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Merge "Add Ceph support statement"

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Zuul 2020-07-07 17:17:16 +00:00 committed by Gerrit Code Review
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doc/source/admin/cephfs_driver.rst
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@ -26,12 +26,10 @@ filesystem.
When guests access CephFS using the native Ceph protocol, access is
controlled via Ceph's cephx authentication system. If a user requests
share access for an ID, Ceph creates a corresponding Ceph auth ID and a secret
key, if they do not already exist, and authorizes the ID to access the share.
key if they do not already exist, and authorizes the ID to access the share.
The client can then mount the share using the ID and the secret key. To learn
more about configuring Ceph clients to access the shares created using this
driver, please see the Ceph documentation (http://docs.ceph.com/docs/master/cephfs/).
If you choose to use the kernel client rather than the FUSE client, the share
size limits set in manila may not be obeyed.
driver, please see the `Ceph documentation`_
And when guests access CephFS through NFS, an NFS-Ganesha server mediates
access to CephFS. The driver enables access control by managing the NFS-Ganesha
@ -44,34 +42,16 @@ Supported Operations
The following operations are supported with CephFS backend:
- Create/delete share
- Allow/deny CephFS native protocol access to share
- Allow/deny access to share
* Only ``cephx`` access type is supported for CephFS native protocol.
* ``read-only`` access level is supported in Newton or later versions
of manila.
* ``read-write`` access level is supported in Mitaka or later versions
of manila.
(or)
Allow/deny NFS access to share
* Only ``ip`` access type is supported for NFS protocol.
* ``read-only`` and ``read-write`` access levels are supported in Pike or
later versions of manila.
* ``read-only`` and ``read-write`` access levels are supported.
- Extend/shrink share
- Create/delete snapshot
- Create/delete consistency group (CG)
- Create/delete CG snapshot
.. warning::
CephFS currently supports snapshots as an experimental feature, therefore
the snapshot support with the CephFS Native driver is also experimental
and should not be used in production environments. For more information,
see
(http://docs.ceph.com/docs/master/cephfs/experimental-features/#snapshots).
- Create/delete share groups
- Create/delete share group snapshots
Prerequisites
@ -80,38 +60,68 @@ Prerequisites
.. important:: A manila share backed by CephFS is only as good as the
underlying filesystem. Take care when configuring your Ceph
cluster, and consult the latest guidance on the use of
CephFS in the Ceph documentation (
http://docs.ceph.com/docs/master/cephfs/)
CephFS in the `Ceph documentation`_.
Ceph testing matrix
-------------------
As Ceph and Manila continue to grow, it is essential to test and support
combinations of releases supported by both projects. However, there is
little community bandwidth to cover all of them. Below is the current state of
testing for Ceph releases with this project. Adjacent components such as
`devstack-plugin-ceph <https://opendev.org/openstack/devstack-plugin-ceph>`_
and `tripleo <https://opendev.org/openstack/tripleo-heat-templates>`_ are
added to the table below. Contributors to those projects can determine what
versions of ceph are tested and supported with manila by those components;
however, their state is presented here for ease of access.
.. important::
From the Victoria cycle, the Manila CephFS driver is not tested or
supported with Ceph clusters older than Nautilus. Future releases of
Manila may be incompatible with Nautilus too! We suggest always running
the latest version of Manila with the latest release of Ceph.
+-------------------+----------+----------------------+-----------+
| OpenStack release | manila | devstack-plugin-ceph | tripleo |
+===================+==========+======================+===========+
| Queens | Luminous | Luminous | Luminous |
+-------------------+----------+----------------------+-----------+
| Rocky | Luminous | Luminous | Luminous |
+-------------------+----------+----------------------+-----------+
| Stein | Nautilus | Luminous, Nautilus | Nautilus |
+-------------------+----------+----------------------+-----------+
| Train | Nautilus | Luminous, Nautilus | Nautilus |
+-------------------+----------+----------------------+-----------+
| Ussuri | Nautilus | Luminous, Nautilus | Nautilus |
+-------------------+----------+----------------------+-----------+
| Victoria | Nautilus | Nautilus | Nautilus |
+-------------------+----------+----------------------+-----------+
Common Prerequisites
--------------------
- A Ceph cluster with a filesystem configured (See `Create ceph filesystem`_ on
how to create a filesystem.)
- ``ceph-common`` package installed in the servers running the
:term:`manila-share` service.
