pathcl / 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

All 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
  • workqueue - controllers' fundamentals
  • https://stackoverflow.com/questions/56115197/how-to-idiomatically-fill-empty-fields-with-default-values-for-kubernetes-api-ob