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3.3 KiB
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89 lines
3.3 KiB
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.. _CONTRIBUTING:
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=================
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How To Contribute
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=================
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Basics
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======
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#. Our source code is hosted on `OpenStack Kolla Git`_. Bugs should be filed on
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launchpad_.
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#. Please follow OpenStack `Gerrit Workflow`_ to contribute to Kolla.
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#. Note the branch you're proposing changes to. ``master`` is the current focus
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of development. Kolla project has a strict policy of only allowing backports
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in ``stable/branch``, unless when not applicable. A bug in a
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``stable/branch`` will first have to be fixed in ``master``.
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#. Please file a launchpad_ blueprint for any significant code change and a bug
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for any significant bug fix. See how to reference a bug or a blueprint in
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the commit message here_. For simple changes, contributors may optionally
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add the text "TrivialFix" to the commit message footer to indicate to
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reviewers a bug is not required.
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.. _OpenStack Kolla Git: https://git.openstack.org/cgit/openstack/kolla/
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.. _launchpad: https://bugs.launchpad.net/kolla
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.. _here: https://wiki.openstack.org/wiki/GitCommitMessages
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Please use the existing sandbox repository, available at
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https://git.openstack.org/cgit/openstack-dev/sandbox, for learning, understanding
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and testing the `Gerrit Workflow`_.
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.. _Gerrit Workflow: https://docs.openstack.org/infra/manual/developers.html#development-workflow
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Adding a new service
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====================
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Kolla aims to both containerise and deploy all services within the OpenStack
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"big tent". This is a constantly moving target as the ecosystem grows, so these
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guidelines aim to help make adding a new service to Kolla a smooth experience.
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The image
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---------
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Kolla follows Docker best practices
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(https://docs.docker.com/engine/userguide/eng-image/dockerfile_best-practices/)
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when designing and implementing services where at all possible.
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We use ``jinja2`` templating syntax to help manage the volume and complexity
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that comes with maintaining multiple Dockerfiles for multiple different base
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operating systems.
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Images should be created under the ``docker`` directory. OpenStack services
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should inherit from the provided ``openstack-base`` image, while supporting and
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infrastructure services (e.g. mongodb) should inherit from ``base``.
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Services consisting of only one service should be placed in an image named the
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same as that service, e.g. ``horizon``. Services that consist of multiple
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processes generally use a base image and child images, e.g. ``glance-base``,
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``glance-api``, and ``glance-registry``.
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Jinja2 'blocks' are employed throughout the Dockerfile's to help operators
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customise various stages of the build (refer to
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https://docs.openstack.org/developer/kolla/image-building.html?highlight=override#dockerfile-customisation)
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Some of these blocks are free form however, there are a subset that should be
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common to every Dockerfile. The overall structure for a multi container service
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is as follows::
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FROM {{ namespace }}/{{ image_prefix }}openstack-base:{{ tag }}
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MAINTAINER {{ maintainer }}
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{% block << service >>_header %}{% endblock %}
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{% import "macros.j2" as macros with context %}
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<< binary specific steps >>
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<< source specific steps >>
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<< common steps >>
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{% block << service >>_footer %}{% endblock %}
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{% block footer %}{% endblock %}
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.. NOTE::
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The generic footer block ``{% block footer %}{% endblock %}`` should not be
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included in base images (e.g. glance-base).
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