f44644f20f
The reality is that "stable" is what is tested. This tries to give enough info that users can ascertain what tests are running at any given time and hence what elements are known to be working. Additional, clarify the Fedora position in the README as now described by above. Closes: #1653561 Change-Id: Ifb91b9089790897861bd7e671c3dba59adac239d
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4.9 KiB
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123 lines
4.9 KiB
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Tested Distributions
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--------------------
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``diskimage-builder`` can create many different types of targets
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composed of many different elements. For any release, the project
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considers the elements tested by the OpenDev gate
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continuous-integration jobs as stable.
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Practically, this means a change can not commit unless it has
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successfully built the elements described below under test.
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Build Host
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==========
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The build-host is the platform used to create images. Unfortunately
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there is no concise answer as to the support status of all possible
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build-hosts. ``diskimage-builder`` has a complex relationship with
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the build-host depending on which target elements are being built.
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Image-based elements take an upstream ``.qcow2`` image, extract and
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customise it. Since ``diskimage-builder`` chroots into an
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already-complete environment, these elements generally work on any
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build-host, but there are complexities; for example some images ship
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an XFS-filesystem with options that some stable-distribution
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build-hosts can not read (and hence the build-host can not mount and
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extract the image).
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As another example, the ``-minimal`` elements run tools such as
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``yum``, ``dnf``, ``apt`` on the build-host to create an initial
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``chroot`` environment. Thus some combinations will not work; for
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example ``fedora-minimal`` for the latest versions may require a RPM
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that is not packaged on current stable versions of Ubuntu. Some
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versions of Ubuntu ship a ``debootstrap`` that has bugs preventing
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building other distributions, etc.
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Finally the ``containerfile`` elements use ``podman`` to extract a
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container-image and then customise that. Distributions vary in their
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podman version and various bugs related to this.
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The images used by the OpenDev's `Zuul <https://zuul-ci.org>`__ system
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are built by `Nodepool <https://zuul-ci.org/docs/nodepool/>`__. Thus
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the simplest way to have the most supported build-host environment is
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to use ``diskimage-buidler`` installed in the `nodepool-builder
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container image <https://hub.docker.com/r/zuul/nodepool-builder>`__.
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You can run ``disk-image-create`` directly from this container, e.g.
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::
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docker run --rm --privileged --network host \
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--env DIB_SHOW_IMAGE_USAGE=1 \
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--env TMPDIR=/opt/dib_tmp \
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-v nested_var_lib_containers:/var/lib/containers \
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-v /var/run/dib_output:/var/run/dib_output \
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-v /opt/dib_tmp:/opt/dib_tmp \
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zuul/nodepool-builder disk-image-create -x -t qcow2 \
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--no-tmpfs \
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-o /var/run/dib_output/image -n <element(s)>
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The platform this container image is built upon is by extension the
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most-supported build host. Inspecting the `Dockerfile
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<https://opendev.org/zuul/nodepool/src/branch/master/Dockerfile>`__ is
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a good way to start building customised build-host environments. This
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is currently based on Debian Bullsye.
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Other distributions are not tested as build-hosts in the
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``diskimage-builder`` gate.
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Testing and Targets
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===================
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The stable targets are those that are tested; as noted no change can
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commit which would break this testing.
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There are two main testing paths:
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* end-to-end tests build an image, import it to an OpenStack
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environment, boot it and confirm basic operation. These tests use
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the ``nodepool-builder`` container environment to build the image to
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be tested.
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* functional tests build a complete output image. They do not perform
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boot tests. These tests run on Debian Bullseye.
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The canonical list of tests and the elements they build for any releae
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is kept in `.zuul.yaml/jobs.yaml
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<https://opendev.org/openstack/diskimage-builder/src/branch/master/.zuul.d/jobs.yaml>`__.
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If this document differs to the defined tests, the Zuul configuration
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is correct.
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As of Feburary 2022, the default end-to-end testing covers the
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following elements on x86-64
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* ``centos-minimal``: CentOS 7, 8-stream and 9-stream
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* ``fedora-containerfile``: the latest Fedora.
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* ``ubuntu-minimal``: Ubuntu Xenial, Bionic and Focal
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* ``opensuse-minimal``: Leap 15.3 and Tumbleweed (non-voting)
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* ``gentoo``: (non-voting)
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* ``debian-minimal``: Bullseye
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* ``rocky-container``: Rocky Linux 8
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We run functional (build-only) tests on the following elements and
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versions:
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* ``containerfile``: Ubuntu Focal
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* ``openeuler-minimal``: 20.03-LTS-SP2
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* ``centos`` : (image-based build) 8-stream and 9-stream
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* ``fedora`` : (image-based build) latest
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* ``opensuse`` : 15.3
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* ``ubuntu`` : Bionic and Focal
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For ARM64, we also run functional tests on
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* ``ubuntu-minimal`` : Bionic and Focal
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* ``debian-minimal`` : Bullseye
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* ``centos-minimal`` : 8-stream and 9-stream
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* ``openeuler-minimal``: 20.03-LTS-SP2
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For additional details, see the ``README`` file of the relevant
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elements.
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``diskimage-builder`` is used in a range of other projects that do
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their own testing, separate to the ``diskimage-buidler`` CI gate
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testing. These have different combinations of host/target elements
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they keep stable. Updates to this document are welcome.
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