- Network connectivity between your Ceph cluster's public network and the
servers running the :term:`manila-share` service.
For CephFS native shares
------------------------
- Mitaka or later versions of manila.
- Jewel or later versions of Ceph.
- A Ceph cluster with a filesystem configured (
http://docs.ceph.com/docs/master/cephfs/createfs/)
- ``ceph-common`` package installed in the servers running the
:term:`manila-share` service.
- Ceph client installed in the guest, preferably the FUSE based client,
``ceph-fuse``.
- Network connectivity between your Ceph cluster's public network and the
servers running the :term:`manila-share` service.
- Ceph client installed in the guest
- Network connectivity between your Ceph cluster's public network and guests.
See :ref:`security_cephfs_native`.
For CephFS NFS shares
---------------------
- Pike or later versions of manila.
- Kraken or later versions of Ceph.
- 2.5 or later versions of NFS-Ganesha.
- A Ceph cluster with a filesystem configured (
http://docs.ceph.com/docs/master/cephfs/createfs/)
- ``ceph-common`` package installed in the servers running the
:term:`manila-share` service.
- NFS client installed in the guest.
- Network connectivity between your Ceph cluster's public network and the
servers running the :term:`manila-share` service.
- Network connectivity between your Ceph cluster's public network and
NFS-Ganesha server.
- Network connectivity between your NFS-Ganesha server and the manila
@ -173,19 +183,17 @@ log files respectively.
Enabling snapshot support in Ceph backend
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Enable snapshots in Ceph if you want to use them in manila:
CephFS Snapshots were experimental prior to the Nautilus release of Ceph.
There may be some `limitations on snapshots`_ based on the Ceph version you
use.
From Ceph Nautilus, all new filesystems created on Ceph have snapshots
enabled by default. If you've upgraded your ceph cluster and want to enable
snapshots on a pre-existing filesystem, you can do so:
.. code-block:: console
ceph mds set allow_new_snaps true --yes-i-really-mean-it
.. warning::
Note that the snapshot support for the CephFS driver is experimental and is
known to have several caveats for use. Only enable this and the
equivalent ``manila.conf`` option if you understand these risks. See
(http://docs.ceph.com/docs/master/cephfs/experimental-features/#snapshots)
for more details.
ceph fs set {fs_name} allow_new_snaps true
Configuring CephFS backend in manila.conf
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@ -195,7 +203,7 @@ Configure CephFS native share backend in manila.conf
Add CephFS to ``enabled_share_protocols`` (enforced at manila api layer). In
this example we leave NFS and CIFS enabled, although you can remove these
if you will only use CephFS:
if you will only use a CephFS backend:
.. code-block:: ini
@ -213,25 +221,18 @@ Create a section like this to define a CephFS native backend:
cephfs_protocol_helper_type = CEPHFS
cephfs_auth_id = manila
cephfs_cluster_name = ceph
cephfs_enable_snapshots = False
cephfs_enable_snapshots = True
Set ``driver-handles-share-servers`` to ``False`` as the driver does not
manage the lifecycle of ``share-servers``. To let the driver perform snapshot
related operations, set ``cephfs_enable_snapshots`` to True. For the driver
backend to expose shares via the native Ceph protocol, set
``cephfs_protocol_helper_type`` to ``CEPHFS``.
manage the lifecycle of ``share-servers``. For the driver backend to expose
shares via the native Ceph protocol, set ``cephfs_protocol_helper_type`` to
``CEPHFS``.
Then edit ``enabled_share_backends`` to point to the driver's backend section
using the section name. In this example we are also including another backend
("generic1"), you would include whatever other backends you have configured.
.. note::
For Mitaka, Newton, and Ocata releases, the ``share_driver`` path
was ``manila.share.drivers.cephfs.cephfs_native.CephFSNativeDriver``
.. code-block:: ini
enabled_share_backends = generic1, cephfsnative1
@ -240,6 +241,13 @@ using the section name. In this example we are also including another backend
Configure CephFS NFS share backend in manila.conf
-------------------------------------------------
.. note::
Prior to configuring the Manila CephFS driver to use NFS, you must have
installed and configured NFS-Ganesha. For guidance on configuration,
refer to the `NFS-Ganesha setup guide
<../contributor/ganesha.html#nfs-ganesha-configuration>`_.
