cinder/doc/source/contributor/architecture.rst
Sean McGinnis d5b539be36
Doc8: Stop skipping D001: Line too long
This cleans up the cases where we had D001 violations so we can stop
skipping that check in doc8 runs.

Change-Id: Ie52f6ecac1a645fcbcc643b9ca63e033b622d830
Signed-off-by: Sean McGinnis <sean.mcginnis@gmail.com>
2019-02-19 16:51:56 -06:00

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..
Copyright 2010-2011 United States Government as represented by the
Administrator of the National Aeronautics and Space Administration.
All Rights Reserved.
Licensed under the Apache License, Version 2.0 (the "License"); you may
not use this file except in compliance with the License. You may obtain
a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
License for the specific language governing permissions and limitations
under the License.
Cinder System Architecture
==========================
The Cinder Block Storage Service is intended to be ran on one or more nodes.
Cinder uses a sql-based central database that is shared by all Cinder services
in the system. The amount and depth of the data fits into a sql database quite
well. For small deployments this seems like an optimal solution. For larger
deployments, and especially if security is a concern, cinder will be moving
towards multiple data stores with some kind of aggregation system.
Components
----------
Below you will find a brief explanation of the different components.
::
/- ( LDAP )
[ Auth Manager ] ---
| \- ( DB )
|
|
cinderclient |
/ \ | /- [ scheduler ] -- [ volume ] -- ( iSCSI )
[ Web Dashboard ]- -[ api ] -- < AMQP > --
\ / | \- [ backup ]
novaclient |
|
|
|
< REST >
* DB: sql database for data storage. Used by all components (LINKS NOT SHOWN).
* Web Dashboard: potential external component that talks to the api.
* api: component that receives http requests, converts commands and
communicates with other components via the queue or http.
* Auth Manager: component responsible for users/projects/and roles. Can backend
to DB or LDAP. This is not a separate binary, but rather a python class that
is used by most components in the system.
* scheduler: decides which host gets each volume.
* volume: manages dynamically attachable block devices.
* backup: manages backups of block storage devices.