Spring Boot Kubernetes

Sample project to use spring boot application in kubernetes with jkube maven plugin.

• Build application

mvn clean package

Docker image with layered architecture

For docker image with layered architecture, refer Jenkinsfile and Dockerfile directory.

• Open shell in project directory and run following command to build docker image.

docker build -f deploy/Dockerfile --build-arg VERSION=7.2.0 -t ashutoshsahoo/spring-boot-kubernetes:7.2.0 .

Kubernetes deployment

• Deploy to kubernetes

kubectl apply -f deploy/kubernetes.yml

• Check pod and service status

kubectl get po,svc

• Verify application status

curl --location --request GET 'http://localhost:31000/api/v5/hello'

• Delete Kubernetes deployment

kubectl delete -f deploy/kubernetes.yml

Kubernetes Istio service mesh deployment

This is a demonstration of running two different versions of same application and redirecting traffic based on path prefix.

Please follow the instructions here to configure istio inside docker desktop.

• Deploy app

kubectl apply -f deploy/istio

• Check application status

kubelet get all

• Verify application status

curl --location --request GET 'http://localhost/api/v5/hello'

• Run following command to put some traffic into system.

for i in $(seq 1 100); do curl -s -o /dev/null "http://localhost/api/v5/hello"; done
for i in $(seq 1 100); do curl -s -o /dev/null "http://localhost/api/v6/hello"; done

Open kiali dashboard to view application metrics.

• Delete deployment

kubectl delete -f deploy/istio

• Clean up istio configuration

Refer the documentation here to clean up.

Deploy application using jkube maven plugin

• Application deployment

mvn -Pk8s k8s:build k8s:resource k8s:deploy

• Verify application

kubectl exec -it deployments.apps/spring-boot-kubernetes -- bash
curl --location --request GET 'http://localhost:8080/api/v5/hello'

• UnDeploy application

mvn -Pk8s k8s:undeploy