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Use Gradle build tool
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‎.gitignore‎

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HELP.md
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.gradle
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build/
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target/
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!gradle/wrapper/gradle-wrapper.jar
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!**/src/main/**/build/
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!**/src/test/**/build/
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### VS Code ###
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.vscode/
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# project- specific
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.tempo-data/

‎Dockerfile‎

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FROM openjdk:17-slim as builder
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WORKDIR /usr/local/temp
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ARG JAR_FILE=build/libs/*.jar
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ADD ${JAR_FILE} application.jar
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RUN java -Djarmode=layertools -jar application.jar extract
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FROM openjdk:17-slim
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ARG VERSION=latest
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LABEL version=${VERSION}
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LABEL maintainer="Ashutosh Sahoo"
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LABEL description="spring-boot-kubernetes-mysql"
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WORKDIR /usr/local/app
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RUN useradd --user-group --system --create-home --no-log-init app
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USER app
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COPY --from=builder /usr/local/temp/dependencies/ ./
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COPY --from=builder /usr/local/temp/spring-boot-loader/ ./
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COPY --from=builder /usr/local/temp/snapshot-dependencies/ ./
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COPY --from=builder /usr/local/temp/application/ ./
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ENTRYPOINT ["java","org.springframework.boot.loader.JarLauncher"]

‎README.md‎

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# Spring Boot Kubernetes and MySQL
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Sample project to test and deploy spring boot application with mysql database in kubernetes using JKube maven plugin.
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Sample project to test and deploy spring boot application with mysql database in kubernetes.
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## Prerequisite
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- Docker with kubernetes enabled
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- Kubernetes command-line tool(kubectl)
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- JDK 17 LTS
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- Maven
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- Gradle
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## Start application
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- Create secrets and start mysql database
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```sh
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kubectl create -f deployment/secrets.yaml
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kubectl create -f deployment/mysql-deployment.yaml
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kubectl apply -f deployment/secrets.yaml
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kubectl apply -f deployment/mysql-deployment.yaml
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```
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- Build application and deploy in kubernetes
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```sh
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mvn clean package
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mvn k8s:build k8s:resource k8s:apply
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gradle clean dockerTag
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kubectl apply -f deployment/app-k8s.yaml
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```
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- Test application :
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http://localhost:31371/api/v1/pets \
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-H 'Accept: application/json' \
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-H 'Content-Type: application/json'
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```
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Response should be :
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### Delete deployment, service, secret and pvc
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```sh
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mvn k8s:undeploy
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kubectl delete -f deployment/app-k8s.yaml
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kubectl delete -f deployment/mysql-deployment.yaml
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kubectl delete -f deployment/secrets.yaml
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```
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### Reference
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- [Spring Boot](https://spring.io/projects/spring-boot)
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- [Eclipse JKube](https://github.com/eclipse/jkube)
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- [Gradle Docker image build plugin](https://plugins.gradle.org/plugin/com.palantir.docker)
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- [OpenJDK Docker](https://hub.docker.com/_/openjdk)
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- [MySQL Docker](https://hub.docker.com/_/mysql)

‎build.gradle‎

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plugins {
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id 'java'
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id 'org.springframework.boot' version '3.0.5'
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id 'io.spring.dependency-management' version '1.1.0'
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id 'idea'
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id 'com.palantir.docker' version '0.35.0'
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}
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group 'com.ashu.practice'
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version '5.0.0'
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sourceCompatibility = '17'
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repositories {
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mavenCentral()
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}
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configurations {
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compileOnly {
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extendsFrom annotationProcessor
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}
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}
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dependencies {
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implementation 'org.springframework.boot:spring-boot-starter-actuator'
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implementation 'org.springframework.boot:spring-boot-starter-web'
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implementation 'org.springframework.boot:spring-boot-starter-data-jpa'
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runtimeOnly 'com.mysql:mysql-connector-j'
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compileOnly 'org.projectlombok:lombok'
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annotationProcessor 'org.springframework.boot:spring-boot-configuration-processor'
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annotationProcessor 'org.projectlombok:lombok'
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testImplementation 'org.springframework.boot:spring-boot-starter-test'
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testImplementation 'com.h2database:h2'
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}
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tasks.named('test') {
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useJUnitPlatform()
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}
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jar {
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enabled = false
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}
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docker {
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dependsOn bootJar
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name "ashutoshsahoo/${project.name}:latest"
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buildArgs([JAR_FILE: "${project.name}-${project.version}.jar", VERSION: "${project.version}"])
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files bootJar
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// tag 'latest', "${project.parent.version}"
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// noCache true
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}
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idea {
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module {
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downloadJavadoc = true
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downloadSources = true
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}
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}

‎deployment/Jenkinsfile‎

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‎deployment/app-k8s.yaml‎

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---
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apiVersion: v1
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kind: List
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items:
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- apiVersion: v1
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kind: Service
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metadata:
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labels:
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app: spring-boot-kubernetes-mysql
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version: 5.0.0
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name: spring-boot-kubernetes-mysql
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spec:
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ports:
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- name: http
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port: 8080
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protocol: TCP
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targetPort: 8080
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nodePort: 31371
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type: NodePort
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selector:
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app: spring-boot-kubernetes-mysql
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- apiVersion: apps/v1
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kind: Deployment
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metadata:
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labels:
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app: spring-boot-kubernetes-mysql
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version: 5.0.0
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name: spring-boot-kubernetes-mysql
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spec:
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selector:
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matchLabels:
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app: spring-boot-kubernetes-mysql
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template:
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metadata:
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labels:
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app: spring-boot-kubernetes-mysql
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version: 5.0.0
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spec:
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containers:
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- name: spring-boot-kubernetes-mysql
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image: ashutoshsahoo/spring-boot-kubernetes-mysql:5.0.0
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imagePullPolicy: IfNotPresent
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resources:
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limits:
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memory: "1Gi"
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cpu: "1"
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requests:
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memory: "100Mi"
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cpu: "100m"
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ports:
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- containerPort: 8080
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name: http
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protocol: TCP
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env:
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- name: SPRING_PROFILES_ACTIVE
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value: k8s
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- name: SPRING_DATASOURCE_URL
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valueFrom:
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configMapKeyRef:
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name: mysql-config
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key: MYSQL_DATABASE_URL
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- name: SPRING_DATASOURCE_USERNAME
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valueFrom:
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secretKeyRef:
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name: mysql-secret
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key: MYSQL_USER
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- name: SPRING_DATASOURCE_PASSWORD
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valueFrom:
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secretKeyRef:
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name: mysql-secret
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key: MYSQL_PASSWORD

‎pom.xml‎

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‎settings.gradle‎

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rootProject.name = 'spring-boot-kubernetes-mysql'

‎src/main/jkube/deployment.yaml‎

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‎src/main/jkube/service.yaml‎

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