imagepull-controller-workshop

imagepull-controller-workshop

Agenda

Introduction

• Explain the problem to solve.
  • https://github.com/titansoft-pte-ltd/imagepullsecret-patcher
  • https://github.com/titansoft-pte-ltd/imagepullsecret-patcher/blob/master/main.go#L110
  • https://medium.com/titansoft-engineering/kubernetes-cluster-wide-access-to-private-container-registry-with-imagepullsecret-patcher-b8b8fb79f7e5
• Explain controller components (1, 2).
  • ListerWatcher
  • Handler
  • Queue (ID and cache) and workers.
  • Optimizations made on the Listers.

Implementation

• What is Kooper and alternatives.
  • client-go.
  • Kubebuilder.
  • Operator framework.
• Explain project structure.
• Implement Retriever.
• Implement Handler.
• Test with local cluster using kind.

Optional homework

• Metrics.
• Unit testing.
• Secret.
  • Caching.
  • Update on change (Secret controller).
• Service account.
  • Update on change instead of ensuring.

Further information

• Explain garbage collection (not required implementation).
  • Owner reference.
  • Finalizers.
• Creating an Operator.
  • Create CRDs with clients.
• Production ready operator example (Bilrost).