PodSet Operator

An example of Kubernetes Operator built with the kubebuilder.

This PodSet operator takes care of scaling up and down pods that run a sleep 3600 command in a busybox image. Nothing really fancy, but the point is to:

see how the CRD and operator controller can be defined, packaged and deployed
demonstrate the logic of reconcialation when a custom resource changes, or when pods are added or removed by a user

Requirements

kubebuilder version: v2.3.1+
kubernetes: v1.14+
go version: v1.13+
docker version: 17.03+

Building and deploying

执行make install即可部署CRD到kubernetes：

make install

部署成功后，用api-versions命令可以查到该GV：

kubectl api-versions|grep data.clond

部署podset-operator集群

kubectl apply -f config/samples/data.clond_v1_podset.yaml

删除pod

kubectl apply -f config/samples/pod_delete.yaml

pod扩容

kubectl apply -f config/samples/scale_up.yaml

pod缩容

kubectl apply -f config/samples/scale_down.yaml

清理pod

kubectl delete -f config/samples/data.clond_v1_podset.yaml

pod查看

kubectl get pod

operator查看

kubectl get podset

operator的状态查看

kubectl describe podset podset-sample

operator的状态也是在controller中设置的。

Build image

make docker-build docker-push IMG=shaloudocker/podset:v1

部署

make deploy IMG=shaloudocker/podset:v1

Build Yaml

可以单独在Makefile下添加构建输出yaml的编排。

allYaml: manifests
	cd config/manager && kustomize edit set image controller=${IMG}
	kustomize build config/default >  config/manifests/all.yaml

然后执行新增的命令即可。

make allYaml IMG=shaloudocker/podset:v1

开发完成后就可以使用这个模板直接到环境上了。

Uninstall And Clean

make uninstall