Merge "docs: improve external Ceph docs"
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@ -25,40 +25,22 @@ Requirements
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Refer to https://docs.ceph.com/en/latest/rbd/rbd-openstack/ for details on
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creating the pool and keyrings with appropriate permissions for each service.
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Enabling External Ceph
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~~~~~~~~~~~~~~~~~~~~~~
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To activate external Ceph integration you need to enable Ceph backend.
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This can be done individually per service in ``/etc/kolla/globals.yml``:
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.. code-block:: yaml
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glance_backend_ceph: "yes"
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cinder_backend_ceph: "yes"
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nova_backend_ceph: "yes"
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gnocchi_backend_storage: "ceph"
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enable_manila_backend_cephfs_native: "yes"
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Edit the Inventory File
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~~~~~~~~~~~~~~~~~~~~~~~
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When using external Ceph, there may be no nodes defined in the storage group.
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This will cause Cinder and related services relying on this group to fail.
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In this case, operator should add some nodes to the storage group, all the
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nodes where ``cinder-volume`` and ``cinder-backup`` will run:
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.. code-block:: ini
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[storage]
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compute01
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Configuring External Ceph
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~~~~~~~~~~~~~~~~~~~~~~~~~
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Ceph integration is configured for different OpenStack services independently.
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Glance
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------
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Configuring Glance for Ceph includes the following steps:
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Ceph RBD can be used as a storage backend for Glance images. Configuring Glance
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for Ceph includes the following steps:
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#. Enable Glance Ceph backend in ``globals.yml``:
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.. code-block:: yaml
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glance_backend_ceph: "yes"
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#. Configure Ceph authentication details in ``/etc/kolla/globals.yml``:
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@ -84,7 +66,24 @@ Configuring Glance for Ceph includes the following steps:
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Cinder
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------
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Configuring Cinder for Ceph includes following steps:
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Ceph RBD can be used as a storage backend for Cinder volumes. Configuring
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Cinder for Ceph includes following steps:
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#. When using external Ceph, there may be no nodes defined in the storage
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group. This will cause Cinder and related services relying on this group to
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fail. In this case, operator should add some nodes to the storage group,
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all the nodes where ``cinder-volume`` and ``cinder-backup`` will run:
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.. code-block:: ini
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[storage]
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control01
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#. Enable Cinder Ceph backend in ``globals.yml``:
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.. code-block:: yaml
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cinder_backend_ceph: "yes"
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#. Configure Ceph authentication details in ``/etc/kolla/globals.yml``:
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@ -115,22 +114,42 @@ Configuring Cinder for Ceph includes following steps:
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``cinder-backup`` requires two keyrings for accessing volumes
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and backup pool.
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Nova
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----
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Configuring Nova for Ceph includes following steps:
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Nova must also be configured to allow access to Cinder volumes:
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#. Configure Ceph authentication details in ``/etc/kolla/globals.yml``:
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* ``ceph_cinder_keyring`` (default: ``ceph.client.cinder.keyring``)
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* ``ceph_nova_keyring`` (by default it's the same as ceph_cinder_keyring)
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#. Copy Ceph keyring file(s) to:
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* ``/etc/kolla/config/nova/<ceph_cinder_keyring>``
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Nova
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----
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Ceph RBD can be used as a storage backend for Nova instance ephemeral disks.
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This avoids the requirement for local storage for instances on compute nodes.
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It improves the performance of migration, since instances' ephemeral disks do
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not need to be copied between hypervisors.
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Configuring Nova for Ceph includes following steps:
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#. Enable Nova Ceph backend in ``globals.yml``:
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.. code-block:: yaml
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nova_backend_ceph: "yes"
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#. Configure Ceph authentication details in ``/etc/kolla/globals.yml``:
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* ``ceph_nova_keyring`` (by default it's the same as
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``ceph_cinder_keyring``)
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* ``ceph_nova_user`` (default: ``nova``)
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* ``ceph_nova_pool_name`` (default: ``vms``)
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#. Copy Ceph configuration file to ``/etc/kolla/config/nova/ceph.conf``
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#. Copy Ceph keyring file(s) to:
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* ``/etc/kolla/config/nova/<ceph_cinder_keyring>``
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* ``/etc/kolla/config/nova/<ceph_nova_keyring>`` (if your Ceph deployment
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created one)
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@ -143,8 +162,15 @@ Configuring Nova for Ceph includes following steps:
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Gnocchi
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-------
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Ceph object storage can be used as a storage backend for Gnocchi metrics.
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Configuring Gnocchi for Ceph includes following steps:
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#. Enable Gnocchi Ceph backend in ``globals.yml``:
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.. code-block:: yaml
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gnocchi_backend_storage: "ceph"
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#. Configure Ceph authentication details in ``/etc/kolla/globals.yml``:
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* ``ceph_gnocchi_keyring``
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@ -158,10 +184,15 @@ Configuring Gnocchi for Ceph includes following steps:
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Manila
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------
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Configuring Manila for Ceph includes following steps:
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CephFS can be used as a storage backend for Manila shares. Configuring Manila
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for Ceph includes following steps:
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#. Enable Manila Ceph backend in ``globals.yml``:
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.. code-block:: yaml
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enable_manila_backend_cephfs_native: "yes"
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#. Configure CephFS backend by setting ``enable_manila_backend_cephfs_native``
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to ``true``
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#. Configure Ceph authentication details in ``/etc/kolla/globals.yml``:
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* ``ceph_manila_keyring`` (default: ``ceph.client.manila.keyring``)
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