mirror of
https://github.com/ceph/ceph
synced 2024-12-13 23:17:07 +00:00
97 lines
3.2 KiB
ReStructuredText
97 lines
3.2 KiB
ReStructuredText
============
|
|
Sync Modules
|
|
============
|
|
|
|
.. versionadded:: Kraken
|
|
|
|
The `Multisite`_ functionality of RGW introduced in Jewel allowed the ability to
|
|
create multiple zones and mirror data and metadata between them. ``Sync Modules``
|
|
are built atop of the multisite framework that allows for forwarding data and
|
|
metadata to a different external tier. A sync module allows for a set of actions
|
|
to be performed whenever a change in data occurs (metadata ops like bucket or
|
|
user creation etc. are also regarded as changes in data). As the rgw multisite
|
|
changes are eventually consistent at remote sites, changes are propagated
|
|
asynchronously. This would allow for unlocking use cases such as backing up the
|
|
object storage to an external cloud cluster or a custom backup solution using
|
|
tape drives, indexing metadata in ElasticSearch etc.
|
|
|
|
A sync module configuration is local to a zone. The sync module determines
|
|
whether the zone exports data or can only consume data that was modified in
|
|
another zone. As of luminous the supported sync plugins are `elasticsearch`_,
|
|
``rgw``, which is the default sync plugin that synchronises data between the
|
|
zones and ``log`` which is a trivial sync plugin that logs the metadata
|
|
operation that happens in the remote zones. The following docs are written with
|
|
the example of a zone using `elasticsearch sync module`_, the process would be similar
|
|
for configuring any sync plugin
|
|
|
|
.. toctree::
|
|
:maxdepth: 1
|
|
|
|
ElasticSearch Sync Module <elastic-sync-module>
|
|
Cloud Sync Module <cloud-sync-module>
|
|
|
|
.. note ``rgw`` is the default sync plugin and there is no need to explicitly
|
|
configure this
|
|
|
|
Requirements and Assumptions
|
|
----------------------------
|
|
|
|
Let us assume a simple multisite configuration as described in the `Multisite`_
|
|
docs, of 2 zones ``us-east`` and ``us-west``, let's add a third zone
|
|
``us-east-es`` which is a zone that only processes metadata from the other
|
|
sites. This zone can be in the same or a different ceph cluster as ``us-east``.
|
|
This zone would only consume metadata from other zones and RGWs in this zone
|
|
will not serve any end user requests directly.
|
|
|
|
|
|
Configuring Sync Modules
|
|
------------------------
|
|
|
|
Create the third zone similar to the `Multisite`_ docs, for example
|
|
|
|
::
|
|
|
|
# radosgw-admin zone create --rgw-zonegroup=us --rgw-zone=us-east-es \
|
|
--access-key={system-key} --secret={secret} --endpoints=http://rgw-es:80
|
|
|
|
|
|
|
|
A sync module can be configured for this zone via the following
|
|
|
|
::
|
|
|
|
# radosgw-admin zone modify --rgw-zone={zone-name} --tier-type={tier-type} --tier-config={set of key=value pairs}
|
|
|
|
|
|
For example in the ``elasticsearch`` sync module
|
|
|
|
::
|
|
|
|
# radosgw-admin zone modify --rgw-zone={zone-name} --tier-type=elasticsearch \
|
|
--tier-config=endpoint=http://localhost:9200,num_shards=10,num_replicas=1
|
|
|
|
|
|
For the various supported tier-config options refer to the `elasticsearch sync module`_ docs
|
|
|
|
Finally update the period
|
|
|
|
|
|
::
|
|
|
|
# radosgw-admin period update --commit
|
|
|
|
|
|
Now start the radosgw in the zone
|
|
|
|
::
|
|
|
|
# systemctl start ceph-radosgw@rgw.`hostname -s`
|
|
# systemctl enable ceph-radosgw@rgw.`hostname -s`
|
|
|
|
|
|
|
|
.. _`Multisite`: ../multisite
|
|
.. _`elasticsearch sync module`: ../elastic-sync-module
|
|
.. _`elasticsearch`: ../elastic-sync-module
|
|
.. _`cloud sync module`: ../cloud-sync-module
|