Real Time Scenario for Multi-Stage Build - 3 Tier Architecture

multi-stage-multi-agent/Real_Used_Case_scenario/JenkinsFile

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+pipeline {
+    agent none  // Define specific agents in each stage
+
+    stages {
+        stage('Build Web Tier') {
+            agent {
+                docker {
+                    image 'openjdk:17-jdk'  // Java Docker image
+                }
+            }
+            steps {
+                echo 'Building Web Tier...'
+                // Assuming a Maven-based Java project
+                sh 'mvn clean compile'  // Compile the Java project
+                sh 'mvn package'  // Package the Java project (produces a .jar or .war file)
+            }
+        }
+
+        stage('Test Web Tier') {
+            agent {
+                docker {
+                    image 'openjdk:17-jdk'  // Java Docker image
+                }
+            }
+            steps {
+                echo 'Testing Web Tier...'
+                // Run tests using Maven
+                sh 'mvn test'  // Execute unit tests
+                sh 'mvn verify'  // Verify the results, including integration tests if any
+            }
+        }
+
+        stage('Build Application Tier') {
+            agent {
+                docker {
+                    image 'node:18'  // Node.js Docker image
+                }
+            }
+            steps {
+                echo 'Building Application Tier...'
+                // Assuming a Node.js project with npm
+                sh 'npm install'  // Install dependencies
+                sh 'npm run build'  // Build the application (if using a build tool)
+            }
+        }
+
+        stage('Test Application Tier') {
+            agent {
+                docker {
+                    image 'node:18'  // Node.js Docker image
+                }
+            }
+            steps {
+                echo 'Testing Application Tier...'
+                // Run tests using npm
+                sh 'npm test'  // Run the test suite defined in package.json
+            }
+        }
+
+        stage('Build Database Tier') {
+            agent {
+                docker {
+                    image 'mariadb:latest'  // SQL Docker image (MariaDB)
+                }
+            }
+            steps {
+                echo 'Building Database Tier...'
+                // For databases, this typically involves preparing schema or seed data
+                // Example script to initialize the database (customize as needed)
+                sh 'mysql -u root -p"$MYSQL_ROOT_PASSWORD" < init-database.sql'
+            }
+        }
+
+        stage('Test Database Tier') {
+            agent {
+                docker {
+                    image 'mariadb:latest'  // SQL Docker image (MariaDB)
+                }
+            }
+            steps {
+                echo 'Testing Database Tier...'
+                // Example script to run tests or validate database schema
+                // This could involve connecting to the database and running queries
+                sh 'mysql -u root -p"$MYSQL_ROOT_PASSWORD" < test-database.sql'
+            }
+        }
+
+        stage('Deploy Web Tier') {
+            agent {
+                docker {
+                    image 'openjdk:17-jdk'  // Java Docker image
+                }
+            }
+            steps {
+                echo 'Deploying Web Tier...'
+                // Deployment commands for the Web Tier
+                sh 'scp target/myapp.jar user@server:/path/to/deploy'  // Example SCP command
+                sh 'ssh user@server "systemctl restart myapp"'  // Example SSH command to restart the application
+            }
+        }
+
+        stage('Deploy Application Tier') {
+            agent {
+                docker {
+                    image 'node:18'  // Node.js Docker image
+                }
+            }
+            steps {
+                echo 'Deploying Application Tier...'
+                // Deployment commands for the Application Tier
+                sh 'scp -r dist/* user@server:/path/to/deploy'  // Example SCP command
+                sh 'ssh user@server "pm2 restart myapp"'  // Example SSH command to restart the Node.js application
+            }
+        }
+
+        stage('Deploy Database Tier') {
+            agent {
+                docker {
+                    image 'mariadb:latest'  // SQL Docker image (MariaDB)
+                }
+            }
+            steps {
+                echo 'Deploying Database Tier...'
+                // Database deployment commands (e.g., applying schema changes)
+                sh 'mysql -u root -p"$MYSQL_ROOT_PASSWORD" < deploy-database.sql'
+            }
+        }
+    }
+
+    post {
+        always {
+            echo 'Cleaning up...'
+            // Cleanup steps, if necessary
+            // For example, remove temporary files or notify stakeholders
+        }
+    }
+}

multi-stage-multi-agent/Real_Used_Case_scenario/README.md

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+Real Time Used Case Detailed Steps Explained:
+
+**Web Tier (Java)**
+
+**Build**:
+mvn clean compile: Cleans and compiles the Java project.
+mvn package: Packages the compiled code into a .jar or .war file.
+**Test**:
+mvn test: Runs unit tests.
+mvn verify: Runs integration tests and verifies the results.
+
+
+**Application Tier (Node.js)**
+
+**Build**:
+npm install: Installs dependencies defined in package.json.
+npm run build: Builds the application if a build step is defined (e.g., for a React app).
+**Test**:
+npm test: Runs the tests defined in package.json.
+
+**Database Tier (SQL)**
+
+**Build**:
+mysql -u root -p"$MYSQL_ROOT_PASSWORD" < init-database.sql: Initializes the database with schema and seed data.
+**Test**:
+mysql -u root -p"$MYSQL_ROOT_PASSWORD" < test-database.sql: Runs tests or validations on the database.
+Deploy Stages
+
+**Web Tier**:
+Uses scp to copy the JAR file to the deployment server and ssh to restart the application service.
+
+**Application Tie**r:
+Uses scp to copy built files to the deployment server and ssh to restart the Node.js application using pm2.
+
+**Database Tier**:
+Uses mysql to apply any database changes or schema updates.
+
+**Customization**:
+
+**Scripts and Commands**: Ensure the scripts (e.g., build-web.sh, test-web.sh) and deployment commands are adapted to fit your actual build and deployment processes.
+
+**Credentials**: Securely manage credentials (e.g., database passwords) using Jenkins credentials management rather than hard-coding them in scripts.
+
+This pipeline setup should give you a comprehensive framework to manage builds, tests, and deployments across different tiers of your application using Docker containers for isolated and consistent environments.