Merge "Add docs on building images"
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Zuul
Gerrit Code Review
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@ -55,7 +55,7 @@ kolla_node_custom_config_path: "{{ kolla_config_path }}/config"
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# Kolla base container image distribution.
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kolla_base_distro: "centos"
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# Kolla installation type: binary or source.
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# Kolla container image type: binary or source.
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kolla_install_type: "binary"
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# Docker namespace to use for Kolla images.
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@ -9,4 +9,5 @@ Configuration Guide
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physical-network
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network
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hosts
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kolla
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kolla-ansible
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@ -0,0 +1,310 @@
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===================
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Kolla Configuration
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===================
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Anyone using Kayobe to build images should familiarise themselves with the
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`Kolla project's documentation
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<https://docs.openstack.org/kolla/latest/>`__.
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Container Image Build Host
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==========================
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Images are built on hosts in the ``container-image-builders`` group. The
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default Kayobe Ansible inventory places the seed host in this group, although
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it is possible to put a different host in the group, by modifying the
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inventory.
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For example, to build images on ``localhost``:
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.. code-block:: console
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:caption: ``inventory/groups``
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[container-image-builders:children]
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.. code-block:: console
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:caption: ``inventory/hosts``
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[container-image-builders]
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localhost
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Kolla Installation
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==================
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Prior to building container images, Kolla and its dependencies will be
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installed on the container image build host. The following variables affect the
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installation of Kolla:
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``kolla_ctl_install_type``
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Type of installation, either ``binary`` (PyPI) or ``source`` (git). Default
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is ``source``.
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``kolla_source_path``
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Path to directory for Kolla source code checkout. Default is ``{{
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source_checkout_path ~ '/kolla' }}``.
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``kolla_source_url``
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URL of Kolla source code repository if type is ``source``. Default is
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https://git.openstack.org/openstack/kolla.
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``kolla_source_version``
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Version (branch, tag, etc.) of Kolla source code repository if type is
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``source``. Default is the same as the Kayobe upstream branch name.
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``kolla_venv``
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Path to virtualenv in which to install Kolla on the container image build
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host. Default is ``{{ virtualenv_path ~ '/kolla' }}``.
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``kolla_build_config_path``
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Path in which to generate kolla configuration. Default is ``{{ config_path
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~ '/kolla' }}``.
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For example, to install from a custom Git repository:
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.. code-block:: yaml
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:caption: ``kolla.yml``
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kolla_source_url: https://git.example.com/kolla
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kolla_source_version: downstream
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Global Configuration
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====================
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The following variables are global, affecting all container images. They are
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used to generate the Kolla configuration file, ``kolla-build.conf``.
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``kolla_base_distro``
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Kolla base container image distribution. Default is ``centos``.
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``kolla_install_type``
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Kolla container image type: ``binary`` or ``source``. Default is
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``binary``.
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``kolla_docker_namespace``
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Docker namespace to use for Kolla images. Default is ``kolla``.
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``kolla_docker_registry``
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URL of docker registry to use for Kolla images. Default is not set, in
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which case Dockerhub will be used.
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``kolla_docker_registry_username``
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Username to use to access a docker registry. Default is not set, in which
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case the registry will be used without authentication.
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``kolla_docker_registry_password``
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Password to use to access a docker registry. Default is not set, in which
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case the registry will be used without authentication.
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``kolla_openstack_release``
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Kolla OpenStack release version. This should be a Docker image tag. Default
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is the OpenStack release name (e.g. ``rocky``) on stable branches and
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tagged releases, or ``master`` on the Kayobe ``master`` branch.
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For example, to build the Kolla ``centos`` ``binary`` images with a namespace
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of ``example``, and a private Docker registry at ``registry.example.com:4000``,
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tagged with ``7.0.0.1``:
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.. code-block:: yaml
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:caption: ``kolla.yml``
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kolla_base_distro: centos
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kolla_install_type: binary
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kolla_docker_namespace: example
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kolla_docker_registry: registry.example.com:4000
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kolla_openstack_release: 7.0.0.1
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The ``ironic-api`` image built with this configuration would be referenced as
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follows:
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.. code-block:: console
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registry.example.com:4000/example/centos-binary-ironic-api:7.0.0.1
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Further customisation of the Kolla configuration file can be performed by
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writing a file at ``${KAYOBE_CONFIG_PATH/kolla/kolla-build.conf``. For example,
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to enable debug logging:
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.. code-block:: ini
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:caption: ``kolla/kolla-build.conf``
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[DEFAULT]
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debug = True
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Seed Images
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===========
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The ``kayobe seed container image build`` command builds images for the seed
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services. The only image required for the seed services is the
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``bifrost-deploy`` image.
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Overcloud Images
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================
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The ``kayobe overcloud container image build`` command builds images for the
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control plane. The default set of images built depends on which services and
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features are enabled via the ``kolla_enable_<service>`` flags in
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``$KAYOBE_CONFIG_PATH/kolla.yml``.
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For example, the following configuration will enable the Magnum service and add
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the ``magnum-api`` and ``magnum-conductor`` containers to the set of overcloud
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images that will be built:
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.. code-block:: yaml
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:caption: ``kolla.yml``
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kolla_enable_magnum: true
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If a required image is not built when the corresponding flag is set, check the
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image sets defined in ``overcloud_container_image_sets`` in
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``ansible/group_vars/all/kolla``.
