Update Jenkinsfile

.gitignore

@@ -1,2 +1 @@
 .idea/*
-target

Dockerfile

@@ -2,7 +2,7 @@ FROM openjdk:8-jre-alpine
 
 EXPOSE 8080
 
-COPY ./target/java-maven-app-1.0-SNAPSHOT.jar /usr/app/
+COPY ./target/java-maven-app-*.jar /usr/app/
 WORKDIR /usr/app
 
-ENTRYPOINT ["java", "-jar", "java-maven-app-1.0-SNAPSHOT.jar"]
+CMD java -jar java-maven-app-*.jar

Jenkinsfile

@@ -1,51 +1,68 @@
 #!/usr/bin/env groovy
 
-library identifier: 'jenkins-shared-library@master', retriever: modernSCM(
-    [$class: 'GitSCMSource',
-     remote: 'https://gitlab.com/nanuchi/jenkins-shared-library.git',
-     credentialsId: 'gitlab-credentials'
-    ]
-)
-
 pipeline {
     agent any
     tools {
         maven 'Maven'
     }
-    environment {
-        IMAGE_NAME = 'nanajanashia/demo-app:java-maven-2.0'
-    }
     stages {
+        stage('increment version') {
+            steps {
+                script {
+                    echo 'incrementing app version...'
+                    sh 'mvn build-helper:parse-version versions:set \
+                        -DnewVersion=\\\${parsedVersion.majorVersion}.\\\${parsedVersion.minorVersion}.\\\${parsedVersion.nextIncrementalVersion} \
+                        versions:commit'
+                    def matcher = readFile('pom.xml') =~ '<version>(.+)</version>'
+                    def version = matcher[0][1]
+                    env.IMAGE_NAME = "$version-$BUILD_NUMBER"
+                }
+            }
+        }
         stage('build app') {
             steps {
                 script {
-                  echo 'building application jar...'
-                  buildJar()
+                    echo "building the application..."
+                    sh 'mvn clean package'
                 }
             }
         }
         stage('build image') {
             steps {
                 script {
-                   echo 'building docker image...'
-                   buildImage(env.IMAGE_NAME)
-                   dockerLogin()
-                   dockerPush(env.IMAGE_NAME)
+                    echo "building the docker image..."
+                    withCredentials([usernamePassword(credentialsId: 'docker-hub', passwordVariable: 'PASS', usernameVariable: 'USER')]) {
+                        sh "docker build -t nanajanashia/demo-app:${IMAGE_NAME} ."
+                        sh "echo $PASS | docker login -u $USER --password-stdin"
+                        sh "docker push nanajanashia/demo-app:${IMAGE_NAME}"
+                    }
                 }
             }
         }
         stage('deploy') {
             steps {
                 script {
-                   echo 'deploying docker image to EC2...'
+                    withKubeConfig([credentialsId: 'k8s-credentials', serverUrl: 'https://7293fae4-4c9d-4629-bc82-262d0a2b8e3c.eu-central-2.linodelke.net']) {
+                        withCredentials([usernamePassword(credentialsId: 'docker-hub', passwordVariable: 'PASS', usernameVariable: 'USER')]) {
+                            sh "kubectl create secret docker-registry my-registry-key --docker-server=docker.io --docker-username=$USER --docker-password=$PASS"
+                        }
+                        sh 'envsubst < kubernetes/deployment.yaml | kubectl apply -f -'
+                    }
+                }
+            }
+        }
+        stage('commit version update') {
+            steps {
+                script {
+                    withCredentials([usernamePassword(credentialsId: 'gitlab-credentials', passwordVariable: 'PASS', usernameVariable: 'USER')]) {
+                        // git config here for the first time run
+                        sh 'git config --global user.email "jenkins@example.com"'
+                        sh 'git config --global user.name "jenkins"'
 
