https://github.com/rohankanojia/podsetoperatorinjava
Java Implementation of https://github.com/hrishin/podset-operator using Fabric8 Kubernetes Client
https://github.com/rohankanojia/podsetoperatorinjava
fabric8-kubernetes-client java kubernetes-operators
Last synced: 4 months ago
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Java Implementation of https://github.com/hrishin/podset-operator using Fabric8 Kubernetes Client
- Host: GitHub
- URL: https://github.com/rohankanojia/podsetoperatorinjava
- Owner: rohanKanojia
- License: apache-2.0
- Created: 2019-09-05T13:36:46.000Z (almost 6 years ago)
- Default Branch: master
- Last Pushed: 2024-08-13T14:32:04.000Z (11 months ago)
- Last Synced: 2025-02-09T07:07:49.671Z (5 months ago)
- Topics: fabric8-kubernetes-client, java, kubernetes-operators
- Language: Java
- Homepage: https://github.com/fabric8io/kubernetes-client
- Size: 70.3 KB
- Stars: 57
- Watchers: 4
- Forks: 26
- Open Issues: 2
-
Metadata Files:
- Readme: README.md
- License: license.txt
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README
# PodSet Operator in Java Using Fabric8 Kubernetes Client
[](https://twitter.com/fabric8io)
## Note
> This project is a demo project for blog for writing a simple Kubernetes operation in Java using [Fabric8 Kubernetes Client](https://github.com/fabric8io/kubernetes-client). You can find full blog here: [Writing a simple Kubernetes Operation in Java](https://developers.redhat.com/blog/2019/10/07/write-a-simple-kubernetes-operator-in-java-using-the-fabric8-kubernetes-client/)
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.
## How to Build
```
mvn clean install
```
## How to Run
```
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](https://github.com/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 `ServiceAccount` that would be used by the `Pod`, it's `default` in 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=: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
```
