mirror of https://github.com/ceph/ceph-ansible.git
232 lines
7.3 KiB
ReStructuredText
232 lines
7.3 KiB
ReStructuredText
OSD Scenario
|
|
============
|
|
|
|
As of stable-4.0, the following scenarios are not supported anymore since they are associated to ``ceph-disk``:
|
|
|
|
* `collocated`
|
|
* `non-collocated`
|
|
|
|
Since the Ceph luminous release, it is preferred to use the :ref:`lvm scenario
|
|
<osd_scenario_lvm>` that uses the ``ceph-volume`` provisioning tool. Any other
|
|
scenario will cause deprecation warnings.
|
|
|
|
``ceph-disk`` was deprecated during the ceph-ansible 3.2 cycle and has been removed entirely from Ceph itself in the Nautilus version.
|
|
At present (starting from stable-4.0), there is only one scenario, which defaults to ``lvm``, see:
|
|
|
|
* :ref:`lvm <osd_scenario_lvm>`
|
|
|
|
So there is no need to configure ``osd_scenario`` anymore, it defaults to ``lvm``.
|
|
|
|
The ``lvm`` scenario mentioned above support both containerized and non-containerized cluster.
|
|
As a reminder, deploying a containerized cluster can be done by setting ``containerized_deployment``
|
|
to ``True``.
|
|
|
|
If you want to skip OSD creation during a ``ceph-ansible run``
|
|
(e.g. because you have already provisioned your OSDs but disk IDs have
|
|
changed), you can skip the ``prepare_osd`` tag i.e. by specifying
|
|
``--skip-tags prepare_osd`` on the ``ansible-playbook`` command line.
|
|
|
|
.. _osd_scenario_lvm:
|
|
|
|
lvm
|
|
---
|
|
|
|
This OSD scenario uses ``ceph-volume`` to create OSDs, primarily using LVM, and
|
|
is only available when the Ceph release is luminous or newer.
|
|
It is automatically enabled.
|
|
|
|
Other (optional) supported settings:
|
|
|
|
- ``osd_objectstore``: Set the Ceph *objectstore* for the OSD. Available options
|
|
are ``filestore`` or ``bluestore``. You can only select ``bluestore`` with
|
|
the Ceph release is luminous or greater. Defaults to ``bluestore`` if unset.
|
|
|
|
- ``dmcrypt``: Enable Ceph's encryption on OSDs using ``dmcrypt``.
|
|
Defaults to ``false`` if unset.
|
|
|
|
- ``osds_per_device``: Provision more than 1 OSD (the default if unset) per device.
|
|
|
|
|
|
Simple configuration
|
|
^^^^^^^^^^^^^^^^^^^^
|
|
|
|
With this approach, most of the decisions on how devices are configured to
|
|
provision an OSD are made by the Ceph tooling (``ceph-volume lvm batch`` in
|
|
this case). There is almost no room to modify how the OSD is composed given an
|
|
input of devices.
|
|
|
|
To use this configuration, the ``devices`` option must be populated with the
|
|
raw device paths that will be used to provision the OSDs.
|
|
|
|
|
|
.. note:: Raw devices must be "clean", without a gpt partition table, or
|
|
logical volumes present.
|
|
|
|
|
|
For example, for a node that has ``/dev/sda`` and ``/dev/sdb`` intended for
|
|
Ceph usage, the configuration would be:
|
|
|
|
|
|
.. code-block:: yaml
|
|
|
|
devices:
|
|
- /dev/sda
|
|
- /dev/sdb
|
|
|
|
In the above case, if both devices are spinning drives, 2 OSDs would be
|
|
created, each with its own collocated journal.
|
|
|
|
Other provisioning strategies are possible, by mixing spinning and solid state
|
|
devices, for example:
|
|
|
|
.. code-block:: yaml
|
|
|
|
devices:
|
|
- /dev/sda
|
|
- /dev/sdb
|
|
- /dev/nvme0n1
|
|
|
|
Similar to the initial example, this would end up producing 2 OSDs, but data
|
|
would be placed on the slower spinning drives (``/dev/sda``, and ``/dev/sdb``)
|
|
and journals would be placed on the faster solid state device ``/dev/nvme0n1``.
|
|
The ``ceph-volume`` tool describes this in detail in
|
|
`the "batch" subcommand section <http://docs.ceph.com/docs/master/ceph-volume/lvm/batch/>`_
|
|
|
|
This option can also be used with ``osd_auto_discovery``, meaning that you do not need to populate
|
|
``devices`` directly and any appropriate devices found by ansible will be used instead.