-                   def shellCmd = "bash ./server-cmds.sh ${IMAGE_NAME}"
-                   def ec2Instance = "ec2-user@35.180.251.121"
-
-                   sshagent(['ec2-server-key']) {
-                       sh "scp -o StrictHostKeyChecking=no server-cmds.sh ${ec2Instance}:/home/ec2-user"
-                       sh "scp -o StrictHostKeyChecking=no docker-compose.yaml ${ec2Instance}:/home/ec2-user"
-                       sh "ssh -o StrictHostKeyChecking=no ${ec2Instance} ${shellCmd}"
+                        sh "git remote set-url origin https://${USER}:${PASS}@gitlab.com/nanuchi/java-maven-app.git"
+                        sh 'git add .'
+                        sh 'git commit -m "ci: version bump"'
+                        sh 'git push origin HEAD:jenkins-jobs'
                     }
                 }
             }

docker-compose.yaml

@@ -1,12 +0,0 @@
-version: '3.8'
-services:
-    java-maven-app:
-      image: ${IMAGE}
-      ports:
-        - 8080:8080
-    postgres:
-      image: postgres:13
-      ports:
-        - 5432:5432
-      environment:
-        - POSTGRES_PASSWORD=my-pwd

kubernetes/deployment.yaml

@@ -0,0 +1,25 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: java-maven-app
+  labels:
+    app: java-maven-app
+spec:
+  replicas: 2
+  selector:
+    matchLabels:
+      app: java-maven-app
+  template:
+    metadata:
+      labels:
+        app: java-maven-app
+    spec:
+      imagePullSecrets:
+        - name: my-registry-key
+      containers:
+      - name: java-maven-app
+        image: nanajanashia/demo-app:$IMAGE_NAME
+        imagePullPolicy: Always
+        ports:
+        - containerPort: 8080
+

kubernetes/service.yaml

@@ -0,0 +1,11 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: java-maven-app
+spec:
+  selector:
+    app: java-maven-app
+  ports:
+    - protocol: TCP
+      port: 80
+      targetPort: 8080

pom.xml

@@ -6,7 +6,7 @@
 
     <groupId>com.example</groupId>
     <artifactId>java-maven-app</artifactId>
-    <version>1.0-SNAPSHOT</version>
+    <version>1.1.0-SNAPSHOT</version>
 
     <build>
         <plugins>
@@ -24,11 +24,7 @@
             </plugin>
         </plugins>
     </build>
-    <properties>
-        <java.version>1.8</java.version>
-        <maven.compiler.source>1.8</maven.compiler.source>
-        <maven.compiler.target>1.8</maven.compiler.target>
-    </properties>
+
     <dependencies>
         <dependency>
             <groupId>org.springframework.boot</groupId>

script.groovy

@@ -0,0 +1,19 @@
+def buildJar() {
+    echo "building the application..."
+    sh 'mvn package'
+} 
+
+def buildImage() {
+    echo "building the docker image..."
+    withCredentials([usernamePassword(credentialsId: 'docker-hub-repo', passwordVariable: 'PASS', usernameVariable: 'USER')]) {
+        sh 'docker build -t nanajanashia/demo-app:jma-2.0 .'
+        sh "echo $PASS | docker login -u $USER --password-stdin"
+        sh 'docker push nanajanashia/demo-app:jma-2.0'
+    }
+} 
+
+def deployApp() {
+    echo 'deploying the application...'
+} 
+
+return this

server-cmds.sh

@@ -1,5 +0,0 @@
-#!/usr/bin/env bash
-
-export IMAGE=$1
-docker-compose -f docker-compose.yaml up --detach
-echo "success"

src/main/resources/static/index.html

@@ -1,11 +0,0 @@
-<!DOCTYPE html>
-<html lang="en">
-<head>
-    <meta charset="UTF-8">
-    <title>MyApp</title>
-</head>
-<body>
-<h1>Welcome to Java Maven Application</h1>
-<!-- add image here  <img src="" width="" /> -->
-</body>
-</html>

src/test/java/AppTest.java

@@ -1,16 +0,0 @@
-import com.example.Application;
-import org.junit.Test;
-import static org.junit.Assert.*;
-
-public class AppTest {
-
-    @Test
-    public void testApp() {
-        Application myApp = new Application();
-
-        String result = myApp.getStatus();
-
-        assertEquals("OK", result);
-    }
-
-}