Add NFS to ``enabled_share_protocols`` if it's not already there:
.. code-block:: ini
@ -259,9 +267,11 @@ Create a section to define a CephFS NFS share backend:
cephfs_conf_path = /etc/ceph/ceph.conf
cephfs_auth_id = manila
cephfs_cluster_name = ceph
cephfs_enable_snapshots = False
cephfs_enable_snapshots = True
cephfs_ganesha_server_is_remote= False
cephfs_ganesha_server_ip = 172.24.4.3
ganesha_rados_store_enable = True
ganesha_rados_store_pool_name = cephfs_data
The following options are set in the driver backend section above:
@ -285,41 +295,18 @@ The following options are set in the driver backend section above:
recommended to set this option even if the ganesha server is co-located
with the :term:`manila-share` service.
* ``ganesha_rados_store_enable`` to True or False. Setting this option to
True allows NFS Ganesha to store exports and its export counter in Ceph
RADOS objects. We recommend setting this to True and using a RADOS object
since it is useful for highly available NFS-Ganesha deployments to store
their configuration efficiently in an already available distributed
storage system.
With NFS-Ganesha (v2.5.4 or later), Ceph (v12.2.2 or later), the driver (Queens
or later) can store NFS-Ganesha exports and export counter in Ceph RADOS
objects. This is useful for highly available NFS-Ganesha deployments to store
its configuration efficiently in an already available distributed storage
system. Set additional options in the NFS driver section to enable the driver
to do this.
.. code-block:: ini
[cephfsnfs1]
ganesha_rados_store_enable = True
ganesha_rados_store_pool_name = cephfs_data
driver_handles_share_servers = False
share_backend_name = CEPHFSNFS1
share_driver = manila.share.drivers.cephfs.driver.CephFSDriver
cephfs_protocol_helper_type = NFS
cephfs_conf_path = /etc/ceph/ceph.conf
cephfs_auth_id = manila
cephfs_cluster_name = ceph
cephfs_enable_snapshots = False
cephfs_ganesha_server_is_remote= False
cephfs_ganesha_server_ip = 172.24.4.3
The following ganesha library (See manila's ganesha library documentation for
more details) related options are set in the driver backend section above:
* ``ganesha_rados_store_enable`` to True for persisting Ganesha exports and
export counter in Ceph RADOS objects.
* ``ganesha_rados_store_pool_name`` to the Ceph RADOS pool that stores Ganesha
exports and export counter objects. If you want to use one of the backend
CephFS's RADOS pools, then using CephFS's data pool is preferred over using
its metadata pool.
* ``ganesha_rados_store_pool_name`` to the name of the RADOS pool you have
created for use with NFS-Ganesha. Set this option only if also setting
the ``ganesha_rados_store_enable`` option to True. If you want to use
one of the backend CephFS's RADOS pools, then using CephFS's data pool is
preferred over using its metadata pool.
Edit ``enabled_share_backends`` to point to the driver's backend section
using the section name, ``cephfsnfs1``.
@ -340,10 +327,10 @@ Configure a share type suitable for CephFS native share:
.. code-block:: console
manila type-create cephfsnativetype false
manila type-key cephfsnativetype set vendor_name=Ceph storage_protocol=CEPHFS
manila type-create cephfsnativetype false
manila type-key cephfsnativetype set vendor_name=Ceph storage_protocol=CEPHFS
Then create yourself a share:
Then create a share,
.. code-block:: console
@ -366,8 +353,8 @@ Configure a share type suitable for CephFS NFS share:
.. code-block:: console
manila type-create cephfsnfstype false
manila type-key cephfsnfstype set vendor_name=Ceph storage_protocol=NFS
manila type-create cephfsnfstype false
manila type-key cephfsnfstype set vendor_name=Ceph storage_protocol=NFS
Then create a share:
@ -404,30 +391,6 @@ Note the access status, and the access/secret key of ``alice``.
manila access-list cephnativeshare1
.. note::
In Mitaka release, the secret key is not exposed by any manila API. The
Ceph storage admin needs to pass the secret key to the guest out of band of
manila. You can refer to the link below to see how the storage admin
could obtain the secret key of an ID.
http://docs.ceph.com/docs/jewel/rados/operations/user-management/#get-a-user
Alternatively, the cloud admin can create Ceph auth IDs for each of the
tenants. The users can then request manila to authorize the pre-created
Ceph auth IDs, whose secret keys are already shared with them out of band
of manila, to access the shares.