|
|
|
|
.. code-block:: yaml
|
|
|
|
osd_auto_discovery: true
|
|
|
|
Other (optional) supported settings:
|
|
|
|
- ``crush_device_class``: Sets the CRUSH device class for all OSDs created with this
|
|
method (it is not possible to have a per-OSD CRUSH device class using the *simple*
|
|
configuration approach). Values *must be* a string, like
|
|
``crush_device_class: "ssd"``
|
|
|
|
|
|
Advanced configuration
|
|
^^^^^^^^^^^^^^^^^^^^^^
|
|
|
|
This configuration is useful when more granular control is wanted when setting
|
|
up devices and how they should be arranged to provision an OSD. It requires an
|
|
existing setup of volume groups and logical volumes (``ceph-volume`` will **not**
|
|
create these).
|
|
|
|
To use this configuration, the ``lvm_volumes`` option must be populated with
|
|
logical volumes and volume groups. Additionally, absolute paths to partitions
|
|
*can* be used for ``journal``, ``block.db``, and ``block.wal``.
|
|
|
|
.. note:: This configuration uses ``ceph-volume lvm create`` to provision OSDs
|
|
|
|
Supported ``lvm_volumes`` configuration settings:
|
|
|
|
- ``data``: The logical volume name or full path to a raw device (an LV will be
|
|
created using 100% of the raw device)
|
|
|
|
- ``data_vg``: The volume group name, **required** if ``data`` is a logical volume.
|
|
|
|
- ``crush_device_class``: CRUSH device class name for the resulting OSD, allows
|
|
setting set the device class for each OSD, unlike the global ``crush_device_class``
|
|
that sets them for all OSDs.
|
|
|
|
.. note:: If you wish to set the ``crush_device_class`` for the OSDs
|
|
when using ``devices`` you must set it using the global ``crush_device_class``
|
|
option as shown above. There is no way to define a specific CRUSH device class
|
|
per OSD when using ``devices`` like there is for ``lvm_volumes``.
|
|
|
|
|
|
``filestore`` objectstore variables:
|
|
|
|
- ``journal``: The logical volume name or full path to a partition.
|
|
|
|
- ``journal_vg``: The volume group name, **required** if ``journal`` is a logical volume.
|
|
|
|
.. warning:: Each entry must be unique, duplicate values are not allowed
|
|
|
|
|
|
``bluestore`` objectstore variables:
|
|
|
|
- ``db``: The logical volume name or full path to a partition.
|
|
|
|
- ``db_vg``: The volume group name, **required** if ``db`` is a logical volume.
|
|
|
|
- ``wal``: The logical volume name or full path to a partition.
|
|
|
|
- ``wal_vg``: The volume group name, **required** if ``wal`` is a logical volume.
|
|
|
|
|
|
.. note:: These ``bluestore`` variables are optional optimizations. Bluestore's
|
|
``db`` and ``wal`` will only benefit from faster devices. It is possible to
|
|
create a bluestore OSD with a single raw device.
|
|
|
|
.. warning:: Each entry must be unique, duplicate values are not allowed
|
|
|
|
|
|
``bluestore`` example using raw devices:
|
|
|
|
.. code-block:: yaml
|
|
|
|
osd_objectstore: bluestore
|
|
lvm_volumes:
|
|
- data: /dev/sda
|
|
- data: /dev/sdb
|
|
|
|
.. note:: Volume groups and logical volumes will be created in this case,
|
|
utilizing 100% of the devices.
|
|
|
|
``bluestore`` example with logical volumes:
|
|
|
|
.. code-block:: yaml
|
|
|
|
osd_objectstore: bluestore
|
|
lvm_volumes:
|
|
- data: data-lv1
|
|
data_vg: data-vg1
|
|
- data: data-lv2
|
|
data_vg: data-vg2
|
|
|
|
.. note:: Volume groups and logical volumes must exist.
|
|
|
|
|
|
``bluestore`` example defining ``wal`` and ``db`` logical volumes:
|
|
|
|
.. code-block:: yaml
|
|
|
|
osd_objectstore: bluestore
|
|
lvm_volumes:
|
|
- data: data-lv1
|
|
data_vg: data-vg1
|
|
db: db-lv1
|
|
db_vg: db-vg1
|
|
wal: wal-lv1
|
|
wal_vg: wal-vg1
|
|
- data: data-lv2
|
|
data_vg: data-vg2
|
|
db: db-lv2
|
|
db_vg: db-vg2
|
|
wal: wal-lv2
|
|
wal_vg: wal-vg2
|
|
|
|
.. note:: Volume groups and logical volumes must exist.
|
|
|
|
|
|
``filestore`` example with logical volumes:
|
|
|
|
.. code-block:: yaml
|
|
|
|
osd_objectstore: filestore
|
|
lvm_volumes:
|
|
- data: data-lv1
|
|
data_vg: data-vg1
|
|
journal: journal-lv1
|
|
journal_vg: journal-vg1
|
|
- data: data-lv2
|
|
data_vg: data-vg2
|
|
journal: journal-lv2
|
|
journal_vg: journal-vg2
|
|
|
|
.. note:: Volume groups and logical volumes must exist.
|