diff options
Diffstat (limited to 'src/ceph/doc/rbd/rbd-cloudstack.rst')
| -rw-r--r-- | src/ceph/doc/rbd/rbd-cloudstack.rst | 135 |
1 files changed, 135 insertions, 0 deletions
diff --git a/src/ceph/doc/rbd/rbd-cloudstack.rst b/src/ceph/doc/rbd/rbd-cloudstack.rst new file mode 100644 index 0000000..f66d6d4 --- /dev/null +++ b/src/ceph/doc/rbd/rbd-cloudstack.rst @@ -0,0 +1,135 @@ +============================= + Block Devices and CloudStack +============================= + +You may use Ceph Block Device images with CloudStack 4.0 and higher through +``libvirt``, which configures the QEMU interface to ``librbd``. Ceph stripes +block device images as objects across the cluster, which means that large Ceph +Block Device images have better performance than a standalone server! + +To use Ceph Block Devices with CloudStack 4.0 and higher, you must install QEMU, +``libvirt``, and CloudStack first. We recommend using a separate physical host +for your CloudStack installation. CloudStack recommends a minimum of 4GB of RAM +and a dual-core processor, but more CPU and RAM will perform better. The +following diagram depicts the CloudStack/Ceph technology stack. + + +.. ditaa:: +---------------------------------------------------+ + | CloudStack | + +---------------------------------------------------+ + | libvirt | + +------------------------+--------------------------+ + | + | configures + v + +---------------------------------------------------+ + | QEMU | + +---------------------------------------------------+ + | librbd | + +---------------------------------------------------+ + | librados | + +------------------------+-+------------------------+ + | OSDs | | Monitors | + +------------------------+ +------------------------+ + +.. important:: To use Ceph Block Devices with CloudStack, you must have + access to a running Ceph Storage Cluster. + +CloudStack integrates with Ceph's block devices to provide CloudStack with a +back end for CloudStack's Primary Storage. The instructions below detail the +setup for CloudStack Primary Storage. + +.. note:: We recommend installing with Ubuntu 14.04 or later so that + you can use package installation instead of having to compile + libvirt from source. + +Installing and configuring QEMU for use with CloudStack doesn't require any +special handling. Ensure that you have a running Ceph Storage Cluster. Install +QEMU and configure it for use with Ceph; then, install ``libvirt`` version +0.9.13 or higher (you may need to compile from source) and ensure it is running +with Ceph. + + +.. note:: Ubuntu 14.04 and CentOS 7.2 will have ``libvirt`` with RBD storage + pool support enabled by default. + +.. index:: pools; CloudStack + +Create a Pool +============= + +By default, Ceph block devices use the ``rbd`` pool. Create a pool for +CloudStack NFS Primary Storage. Ensure your Ceph cluster is running, then create +the pool. :: + + ceph osd pool create cloudstack + +See `Create a Pool`_ for details on specifying the number of placement groups +for your pools, and `Placement Groups`_ for details on the number of placement +groups you should set for your pools. + +A newly created pool must initialized prior to use. Use the ``rbd`` tool +to initialize the pool:: + + rbd pool init cloudstack + +Create a Ceph User +================== + +To access the Ceph cluster we require a Ceph user which has the correct +credentials to access the ``cloudstack`` pool we just created. Although we could +use ``client.admin`` for this, it's recommended to create a user with only +access to the ``cloudstack`` pool. :: + + ceph auth get-or-create client.cloudstack mon 'profile rbd' osd 'profile rbd pool=cloudstack' + +Use the information returned by the command in the next step when adding the +Primary Storage. + +See `User Management`_ for additional details. + +Add Primary Storage +=================== + +To add primary storage, refer to `Add Primary Storage (4.2.0)`_ to add a Ceph block device, the steps +include: + +#. Log in to the CloudStack UI. +#. Click **Infrastructure** on the left side navigation bar. +#. Select the Zone you want to use for Primary Storage. +#. Click the **Compute** tab. +#. Select **View All** on the `Primary Storage` node in the diagram. +#. Click **Add Primary Storage**. +#. Follow the CloudStack instructions. + + - For **Protocol**, select ``RBD``. + - Add cluster information (cephx is supported). Note: Do not include the ``client.`` part of the user. + - Add ``rbd`` as a tag. + + +Create a Disk Offering +====================== + +To create a new disk offering, refer to `Create a New Disk Offering (4.2.0)`_. +Create a disk offering so that it matches the ``rbd`` tag. +The ``StoragePoolAllocator`` will choose the ``rbd`` +pool when searching for a suitable storage pool. If the disk offering doesn't +match the ``rbd`` tag, the ``StoragePoolAllocator`` may select the pool you +created (e.g., ``cloudstack``). + + +Limitations +=========== + +- CloudStack will only bind to one monitor (You can however create a Round Robin DNS record over multiple monitors) + + + +.. _Create a Pool: ../../rados/operations/pools#createpool +.. _Placement Groups: ../../rados/operations/placement-groups +.. _Install and Configure QEMU: ../qemu-rbd +.. _Install and Configure libvirt: ../libvirt +.. _KVM Hypervisor Host Installation: http://cloudstack.apache.org/docs/en-US/Apache_CloudStack/4.2.0/html/Installation_Guide/hypervisor-kvm-install-flow.html +.. _Add Primary Storage (4.2.0): http://cloudstack.apache.org/docs/en-US/Apache_CloudStack/4.2.0/html/Admin_Guide/primary-storage-add.html +.. _Create a New Disk Offering (4.2.0): http://cloudstack.apache.org/docs/en-US/Apache_CloudStack/4.2.0/html/Admin_Guide/compute-disk-service-offerings.html#creating-disk-offerings +.. _User Management: ../../rados/operations/user-management |