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158 lines
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158 lines
6.5 KiB
ReStructuredText
=============================
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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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+---------------------------------------------------+
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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
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access to a running Ceph Storage 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 14.04 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 Storage Cluster. Install
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QEMU and configure it for use with Ceph; then, install ``libvirt`` version
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0.9.13 or higher (you may need to compile from source) and ensure it is running
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with Ceph.
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.. note:: Ubuntu 14.04 and CentOS 7.2 will have ``libvirt`` with RBD storage
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pool support enabled by default.
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.. index:: pools; CloudStack
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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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A newly created pool must be initialized prior to use. Use the ``rbd`` tool
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to initialize the pool::
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rbd pool init cloudstack
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Create a Ceph User
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==================
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To access the Ceph cluster we require a Ceph user which has the correct
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credentials to access the ``cloudstack`` pool we just created. Although we could
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use ``client.admin`` for this, it's recommended to create a user with only
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access to the ``cloudstack`` pool. ::
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ceph auth get-or-create client.cloudstack mon 'profile rbd' osd 'profile rbd pool=cloudstack'
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Use the information returned by the command in the next step when adding the
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Primary Storage.
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See `User Management`_ for additional details.
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Add Primary Storage
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===================
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To add a Ceph block device as Primary Storage, the steps 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 **View All** under **Primary Storage**.
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#. Click the **Add Primary Storage** button on the top right hand side.
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#. Fill in the following information, according to your infrastructure setup:
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- Scope (i.e. Cluster or Zone-Wide).
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- Zone.
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- Pod.
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- Cluster.
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- Name of Primary Storage.
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- For **Protocol**, select ``RBD``.
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- 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.
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#. Add cluster information (``cephx`` is supported).
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- For **RADOS Monitor**, provide the IP addresses or DNS names of Ceph monitors. Please note that support for comma-separated list of IP addresses or DNS names is only present in Cloudstack v4.18.0.0 or later.
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- For **RADOS Pool**, provide the name of an RBD pool.
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- For **RADOS User**, provide a user that has sufficient rights to the RBD pool. Note: Do not include the ``client.`` part of the user.
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- For **RADOS Secret**, provide the secret the user's secret.
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- **Storage Tags** are optional. Use tags at your own discretion. For more information about storage tags in CloudStack, refer to `Storage Tags`_.
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#. Click **OK**.
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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`_.
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Create a disk offering so that it matches the ``rbd`` tag.
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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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- Until v4.17.1.0, CloudStack will only bind to one monitor at a time. You can however use multiple DNS A or AAAA records in a round-robin fashion to spread connections over multiple monitors.
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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://docs.cloudstack.apache.org/en/latest/installguide/hypervisor/kvm.html
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.. _Storage Tags: http://docs.cloudstack.apache.org/en/latest/adminguide/storage.html#storage-tags
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.. _Create a New Disk Offering: http://docs.cloudstack.apache.org/en/latest/adminguide/service_offerings.html#creating-a-new-disk-offering
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.. _User Management: ../../rados/operations/user-management
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