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90 lines
3.5 KiB
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90 lines
3.5 KiB
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===================
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RBD and OpenStack
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===================
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You may use Ceph block device images with OpenStack with QEMU and ``libvirt`` as
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the interface. Ceph stripes block device images as objects across the cluster,
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which means that large Ceph block device images have better performance than a
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standalone server!
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To use RBD with OpenStack, you must install QEMU, ``libvirt``, and OpenStack
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first. We recommend using a separate physical host for your OpenStack
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installation. OpenStack recommends a minimum of 8GB of RAM and a quad-core
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processor. The following diagram depicts the OpenStack/Ceph technology stack.
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.. ditaa:: +---------------------------------------------------+
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| OpenStack |
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+---------------------------------------------------+
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| libvirt |
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+---------------------------------------------------+
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| QEMU/RBD |
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+---------------------------------------------------+
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| librbd |
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+---------------------------------------------------+
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| librados (C, C++, Java, Python, PHP, etc.) |
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+---------------+-+---------------+-+---------------+
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| OSDs | | MDSs | | Monitors |
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+---------------+ +---------------+ +---------------+
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.. _Installing OpenStack: ../../install/openstack
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.. important:: To use RBD with OpenStack, you must have a running Ceph cluster.
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Create a Pool
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=============
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By default, RBD uses the ``data`` pool. You may use any available RBD pool.
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We recommend creating a pool for Nova. Ensure your Ceph cluster is running,
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then create a pool. ::
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ceph osd pool create nova
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See `Create a Pool`_ for detail on specifying the number of placement groups
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for your pool, and `Placement Groups`_ for details on the number of placement
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groups you should set for your pool.
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.. _Create a Pool: ../../cluster-ops/pools#createpool
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.. _Placement Groups: ../../cluster-ops/placement-groups
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Install Ceph Common on the OpenStack Host
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=========================================
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OpenStack operates as a Ceph client. You must install Ceph common on the
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OpenStack host, and copy your Ceph cluster's ``ceph.conf`` file to the
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``/etc/ceph`` directory. If you have installed Ceph on the host, Ceph common
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is already included. ::
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sudo apt-get install ceph-common
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cd /etc/ceph
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ssh your-openstack-server sudo tee /etc/ceph/ceph.conf <ceph.conf
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Add the RBD Driver and the Pool Name to ``nova.conf``
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=====================================================
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OpenStack requires a driver to interact with RADOS block devices. You must also
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specify the pool name for the block device. On your OpenStack host, navigate to
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the ``/etc/conf`` directory. Open the ``nova.conf`` file in a text editor using
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sudo privileges and add the following lines to the file::
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volume_driver=nova.volume.driver.RBDDriver
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rbd_pool=nova
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Restart OpenStack
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=================
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To activate the RBD driver and load the RBD pool name into the configuration,
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you must restart OpenStack. Navigate the directory where you installed
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OpenStack, and execute the following::
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./rejoin-stack.sh
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If you have OpenStack configured as a service, you can also execute::
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sudo service nova-volume restart
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Once OpenStack is up and running, you should be able to create a volume with
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OpenStack on a Ceph RADOS block device. |