DevOps Intern Tasks

Dockerfile

@@ -1,19 +1,20 @@
-FROM node:24-alpine
+# Used stable version-LTS
+FROM node:20-alpine
 
-# Create app user and group
-RUN addgroup app && adduser -S -G app app
+# Set working directory inside container
+WORKDIR /app
 
-WORKDIR /usr/src/app
-
-# Copy package files and install dependencies as root
+# Copy package files first
 COPY package*.json ./
-RUN npm ci --omit=dev
 
-# Copy rest of the app
-COPY . .
+# Install dependencies-into image
+RUN npm install
 
-# Switch to non-root user for runtime
-USER app
+# Copy remaining files
+COPY . .
 
+# Expose application port inside container
 EXPOSE 3000
-CMD ["node", "app.js"]
+# Start the script inside package.json-when container runs
+CMD ["npm", "start"]
+

Jenkinsfile

@@ -0,0 +1,53 @@
+    pipeline {
+        agent any     // In this case windows local
+
+    environment {                     // for reusability and clean code 
+        IMAGE_NAME = "my-node-app2"
+        CONTAINER_NAME = "node-app-container2"
+        PORT = "3000"
+    }
+
+    stages {              // contains all phases of CI-CD pipeline
+
+        stage('Pull Code') {     
+            steps {  
+                git(                        // provided by git plugins 
+                branch: 'dev',
+                url: 'https://github.com/harshitmishra25/sample-node-project'
+                )
+            }   
+        }
+
+        stage('Build Docker Image') {
+            steps {                                    // image
+                bat 'docker build -t %IMAGE_NAME% .' 
+            }
+        }
+
+        stage('Stop & Remove Old Container') {   
+            steps {
+                bat ''' 
+                   docker stop %CONTAINER_NAME% || exit 0
+                   docker rm %CONTAINER_NAME% || exit 0
+                '''
+            }
+        }
+
+        stage('Run Docker Container') {
+            steps {                              // container
+                bat '''
+                    docker run -d -p %PORT%:%PORT% --name %CONTAINER_NAME% %IMAGE_NAME%  
+                '''
+            }
+        }
+    }
+
+    post {                             // runs after pipeline finishes(success/failure)
+        success {
+            echo "Pipeline completed successfully"
+        }
+        failure {
+            echo "Pipeline failed"
+        }
+    }
+}