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Add docs about CI setup (#6397)

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Maxime Guyot
2020-08-20 13:37:23 +02:00
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# CI Setup
## Pipeline
1. unit-tests: fast jobs for fast feedback (linting, etc...)
2. deploy-part1: small number of jobs to test if the PR works with default settings
3. deploy-part2: slow jobs testing different platforms, OS, settings, CNI, etc...
4. deploy-part3: very slow jobs (upgrades, etc...)
## Runners
Kubespray has 3 types of GitLab runners:
- packet runners: used for E2E jobs (usually long)
- light runners: used for short lived jobs
- auto scaling runners: used for on-demand resources, see [GitLab docs](https://docs.gitlab.com/runner/configuration/autoscale.html) for more info
## Vagrant
Vagrant jobs are using the [quay.io/kubespray/vagrant](/test-infra/vagrant-docker/Dockerfile) docker image with `/var/run/libvirt/libvirt-sock` exposed from the host, allowing the container to boot VMs on the host.