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Image Customisation
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===================
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There are three main approaches to customising the Kolla container images:
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#. Overriding Jinja2 blocks
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#. Overriding Jinja2 variables
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#. Source code locations
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Overriding Jinja2 blocks
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------------------------
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Kolla's images are defined via Jinja2 templates that generate Dockerfiles.
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Jinja2 blocks are frequently used to allow specific statements in one or more
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Dockerfiles to be replaced with custom statements. See the `Kolla documentation
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<https://docs.openstack.org/kolla/latest/admin/image-building.html#generic-customisation>`__
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for details.
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Blocks are configured via the ``kolla_build_blocks`` variable, which is a dict
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mapping Jinja2 block names in to their contents.
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For example, to override the block ``header`` to add a custom label to every
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image:
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.. code-block:: yaml
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:caption: ``kolla.yml``
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kolla_build_blocks:
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header: |
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LABEL foo="bar"
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This will result in Kayobe generating a ``template-override.j2`` file with the
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following content:
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.. code-block:: console
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:caption: ``template-override.j2``
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{% extends parent_template %}
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{% block header %}
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LABEL foo="bar"
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{% endblock %}
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Overriding Jinja2 variables
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---------------------------
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Jinja2 variables offer another way to customise images. See the `Kolla
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documentation
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<https://docs.openstack.org/kolla/latest/admin/image-building.html#package-customisation>`__
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for details of using variable overrides to modify the list of packages to
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install in an image.
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Variable overrides are configured via the ``kolla_build_customizations``
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variable, which is a dict/map mapping names of variables to override to their
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values.
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For example, to add ``mod_auth_openidc`` to the list of packages installed in
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the ``keystone-base`` image, we can set the variable
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``keystone_base_packages_append`` to a list containing ``mod_auth_openidc``.
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.. code-block:: yaml
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:caption: ``kolla.yml``
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kolla_build_customizations:
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keystone_base_packages_append:
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- mod_auth_openidc
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This will result in Kayobe generating a ``template-override.j2`` file with the
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following content:
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.. code-block:: console
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:caption: ``template-override.j2``
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{% extends parent_template %}
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{% set keystone_base_packages_append = ["mod_auth_openidc"] %}
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Note that the variable value will be JSON-encoded in ``template-override.j2``.
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Source code locations
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---------------------
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For ``source`` image builds, configuration of source code locations for
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packages installed in containers by Kolla is possible via the ``kolla_sources``
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variable. The format is a dict/map mapping names of sources to their
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definitions. See the `Kolla documentation
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<https://docs.openstack.org/kolla/latest/admin/image-building.html#build-openstack-from-source>`__
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for details. The default is to specify the URL and version of Bifrost, as
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defined in ``${KAYOBE_CONFIG_PATH}/bifrost.yml``.
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For example, to specify a custom source location for the ``ironic-base``
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package:
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.. code-block:: yaml
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:caption: ``kolla.yml``
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kolla_sources:
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bifrost-base:
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type: "git"
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location: "{{ kolla_bifrost_source_url }}"
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reference: "{{ kolla_bifrost_source_version }}"
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ironic-base:
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type: "git"
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location: https://git.example.com/ironic
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reference: downstream
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This will result in Kayobe adding the following configuration to
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``kolla-build.conf``:
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.. code-block:: ini
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:caption: ``kolla-build.conf``
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[bifrost-base]
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type = git
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location = https://git.openstack.org/openstack/bifrost
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reference = stable/rocky
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[ironic-base]
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type = git
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location = https://git.example.com/ironic
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reference = downstream
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Note that is is currently necessary to include the Bifrost source location if
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using a seed.
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Plugins & additions
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-------------------
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These features can also be used for installing `plugins
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<https://docs.openstack.org/kolla/latest/admin/image-building.html#plugin-functionality>`__
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and `additions
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<https://docs.openstack.org/kolla/latest/admin/image-building.html#additions-functionality>`__
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to ``source`` type images.
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For example, to install a ``networking-ansible`` plugin in the
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``neutron-server`` image:
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.. code-block:: yaml
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:caption: ``kolla.yml``
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kolla_sources:
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bifrost-base:
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type: "git"
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location: "{{ kolla_bifrost_source_url }}"
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reference: "{{ kolla_bifrost_source_version }}"
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neutron-server-plugin-networking-ansible:
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type: "git"
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location: https://git.example.com/networking-ansible
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reference: downstream
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The ``neutron-server`` image automatically installs any plugins provided to it.
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For images that do not, a block such as the following may be required:
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.. code-block:: yaml
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:caption: ``kolla.yml``
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kolla_build_blocks:
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neutron_server_footer: |
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ADD plugins-archive /
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pip --no-cache-dir install /plugins/*
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A similar approach may be used for additions.
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@ -57,7 +57,7 @@
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# Kolla base container image distribution.
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#kolla_base_distro:
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# Kolla installation type: binary or source.
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# Kolla container image type: binary or source.
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#kolla_install_type:
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# URL of docker registry to use for Kolla images.
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