y0zg/client-go-examples

Collection of mini-programs demonstrating Kubernetes client-go usage.

Kubernetes client-go examples

A collection of mini-programs covering various client-go use cases inspired by client-go/examples. The intention (at least so far) is to test (more or less) fresh version of Go and packages against a few latest Kubernetes versions.

What tested at the moment:

• go 1.17
• k8s.io/client-go v0.23.1
• Kubernetes v1.22.3

Setup

Most examples expect minikube with at least two Kubernetes clusters - shared1 and shared2.

curl -sLS https://get.arkade.dev | sudo sh
arkade get minikube kubectl

minikube start --profile shared1
minikube start --profile shared2

Run

Oversimplified (for now):

cd <program>
go run main.go

TODO

• Add more assertions to mini-programs
• Test different Kubernetes versions
• Setup GitHub action(s)
• Examples to be covered
  • setting API request timeout
  • configuring API request throttling
  • delete
  • delete collection
  • list filtration
  • watch filtration
  • informer filtration
  • patch with different strategies
  • Server Side Apply (SSA)
  • working with subresources
  • ownerReference (one and many)
  • optimistic locking and retry.RetryOnConflict
  • https://stackoverflow.com/questions/56115197/how-to-idiomatically-fill-empty-fields-with-default-values-for-kubernetes-api-ob

Contribution

Contributions are always welcome! Want to participate but don't know where to start? The TODO list above could give you some ideas. Before jumping to the code, please create an issue describing the addition/change first. This will allow me to coordinate the effort and make sure multiple people don't work on the same task.