Add documentation for ironic-dbsync command
This adds a new documentation section for the ironic commands. The ironic-dbsync command is the first to be documented. Change-Id: I166a00005092fb7e87b856e7ceca2b88b6eae322
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David Shrewsbury
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doc/source/cmds/ironic-dbsync.rst
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doc/source/cmds/ironic-dbsync.rst
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=============
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ironic-dbsync
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=============
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The :command:`ironic-dbsync` utility is used to create the database schema
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tables that the ironic services will use for storage. It can also be used to
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upgrade (or downgrade) existing database tables when migrating between
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different versions of ironic.
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The `Alembic library <http://alembic.readthedocs.org>`_ is used to perform
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the database migrations.
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Options
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=======
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This is a partial list of the most useful options. To see the full list,
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run the following::
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ironic-dbsync --help
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.. program:: ironic-dbsync
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.. option:: -h, --help
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Show help message and exit.
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.. option:: --config-dir <DIR>
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Path to a config directory with configuration files.
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.. option:: --config-file <PATH>
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Path to a configuration file to use.
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.. option:: -d, --debug
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Print debugging output.
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.. option:: -v, --verbose
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Print more verbose output.
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.. option:: --version
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Show the program's version number and exit.
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.. option:: upgrade, downgrade, stamp, revision, version, create_schema
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The :ref:`command <dbsync_cmds>` to run.
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Usage
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=====
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Options for the various :ref:`commands <dbsync_cmds>` for
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:command:`ironic-dbsync` are listed when the :option:`-h` or :option:`--help`
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option is used after the command.
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For example::
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ironic-dbsync create_schema --help
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Information about the database is read from the ironic configuration file
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used by the API server and conductor services. This file must be specified
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with the :option:`--config-file` option::
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ironic-dbsync --config-file /path/to/ironic.conf create_schema
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The configuration file defines the database backend to use with the
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*connection* database option::
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[database]
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connection=mysql://root@localhost/ironic
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If no configuration file is specified with the :option:`--config-file` option,
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:command:`ironic-dbsync` assumes an SQLite database.
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.. _dbsync_cmds:
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Command Options
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===============
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:command:`ironic-dbsync` is given a command that tells the utility what actions
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to perform. These commands can take arguments. Several commands are available:
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.. _create_schema:
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create_schema
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-------------
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.. program:: create_schema
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.. option:: -h, --help
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Show help for create_schema and exit.
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This command will create database tables based on the most current version.
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It assumes that there are no existing tables.
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An example of creating database tables with the most recent version::
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ironic-dbsync --config-file=/etc/ironic/ironic.conf create_schema
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downgrade
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---------
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.. program:: downgrade
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.. option:: -h, --help
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Show help for downgrade and exit.
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.. option:: --revision <REVISION>
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The revision number you want to downgrade to.
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This command will revert existing database tables to a previous version.
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The version can be specified with the :option:`--revision` option.
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An example of downgrading to table versions at revision 2581ebaf0cb2::
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ironic-dbsync --config-file=/etc/ironic/ironic.conf downgrade --revision 2581ebaf0cb2
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revision
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--------
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.. program:: revision
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.. option:: -h, --help
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Show help for revision and exit.
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.. option:: -m <MESSAGE>, --message <MESSAGE>
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The message to use with the revision file.
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.. option:: --autogenerate
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Compares table metadata in the application with the status of the database
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and generates migrations based on this comparison.
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This command will create a new revision file. You can use the
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:option:`--message` option to comment the revision.
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This is really only useful for ironic developers making changes that require
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database changes. This revision file is used during database migration and
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will specify the changes that need to be made to the database tables. Further
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discussion is beyond the scope of this document.
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stamp
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-----
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.. program:: stamp
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.. option:: -h, --help
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Show help for stamp and exit.
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.. option:: --revision <REVISION>
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The revision number.
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This command will 'stamp' the revision table with the version specified with
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the :option:`--revision` option. It will not run any migrations.
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upgrade
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-------
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.. program:: upgrade
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.. option:: -h, --help
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Show help for upgrade and exit.
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.. option:: --revision <REVISION>
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The revision number to upgrade to.
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This command will upgrade existing database tables to the most recent version,
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or to the version specified with the :option:`--revision` option.
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If there are no existing tables, then new tables are created, beginning
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with the oldest known version, and successively upgraded using all of the
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database migration files, until they are at the specified version. Note
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that this behavior is different from the :ref:`create_schema` command
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that creates the tables based on the most recent version.
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An example of upgrading to the most recent table versions::
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ironic-dbsync --config-file=/etc/ironic/ironic.conf upgrade
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.. note::
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This command is the default if no command is given to
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:command:`ironic-dbsync`.
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.. warning::
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The upgrade command is not compatible with SQLite databases since it uses
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ALTER TABLE commands to upgrade the database tables. SQLite supports only
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a limited subset of ALTER TABLE.
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version
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-------
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.. program:: version
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.. option:: -h, --help
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Show help for version and exit.
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This command will output the current database version.
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@ -55,7 +55,7 @@ Admin Guide
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===========
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===========
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Overview
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Overview
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----------
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--------
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.. toctree::
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:maxdepth: 1
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:maxdepth: 1
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deploy/install-guide
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deploy/install-guide
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deploy/drivers
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deploy/drivers
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Commands
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--------
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.. toctree::
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:maxdepth: 1
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cmds/ironic-dbsync
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Indices and tables
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Indices and tables
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==================
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==================
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