40de78c284
To have the jobs dispatched to custom runners, gitlab-runner must be installed, active as a service and properly configured. The variables file and playbook introduced here should help with those steps. The playbook introduced here covers the Linux distributions and has been primarily tested on OS/machines that the QEMU project has available to act as runners, namely: * Ubuntu 20.04 on aarch64 * Ubuntu 18.04 on s390x But, it should work on all other Linux distributions. Earlier versions were tested on FreeBSD too, so chances of success are high. Signed-off-by: Cleber Rosa <crosa@redhat.com> Signed-off-by: Alex Bennée <alex.bennee@linaro.org> Tested-by: Willian Rampazzo <willianr@redhat.com> Tested-by: Alex Bennée <alex.bennee@linaro.org> Reviewed-by: Willian Rampazzo <willianr@redhat.com> Reviewed-by: Wainer dos Santos Moschetta <wainersm@redhat.com> Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Message-Id: <20210630012619.115262-4-crosa@redhat.com> Message-Id: <20210709143005.1554-4-alex.bennee@linaro.org>
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==
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CI
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==
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QEMU has configurations enabled for a number of different CI services.
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The most up to date information about them and their status can be
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found at::
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https://wiki.qemu.org/Testing/CI
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Jobs on Custom Runners
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======================
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Besides the jobs run under the various CI systems listed before, there
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are a number additional jobs that will run before an actual merge.
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These use the same GitLab CI's service/framework already used for all
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other GitLab based CI jobs, but rely on additional systems, not the
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ones provided by GitLab as "shared runners".
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The architecture of GitLab's CI service allows different machines to
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be set up with GitLab's "agent", called gitlab-runner, which will take
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care of running jobs created by events such as a push to a branch.
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Here, the combination of a machine, properly configured with GitLab's
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gitlab-runner, is called a "custom runner".
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The GitLab CI jobs definition for the custom runners are located under::
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.gitlab-ci.d/custom-runners.yml
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Custom runners entail custom machines. To see a list of the machines
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currently deployed in the QEMU GitLab CI and their maintainers, please
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refer to the QEMU `wiki <https://wiki.qemu.org/AdminContacts>`__.
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Machine Setup Howto
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-------------------
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For all Linux based systems, the setup can be mostly automated by the
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execution of two Ansible playbooks. Create an ``inventory`` file
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under ``scripts/ci/setup``, such as this::
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fully.qualified.domain
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other.machine.hostname
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You may need to set some variables in the inventory file itself. One
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very common need is to tell Ansible to use a Python 3 interpreter on
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those hosts. This would look like::
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fully.qualified.domain ansible_python_interpreter=/usr/bin/python3
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other.machine.hostname ansible_python_interpreter=/usr/bin/python3
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Build environment
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~~~~~~~~~~~~~~~~~
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The ``scripts/ci/setup/build-environment.yml`` Ansible playbook will
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set up machines with the environment needed to perform builds and run
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QEMU tests. This playbook consists on the installation of various
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required packages (and a general package update while at it). It
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currently covers a number of different Linux distributions, but it can
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be expanded to cover other systems.
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The minimum required version of Ansible successfully tested in this
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playbook is 2.8.0 (a version check is embedded within the playbook
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itself). To run the playbook, execute::
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cd scripts/ci/setup
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ansible-playbook -i inventory build-environment.yml
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Please note that most of the tasks in the playbook require superuser
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privileges, such as those from the ``root`` account or those obtained
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by ``sudo``. If necessary, please refer to ``ansible-playbook``
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options such as ``--become``, ``--become-method``, ``--become-user``
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and ``--ask-become-pass``.
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gitlab-runner setup and registration
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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The gitlab-runner agent needs to be installed on each machine that
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will run jobs. The association between a machine and a GitLab project
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happens with a registration token. To find the registration token for
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your repository/project, navigate on GitLab's web UI to:
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* Settings (the gears-like icon at the bottom of the left hand side
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vertical toolbar), then
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* CI/CD, then
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* Runners, and click on the "Expand" button, then
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* Under "Set up a specific Runner manually", look for the value under
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"And this registration token:"
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Copy the ``scripts/ci/setup/vars.yml.template`` file to
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``scripts/ci/setup/vars.yml``. Then, set the
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``gitlab_runner_registration_token`` variable to the value obtained
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earlier.
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To run the playbook, execute::
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cd scripts/ci/setup
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ansible-playbook -i inventory gitlab-runner.yml
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Following the registration, it's necessary to configure the runner tags,
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and optionally other configurations on the GitLab UI. Navigate to:
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* Settings (the gears like icon), then
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* CI/CD, then
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* Runners, and click on the "Expand" button, then
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* "Runners activated for this project", then
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* Click on the "Edit" icon (next to the "Lock" Icon)
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Tags are very important as they are used to route specific jobs to
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specific types of runners, so it's a good idea to double check that
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the automatically created tags are consistent with the OS and
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architecture. For instance, an Ubuntu 20.04 aarch64 system should
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have tags set as::
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ubuntu_20.04,aarch64
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Because the job definition at ``.gitlab-ci.d/custom-runners.yml``
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would contain::
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ubuntu-20.04-aarch64-all:
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tags:
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- ubuntu_20.04
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- aarch64
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It's also recommended to:
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* increase the "Maximum job timeout" to something like ``2h``
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* give it a better Description
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