Springboot as service in kubernate (k8s)

Configure kubernate

System required: https://www.docker.com/products/docker-desktop

Enable k8s in the docker-desktop

Build application

To push image into your docker-registry (docker-hub), edit the pom.xml to replace with yours: yourname/springboot-k8s-example

mvn clean package dockerfile:build

Create deployment springboot into k8s

kubectl run springboot-k8s-example --image=yourname/springboot-k8s-example:0.0.1-SNAPSHOT --port=8080

Alternatively, create a deployment.yaml and apply it

kubectl create deployment springboot-k8s-example --image=yourname/springboot-k8s-example:0.0.1-SNAPSHOT --dry-run -o yaml > deployment.yaml

deployment.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    app: springboot-k8s-example
  name: springboot-k8s-example
spec:
  replicas: 2
  selector:
    matchLabels:
      app: springboot-k8s-example
  strategy: {}
  template:
    metadata:
      labels:
        app: springboot-k8s-example
    spec:
      containers:
      - image: douster/springboot-k8s-example:0.0.2-SNAPSHOT
        name: springboot-k8s-example
        resources: {}
status: {}

kubectl apply -f deployment.yaml

kubectl get deployments

NAME                     READY   UP-TO-DATE   AVAILABLE   AGE
springboot-k8s-example   0/1     1            0           41s

Expose port

expose the service

kubectl expose deployment springboot-k8s-example \
--type=LoadBalancer \
--name=springboot-k8s-service-example \
--port=8080 \
--target-port=8080

Alternatively, create a service.yaml

apiVersion: v1
kind: Service
metadata:
  labels:
    visualize: "true"
  name: springboot-k8s-service-example
spec:
  selector:
    app: springboot-k8s-example
  ports:
  - name: http
    protocol: TCP
    port: 8080
    targetPort: 8080
  type: LoadBalancer

kubectl apply -f service.yaml

get services

kubectl get services

curl http://localhost:8080/api/hello