Spring-Boot-K8s-App

Run spring boot application and mysql on kubernetes cluster

Prerequisite

• Docker and kubernetes cluster
• Local registry (setup guide)
• Configuring insecure registry on each node (see this)
• kubectl
• Jdk 1.8
• Maven 3.x

Setup application

Replace your registry node ip

Download or clone the project, Use your registry node ip to replace 192.168.6.128 in deploy/spring-boot-deployment.yaml and deploy/auto-deploy.sh. then cd to the project's root directory

Create mysql secret to store database configuration

Note: my root password for mysql is mysql520 and database user to connect spring application is root, all values in the deploy/mysql-secret.yaml are required to be base64 encoded, you can print base64 encode values easily from the terminal

echo "mysql520" | base64
bXlzcWw1MjAK
echo "root" | base64
cm9vdAo=

create mysql secret

kubectl apply -f deploy/mysql-secret.yaml

Start mysql database

kubectl apply -f deploy/mysql-pv.yaml
kubectl apply -f deploy/mysql-deployment.yaml

Start spring boot application

sh deploy/auto-deploy.sh

Application started

All pods are running

[root@k8s-master Desktop]# kubectl get pods -o wide
NAME                                             READY   STATUS    RESTARTS   AGE    IP            NODE        NOMINATED NODE   READINESS GATES
mysql-788465ddd-blq6z                            1/1     Running   0          108s   10.244.1.33   k8s-node1   <none>           <none>
spring-boot-k8s-app-deployment-bf6b8d8b4-xkcgb   1/1     Running   0          11m    10.244.2.25   k8s-node2   <none>           <none>

Test your application

Get all nodes ip

[root@k8s-master Desktop]# kubectl get nodes -o wide
NAME         STATUS   ROLES    AGE   VERSION   INTERNAL-IP     EXTERNAL-IP   OS-IMAGE                KERNEL-VERSION               CONTAINER-RUNTIME
k8s-master   Ready    master   45h   v1.19.0   192.168.6.128   <none>        CentOS Linux 7 (Core)   3.10.0-957.12.2.el7.x86_64   docker://18.6.1
k8s-node1    Ready    <none>   44h   v1.19.0   192.168.6.131   <none>        CentOS Linux 7 (Core)   3.10.0-957.12.2.el7.x86_64   docker://18.6.1
k8s-node2    Ready    <none>   44h   v1.19.0   192.168.6.132   <none>        CentOS Linux 7 (Core)   3.10.0-957.12.2.el7.x86_64   docker://18.6.1

Test your api by http://{NodeIp}:{NodePort}, normally you will be able to access the api by using any of the nodes ip

[root@k8s-master Desktop]# curl http://192.168.6.132:32082
SpringBoot K8s Application
[root@k8s-master Desktop]# curl http://192.168.6.131:32082
SpringBoot K8s Application

[root@k8s-master Desktop]# curl http://192.168.6.132:32082/students
[{"id":1,"name":"Andrew","age":22,"gender":"1","parent":"Sony","birth":"1998-06-23"},{"id":2,"name":"Tom","age":21,"gender":"0","parent":"Jackie","birth":"1999-01-23"},{"id":3,"name":"Johnson","age":20,"gender":"1","parent":"Mickey","birth":"1920-11-23"}]

Uninstall application

kubectl delete -f deploy/mysql-deployment.yaml
kubectl delete -f deploy/mysql-secret.yaml
kubectl delete -f deploy/mysql-pv.yaml
kubectl delete -f deploy/spring-boot-deployment.yaml