105 lines
4.9 KiB
ReStructuredText
105 lines
4.9 KiB
ReStructuredText
lorax-composer
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==============
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:Authors:
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Brian C. Lane <bcl@redhat.com>
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lorax-composer is an API server that is compatible with the Weldr project's
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bdcs-api REST protocol. More information on Weldr can be found `on the Weldr
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blog <http://www.weldr.io>`_.
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The server runs as root, and communication with it is via a unix domain socket
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(``/run/weldr/api.socket`` by default). The directory and socket are owned by
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root:weldr so that any user in the weldr group can use the API to control
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lorax-composer.
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When starting the server it will check for the correct permissions and
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ownership of a pre-existing directory, or it will create a new one if it
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doesn't exist. The socket path and group owner's name can be changed from the
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cmdline by passing it the ``--socket`` and ``--group`` arguments.
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As of version 19.7.7 it will drop root privileges for the API thread. The queue
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and compose thread still runs as root because it needs to be able to
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mount/umount files and run Anaconda.
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Logs
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----
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Logs are stored under ``/var/log/lorax-composer/`` and include all console
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messages as well as extra debugging info and API requests.
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Quickstart
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----------
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1. Create a ``weldr`` user and group by running ``useradd weldr``
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2. Remove any pre-existing socket directory with ``rm -rf /run/weldr/``
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A new directory with correct permissions will be created the first time the server runs.
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3. Either start it via systemd with ``systemctl start lorax-composer`` or
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run it directly with ``lorax-composer /path/to/blueprints/``
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The ``/path/to/blueprints/`` is where the blueprint's git repo will be created, and
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all the blueprints created with the ``/api/v0/blueprints/new`` route will be stored.
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If there are blueprint ``.toml`` files in the top level of the directory they will
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be imported into the blueprint git storage.
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Composing Images
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----------------
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As of version 19.7.7 lorax-composer can create ``tar`` output images. You can use curl to start
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a compose like this::
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curl --unix-socket /run/weldr/api.socket -X POST -H "Content-Type: application/json" -d '{"blueprint_name": "http-server", "compose_type": "tar", "branch": "master"}' http:///api/v0/compose
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And then monitor it by passing the returned build UUID to ``/compose/status/<uuid>``.
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Version 19.7.10 adds support for ``live-iso`` and ``partitioned-disk``
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Adding Output Types
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-------------------
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livemedia-creator supports a large number of output types, and only some of
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these are currently available via lorax-composer. To add a new output type to
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lorax-composer a kickstart file needs to be added to ``./share/composer/``. The
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name of the kickstart is what will be used by the ``/compose/types`` route, and the
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``compose_type`` field of the POST to start a compose. It also needs to have
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code added to the :py:func:`pylorax.api.compose.compose_args` function. The
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``_MAP`` entry in this function defines what lorax-composer will pass to
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:py:func:`pylorax.installer.novirt_install` when it runs the compose. When the
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compose is finished the output files need to be copied out of the build
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directory (``/var/lib/lorax/composer/results/<UUID>/compose/``),
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:py:func:`pylorax.api.compose.move_compose_results` handles this for each type.
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You should move them instead of copying to save space.
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If the new output type does not have support in livemedia-creator it should be
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added there first. This will make the output available to the widest number of
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users.
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Example: Add partitioned disk support
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Partitioned disk support is something that livemedia-creator already supports
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via the ``--make-disk`` cmdline argument. To add this to lorax-composer it
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needs 3 things:
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* A ``partitioned-disk.ks`` file in ``./share/composer/``
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* A new entry in the _MAP in :py:func:`pylorax.api.compose.compose_args`
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* Add a bit of code to :py:func:`pylorax.api.compose.move_compose_results` to move the disk image from
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the compose directory to the results directory.
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The ``partitioned-disk.ks`` is pretty similar to the example minimal kickstart
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in ``./docs/rhel7-minimal.ks``. You should remove the ``url`` and ``repo``
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commands, they will be added by the compose process. Make sure the bootloader
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packages are included in the ``%packages`` section at the end of the kickstart,
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and you will want to leave off the ``%end`` so that the compose can append the
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list of packages from the blueprint.
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The new ``_MAP`` entry should be a copy of one of the existing entries, but with ``make_disk`` set
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to ``True``. Make sure that none of the other ``make_*`` options are ``True``. The ``image_name`` is
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what the name of the final image will be.
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``move_compose_results()`` can be as simple as moving the output file into
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the results directory, or it could do some post-processing on it. The end of
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the function should always clean up the ``./compose/`` directory, removing any
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unneeded extra files. This is especially true for the ``live-iso`` since it produces
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the contents of the iso as well as the boot.iso itself.
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