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doc: first cut of OpenStack/RBD w/out cephx. Authentication coming soon.

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Signed-off-by: John Wilkins <john.wilkins@inktank.com>
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John Wilkins 2012-06-18 14:29:04 -07:00
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===================
RBD and OpenStack
===================
You may utilize RBD with OpenStack. To use RBD with OpenStack, you must install
QEMU, ``libvirt``, and OpenStack first. We recommend using a separate physical
host for your OpenStack installation. OpenStack recommends a minimum of
8GB of RAM and a quad-core processor. If you have not already installed
OpenStack, install it now. See `Installing OpenStack`_ for details.
.. _Installing OpenStack: ../../install/openstack
.. tip: To get started quickly, turn off cephx authentication.
Create a Pool
-------------
By default, RBD uses the ``data`` pool. You may use any available RBD pool.
We recommend creating a pool for Nova. Ensure your Ceph cluster is running,
then create a pool. ::
sudo rados mkpool nova
Install Ceph Common on the OpenStack Host
-----------------------------------------
OpenStack operates as a Ceph client. You must install Ceph common on the
OpenStack host, and copy your Ceph cluster's ``ceph.conf`` file to the
``/etc/ceph`` directory. If you have installed Ceph on the host, Ceph common
is already included. ::
sudo apt-get install ceph-common
cd /etc/ceph
ssh your-openstack-server sudo tee /etc/ceph/ceph.conf <ceph.conf
Add the RBD Driver and the Pool Name to ``nova.conf``
-----------------------------------------------------
OpenStack requires a driver to interact with RADOS block devices. You must also
specify the pool name for the block device. On your OpenStack host, navigate to
the ``/etc/conf`` directory. Open the ``nova.conf`` file in a text editor using
sudo privileges and add the following lines to the file::
volume_driver=nova.volume.driver.RBDDriver
rbd_pool=nova
Restart OpenStack
-----------------
To activate the RBD driver and load the RBD pool name into the configuration,
you must restart OpenStack. Navigate the directory where you installed
OpenStack, and execute the following::
./rejoin-stack.sh
If you have OpenStack configured as a service, you can also execute::
sudo service nova-volume restart
Once OpenStack is up and running, you should be able to create a volume with
OpenStack on a Ceph RADOS block device.

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Kernel Objects <rbd-ko> Kernel Objects <rbd-ko>
QEMU and RBD <qemu-rbd> QEMU and RBD <qemu-rbd>
libvirt <libvirt> libvirt <libvirt>
RBD and OpenStack <rbd-openstack>