This project is a demo project for blog for writing a simple Kubernetes operation in Java using Fabric8 Kubernetes Client. You can find full blog here: Writing a simple Kubernetes Operation in Java
This is a demo operator which implements a simple operator for a custom resource called PodSet which is somewhat equal to ReplicaSet. Here is what this resource looks like:
apiVersion: demo.fabric8.io/v1alpha1
kind: PodSet
metadata:
name: example-podset
spec:
replicas: 5
Each PodSet object would have 'x' number of replicas, so this operator just tries to maintain x number of replicas checking whether that number of pods are running in cluster or not.
mvn clean install
mvn exec:java -Dexec.mainClass=io.fabric8.podset.operator.PodSetOperatorMain
Make Sure that PodSet Custom Resource Definition is already applied onto the cluster. If not, just apply it using this command:
kubectl apply -f src/main/resources/crd.yaml
Once everything is set, you can see that operator creating pods in your cluster for PodSet resource:
Deploying onto Kubernetes(minikube) using Eclipse JKube
- Make Sure that PodSet Custom Resource Definition is already applied onto the cluster. If not, just apply it using this command:
kubectl apply -f src/main/resources/crd.yaml
- Make sure that you have given correct privileges to
ServiceAccountthat would be used by thePod, it'sdefaultin our case. Otherwise you might get 403 from Kubernetes API server.
kubectl create clusterrolebinding default-pod --clusterrole cluster-admin --serviceaccount=default:default
# In case of some other namespace:
kubectl create clusterrolebinding default-pod --clusterrole cluster-admin --serviceaccount=<namespace>:default
- Build Docker Image
mvn k8s:build
- Generate Kubernetes Manifests
mvn k8s:resource
- Apply generated Kubernetes Manifests onto Kubernetes
mvn k8s:apply
Once generated resources are applied, try creating one of PodSet objects in src/main/resources
kubectl apply -f src/main/resources/cr.yaml
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