[section_request] Testing Kubernetes with Molecule, Kind, and Ansible

[geerlingguy]

I was just thinking, I don't have a dedicated chapter to testing Kubernetes infrastructure configurations, but that's one thing that's actually easier to do with Molecule + Ansible than (IMO) with most other solutions, especially in CI. I already have things working in GitHub Actions and Travis CI, so I could do a chapter that introduces:

• Using Kind to create a lightweight Kubernetes environment locally or in CI.
• Using Molecule to test Ansible playbooks and roles.
• Using Molecule to create a Kind cluster and test k8s resources on it with Ansible (similar to how I use it for this book's playbooks in some cases, and for tower-operator and other K8s projects).
• Using Molecule in GitHub Actions (and/or Travis CI) to run tests using CI for your project.

[geerlingguy]

The Molecule setup in the official Ansible Kubernetes Collection is also a pretty good / thorough example: https://github.com/ansible-collections/kubernetes/blob/master/.github/workflows/ci.yml#L64-L95 (the book example would be a bit more lightweight than that, though—that molecule playbook is testing a heck of a lot that we probably wouldn't need to test).

[geerlingguy]

Did some initial work on this tonight. My plan is to build a playbook which deploys some sort of application into Kubernetes (something simple for now, since the point is to show how Molecule + Kind work together, mainly) and have it work with maybe both Kind and also either a regular cluster (with delegated driver and managed: false), or a Minikube cluster (similar to the Kind configuration?).