Update Jenkinsfile

Dockerfile

@@ -0,0 +1,8 @@
+FROM openjdk:8-jre-alpine
+
+EXPOSE 8080
+
+COPY ./target/java-maven-app-*.jar /usr/app/
+WORKDIR /usr/app
+
+CMD java -jar java-maven-app-*.jar

Jenkinsfile

@@ -1,37 +1,68 @@
+#!/usr/bin/env groovy
+
 pipeline {
     agent any
-    environment {
-        ANSIBLE_SERVER = "167.99.136.157"
+    tools {
+        maven 'Maven'
     }
     stages {
-        stage("copy files to ansible server") {
+        stage('increment version') {
             steps {
                 script {
-                    echo "copying all neccessary files to ansible control node"
-                    sshagent(['ansible-server-key']) {
-                        sh "scp -o StrictHostKeyChecking=no ansible/* root@${ANSIBLE_SERVER}:/root"
-
-                        withCredentials([sshUserPrivateKey(credentialsId: 'ec2-server-key', keyFileVariable: 'keyfile', usernameVariable: 'user')]) {
-                            sh 'scp $keyfile root@$ANSIBLE_SERVER:/root/ssh-key.pem'
+                    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("execute ansible playbook") {
+        stage('build app') {
             steps {
                 script {
-                    echo "calling ansible playbook to configure ec2 instances"
-                    def remote = [:]
-                    remote.name = "ansible-server"
-                    remote.host = ANSIBLE_SERVER
-                    remote.allowAnyHosts = true
+                    echo "building the application..."
+                    sh 'mvn clean package'
+                }
+            }
+        }
+        stage('build image') {
+            steps {
+                script {
+                    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 {
+                    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"'
 
-                    withCredentials([sshUserPrivateKey(credentialsId: 'ansible-server-key', keyFileVariable: 'keyfile', usernameVariable: 'user')]){
-                        remote.user = user
-                        remote.identityFile = keyfile
-                        sshScript remote: remote, script: "prepare-ansible-server.sh"
-                        sshCommand remote: remote, command: "ansible-playbook my-playbook.yaml"
+                        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'
                     }
                 }
             }

ansible/ansible.cfg

@@ -1,9 +0,0 @@
-[defaults]
-host_key_checking = False
-inventory = inventory_aws_ec2.yaml
-
-interpreter_python = /usr/bin/python3
-enable_plugins = aws_ec2
-
-remote_user = ec2-user
-private_key_file = ~/ssh-key.pem

ansible/inventory_aws_ec2.yaml

@@ -1,9 +0,0 @@
----
-plugin: aws_ec2
-regions: 
-  - eu-west-3
-keyed_groups:
-  - key: tags
-    prefix: tag
-  - key: instance_type
-    prefix: instance_type

ansible/my-playbook.yaml

@@ -1,29 +0,0 @@
----
-- name: Install python3, docker, docker-compose
-  hosts: all
-  become: yes
-  gather_facts: False
-  tasks:
-    - name: Install python3 and docker
-      vars:
-        ansible_python_interpreter: /usr/bin/python
-      yum:
-        name:
-          - python3
-          - docker
-        update_cache: yes
-        state: present
-    - name: Install Docker-compose
-      get_url: 
-        url: https://github.com/docker/compose/releases/download/1.27.4/docker-compose-Linux-{{lookup('pipe', 'uname -m')}}
-        dest: /usr/local/bin/docker-compose
-        mode: +x
-    - name: Start docker daemon
-      systemd:
-        name: docker
-        state: started
-    - name: Install docker python module
-      pip:
-        name: 
-          - docker
-          - docker-compose

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

@@ -22,17 +22,6 @@
                     </execution>
                 </executions>
             </plugin>
-
-            <!-- to handle any Java version mismatch, add the following configuration for maven-compiler-plugin -->
-            <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-compiler-plugin</artifactId>
-                <version>3.6.0</version>
-                <configuration>
-                    <source>1.8</source>
-                    <target>1.8</target>
-                </configuration>
-            </plugin>
         </plugins>
     </build>
 

prepare-ansible-server.sh

@@ -1,6 +0,0 @@
-#!/usr/bin/env bash
-
-apt update
-apt install ansible -y
-apt install python3-pip -y
-pip3 install boto3 botocore