OpenStack Infra team developed some tools like zuul, nodepool to support OpenStack upstream CI/CD. Also, we implemented our own DevOps platform based on zuulv3 for OpenStack and none-OpenStack projects on Kubernetes to support EasyStack production delivery. We enhanced the DevOps platform to make it work better in Kubernetes, for example, implementing the nodepool k8s driver to fully leverage Kubernetes ability.

The whole architecture is:

Zuul monitors the code commit and code merge for gerrit
Zuul sends node request to get a k8s pod and execute ansible jobs on it
CI job install a new OpenStack environment with helm and run tempest/rally testing
CD job upgrade the existing OpenStack environment with new chart and image

We build this architecture in 3 stages.

Adopt zuulv3 and nodepool, refine jobs and configuration to make it to support CI/CD process
Implement kubernetes driver for nodepool
Make zuul and nodepool to execute as container in kubernetes

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