add kubectl deploy stage

Jenkinsfile

@@ -40,9 +40,16 @@ pipeline {
             }
         }
         stage('deploy') {
+            environment {
+                AWS_ACCESS_KEY_ID = credentials('jenkins_aws_access_key_id')
+                AWS_SECRET_ACCESS_KEY = credentials('jenkins-aws_secret_access_key')
+                APP_NAME = 'java-maven-app'
+            }
             steps {
                 script {
-                   echo 'deploying docker image to EC2...'
+                    echo 'deploying docker image...'
+                    sh 'envsubst < kubernetes/deployment.yaml | kubectl apply -f -'
+                    sh 'envsubst < kubernetes/service.yaml | kubectl apply -f -'
                 }
             }
         }

kubernetes/deployment.yaml

@@ -0,0 +1,24 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: $APP_NAME
+  labels:
+    app: $APP_NAME
+spec:
+  replicas: 2
+  selector:
+    matchLabels:
+      app: $APP_NAME
+  template:
+    metadata:
+      labels:
+        app: $APP_NAME
+    spec:
+      imagePullSecrets:
+        - name: my-registry-key
+      containers:
+        - name: $APP_NAME
+          image: nanajanashia/demo-app:$IMAGE_NAME
+          imagePullPolicy: Always
+          ports:
+            - containerPort: 8080

kubernetes/service.yaml

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