challenges-k8s-crd's Introduction

1 Kubernetes CRD

Blog URL: https://kubernetes.dennyzhang.com/challenges-k8s-crd, Category: concept

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1.1 Questions

1.1.1 DONE [#A] Two ways to extend kubernetes API: crd and aggregator

https://kubernetes.io/docs/reference/using-api/api-overview/

https://github.com/kubernetes/community/blob/master/contributors/design-proposals/api-machinery/aggregated-api-servers.md

CustomResourceDefinition for basic CRUD needs.
Aggregator for a full set of Kubernetes API semantics to implement their own apiserver.

1.1.2 How to instruct controller to restart a pod/container

1.1.3 DONE resource vs sub-resource

https://github.com/kubernetes/kubernetes/blob/1b3a2dd0830ca0e02d5b95d2ecc0161d0c93a0c7/staging/src/k8s.io/apiextensions-apiserver/pkg/registry/customresource/etcd.go#L36-L41

1.1.4 [#A] Deal with controller crash issue

1.2 Scenario-101: Create a dummy CRD resource

Requirements:

1. Install and start minikube
2. Create a dummy resource
3. Create/read/update/delete this CRD

Main Tech:
See more: Scenario-101

1.3 Scenario-102: Create CRD with Subresources

Requirements:

1. Install and start minikube
2. Create a CRD

Main Tech:
See more: Scenario-102

1.4 Scenario-103: Create a CRD with a real controller

Requirements:

1. Install and start minikube
2. Create a CRD

Main Tech:
See more: Scenario-103

2 More Resources

License: Code is licensed under MIT License.

https://kubernetes.io/docs/tasks/access-kubernetes-api/custom-resources/custom-resource-definitions/
https://blog.openshift.com/kubernetes-deep-dive-code-generation-customresources/
https://github.com/kubernetes/code-generator
https://github.com/kubernetes/sample-controller

https://github.com/martin-helmich/kubernetes-crd-example
https://kubernetes.io/docs/concepts/services-networking/service/