Following is a command that the cloud admin could run from the
server running the :term:`manila-share` service to create a Ceph auth ID
and get its keyring file.
.. code-block:: console
ceph --name=client.manila --keyring=/etc/ceph/manila.keyring auth \
get-or-create client.alice -o alice.keyring
For more details, please see the Ceph documentation.
http://docs.ceph.com/docs/jewel/rados/operations/user-management/#add-a-user
Allow access to CephFS NFS share
--------------------------------
@ -475,6 +438,36 @@ from the share's export location:
--keyring=./alice.keyring \
--client-mountpoint=/volumes/_nogroup/4c55ad20-9c55-4a5e-9233-8ac64566b98c
Mounting CephFS native share using Kernel client
------------------------------------------------
If you have the ``ceph-common`` package installed in the client host, you can
use the kernel client to mount CephFS shares.
.. important::
If you choose to use the kernel client rather than the FUSE client the
share size limits set in manila may not be obeyed in versions of kernel
older than 4.17 and Ceph versions older than mimic. See the
`quota limitations documentation`_ to understand CephFS quotas.
The mount command is as follows:
.. code-block:: console
mount -t ceph {mon1 ip addr}:6789,{mon2 ip addr}:6789,{mon3 ip addr}:6789:/ \
{mount-point} -o name={access-id},secret={access-key}
With our earlier examples, this would be:
.. code-block:: console
mount -t ceph 192.168.1.7:6789, 192.168.1.8:6789, 192.168.1.9:6789:/ \
/volumes/_nogroup/4c55ad20-9c55-4a5e-9233-8ac64566b98c \
-o name=alice,secret='AQA8+ANW/4ZWNRAAOtWJMFPEihBA1unFImJczA=='
Mount CephFS NFS share using NFS client
---------------------------------------
@ -504,26 +497,12 @@ Known restrictions
share.
Restrictions with CephFS native share backend
---------------------------------------------
- To restrict share sizes, CephFS uses quotas that are enforced in the client
side. The CephFS FUSE clients are relied on to respect quotas.
Mitaka release only
- The secret-key of a Ceph auth ID required to mount a share is not exposed to
an user by a manila API. To workaround this, the storage admin would need to
pass the key out of band of manila, or the user would need to use the Ceph ID
and key already created and shared with her by the cloud admin.
Security
~~~~~~~~
- Each share's data is mapped to a distinct Ceph RADOS namespace. A guest is
restricted to access only that particular RADOS namespace.
http://docs.ceph.com/docs/master/cephfs/file-layouts/
https://docs.ceph.com/docs/nautilus/cephfs/file-layouts/
- An additional level of resource isolation can be provided by mapping a
share's contents to a separate RADOS pool. This layout would be preferred
@ -533,7 +512,7 @@ Security
.. code-block:: console
manila type-key cephfstype set cephfs:data_isolated=True
manila type-key cephfstype set cephfs:data_isolated=True
.. _security_cephfs_native:
@ -543,9 +522,13 @@ Security with CephFS native share backend
As the guests need direct access to Ceph's public network, CephFS native
share backend is suitable only in private clouds where guests can be trusted.
.. _Ceph documentation: https://docs.ceph.com/docs/nautilus/cephfs/
.. _Create ceph filesystem: https://docs.ceph.com/docs/nautilus/cephfs/createfs/
.. _limitations on snapshots: https://docs.ceph.com/docs/nautilus/cephfs/experimental-features/#snapshots
.. _quota limitations documentation: https://docs.ceph.com/docs/nautilus/cephfs/quota/#limitations
The :mod:`manila.share.drivers.cephfs.driver` Module
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.. automodule:: manila.share.drivers.cephfs.driver
:noindex:

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releasenotes/notes/cephfs-support-statement-for-victoria-and-beyond-e94baa7857b1624c.yaml Normal file
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@ -0,0 +1,10 @@
---
upgrade:
- |
This version of OpenStack Manila has not been tested with Ceph clusters
prior to Nautilus. The CephFS drivers interact with with Ceph clusters
via a python binding called "ceph_volume_client". This is being
replaced by supplying management operations via the ceph manager
interface that was introduced in the Nautilus release of Ceph. So it is
advised that you upgrade your Ceph deployment prior to upgrading to
Manila's Victoria release.