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diff --git a/doc/rbd/rbd-cloudstack.rst b/doc/rbd/rbd-cloudstack.rst new file mode 100644 index 000000000..1b961234b --- /dev/null +++ b/doc/rbd/rbd-cloudstack.rst @@ -0,0 +1,157 @@ +============================= + 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 be 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 a Ceph block device as Primary Storage, the steps include: + +#. Log in to the CloudStack UI. +#. Click **Infrastructure** on the left side navigation bar. +#. Select **View All** under **Primary Storage**. +#. Click the **Add Primary Storage** button on the top right hand side. +#. Fill in the following information, according to your infrastructure setup: + + - Scope (i.e. Cluster or Zone-Wide). + + - Zone. + + - Pod. + + - Cluster. + + - Name of Primary Storage. + + - For **Protocol**, select ``RBD``. + + - For **Provider**, select the appropriate provider type (i.e. DefaultPrimary, SolidFire, SolidFireShared, or CloudByte). Depending on the provider chosen, fill out the information pertinent to your setup. + +#. Add cluster information (``cephx`` is supported). + + - For **RADOS Monitor**, provide the IP address of a Ceph monitor node. + + - For **RADOS Pool**, provide the name of an RBD pool. + + - For **RADOS User**, provide a user that has sufficient rights to the RBD pool. Note: Do not include the ``client.`` part of the user. + + - For **RADOS Secret**, provide the secret the user's secret. + + - **Storage Tags** are optional. Use tags at your own discretion. For more information about storage tags in CloudStack, refer to `Storage Tags`_. + +#. Click **OK**. + +Create a Disk Offering +====================== + +To create a new disk offering, refer to `Create a New Disk Offering`_. +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://docs.cloudstack.apache.org/en/latest/installguide/hypervisor/kvm.html +.. _Storage Tags: http://docs.cloudstack.apache.org/en/latest/adminguide/storage.html#storage-tags +.. _Create a New Disk Offering: http://docs.cloudstack.apache.org/en/latest/adminguide/service_offerings.html#creating-a-new-disk-offering +.. _User Management: ../../rados/operations/user-management |