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123 lines
5.7 KiB
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123 lines
5.7 KiB
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=============================
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Block Devices and CloudStack
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=============================
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You may use Ceph block device images with CloudStack 4.0 and higher through
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``libvirt``, which configures the QEMU interface to ``librbd``. Ceph stripes
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block device images as objects across the cluster, which means that large Ceph
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block device images have better performance than a standalone server!
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To use Ceph block devices with CloudStack 4.0 and higher, you must install QEMU,
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``libvirt``, and CloudStack first. We recommend using a separate physical host
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for your CloudStack installation. CloudStack recommends a minimum of 4GB of RAM
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and a dual-core processor, but more CPU and RAM will perform better. The
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following diagram depicts the CloudStack/Ceph technology stack.
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.. ditaa:: +---------------------------------------------------+
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| CloudStack |
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+---------------------------------------------------+
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| libvirt |
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+------------------------+--------------------------+
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| configures
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v
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+---------------------------------------------------+
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| QEMU |
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+---------------------------------------------------+
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| librbd |
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+---------------------------------------------------+
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| librados |
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+------------------------+-+------------------------+
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| OSDs | | Monitors |
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+------------------------+ +------------------------+
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.. important:: To use Ceph block devices with CloudStack, you must have a
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running Ceph cluster.
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CloudStack integrates with Ceph's block devices to provide CloudStack with a
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back end for CloudStack's Primary Storage. The instructions below detail the
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setup for CloudStack Primary Storage.
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.. note:: We recommend installing with Ubuntu 13.04 or later so that
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you can use package installation instead of having to compile
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libvirt from source.
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Installing and configuring QEMU for use with CloudStack doesn't require any
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special handling. Ensure that you have a running Ceph cluster. Install QEMU and
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configure it for use with Ceph; then, install ``libvirt`` version 0.9.13 or
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higher (you may need to compile from source) and ensure it is running with Ceph.
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#. `Install and Configure QEMU`_.
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#. `Install and Configure libvirt`_ version 0.9.13 or higher.
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#. Also see `KVM Hypervisor Host Installation`_.
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.. note:: Raring Ringtail (13.04) will have ``libvirt`` version 0.9.13 or higher
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with RBD storage pool support enabled by default.
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Create a Pool
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=============
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By default, Ceph block devices use the ``rbd`` pool. Create a pool for
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CloudStack NFS Primary Storage. Ensure your Ceph cluster is running, then create
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the pool. ::
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ceph osd pool create cloudstack
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See `Create a Pool`_ for details on specifying the number of placement groups
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for your pools, and `Placement Groups`_ for details on the number of placement
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groups you should set for your pools.
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Add Primary Storage
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===================
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To add primary storage, refer to `Add Primary Storage (4.0.0)`_ or
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`Add Primary Storage (4.0.1)`_. To add a Ceph block device, the steps
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include:
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#. Log in to the CloudStack UI.
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#. Click **Infrastructure** on the left side navigation bar.
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#. Select the Zone you want to use for Primary Storage.
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#. Click the **Compute** tab.
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#. Select **View All** on the `Primary Storage` node in the diagram.
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#. Click **Add Primary Storage**.
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#. Follow the CloudStack instructions.
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- For **Protocol**, select ``RBD``.
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- Add cluster information (cephx is supported).
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- Add ``rbd`` as a tag.
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Create a Disk Offering
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======================
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To create a new disk offering, refer to `Create a New Disk Offering (4.0.0)`_ or
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`Create a New Disk Offering (4.0.1)`_. Create a disk offering so that it
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matches the ``rbd`` tag. The ``StoragePoolAllocator`` will choose the ``rbd``
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pool when searching for a suitable storage pool. If the disk offering doesn't
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match the ``rbd`` tag, the ``StoragePoolAllocator`` may select the pool you
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created (e.g., ``cloudstack``).
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Limitations
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===========
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- CloudStack will only bind to one monitor (You can however create a Round Robin DNS record over multiple monitors)
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- CloudStack does not support cloning snapshots.
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- You still need a (small) NFS based Primary Storage for the SystemVMs
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- You may need to compile ``libvirt`` to use version 0.9.13 with Ubuntu.
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.. _Create a Pool: ../../rados/operations/pools#createpool
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.. _Placement Groups: ../../rados/operations/placement-groups
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.. _Install and Configure QEMU: ../qemu-rbd
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.. _Install and Configure libvirt: ../libvirt
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.. _KVM Hypervisor Host Installation: http://cloudstack.apache.org/docs/en-US/Apache_CloudStack/4.0.0-incubating/html/Installation_Guide/hypervisor-kvm-install-flow.html
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.. _Add Primary Storage (4.0.0): http://cloudstack.apache.org/docs/en-US/Apache_CloudStack/4.0.0-incubating/html/Admin_Guide/primary-storage-add.html
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.. _Add Primary Storage (4.0.1): http://cloudstack.apache.org/docs/en-US/Apache_CloudStack/4.0.1-incubating/html/Admin_Guide/primary-storage-add.html
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.. _Create a New Disk Offering (4.0.0): http://cloudstack.apache.org/docs/en-US/Apache_CloudStack/4.0.0-incubating/html/Admin_Guide/compute-disk-service-offerings.html#creating-disk-offerings
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.. _Create a New Disk Offering (4.0.1): http://cloudstack.apache.org/docs/en-US/Apache_CloudStack/4.0.1-incubating/html/Admin_Guide/compute-disk-service-offerings.html#creating-disk-offerings
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