This project is followed by the medium post Kubernetes Dummy Operator in Java. Go check it out for a more detailed intro and to see a demonstration.
- manage the custom resources
- create deployments with custom resource information (using the busybox image for the pods)
- inside the pods launched by the deployment run the command "/bin/sh -c /bin/echo "$quote\n$extra"; /bin/sleep $sleep".
You can check if the operator is up by checking its health with the command
http://localhost:8080/dummy/healthAt the moment if fetches all Custom Resource Definitions and looks for the Dummy one. If it does not find it it reports as down.
Before launching you need kubernetes up and running and it also needs to have the Dummy custom resource (which you can create by doing "kubectl apply -f yaml/dummycrd.yaml"). Afterwards, you can launch it by executing "mvn spring-boot:run"
Another alternative to launch is by building a docker image with the command
mvn spring-boot:build-image
# or using the Dockerfile and running the command -> docker build -t operator:0.0.1-SNAPSHOT --build-arg VERSION=0.0.1-SNAPSHOT .And then launch a pod with that image
kubectl run myoperator -it --rm --image=operator:0.0.1-SNAPSHOTIf you generate the image you can also launch the operator by creating the objects in the file
myoperator.yaml which will create a deployment and a service with NodePort. If you use the file as is you will need to create the objects in the setup.yaml file as well. Beware that if you are using minikube you might need to set it to use local docker images.
If you initiated the pod with myoperator.yaml file you can reach it by using the command
curl -s 127.0.0.1:$(kubectl get svc myoperator -o jsonpath='{.spec.ports[].nodePort}')/dummy/info | jq .note: the jq executable is just to make it look prettier and as far as I know it is not installed by default