|
|
|
|
See `block devices`_ for additional details.
|
|
|
|
.. _Storage Cluster Quick Start: ../quick-ceph-deploy
|
|
.. _create a pool: ../../rados/operations/pools/#create-a-pool
|
|
.. _block devices: ../../rbd
|
|
.. _FAQ: http://wiki.ceph.com/How_Can_I_Give_Ceph_a_Try
|
|
.. _OS Recommendations: ../os-recommendations
|
|
.. _rbdmap manpage: ../../man/8/rbdmap
|