Tomcat Setup

1. Download Tomcat:

    wget https://dlcdn.apache.org/tomcat/tomcat-9/v9.0.83/bin/apache-tomcat-9.0.83.tar.gz
   

2. Extract Tomcat:

    tar -zxvf apache-tomcat-9.0.83.tar.gz
   

3. Configure tomcat-users.xml:

    <role rolename="manager-gui"/>
    <role rolename="manager-script"/>
    <user username="tomcat" password="12345" roles="manager-gui, manager-script"/>
   

4. Modify context.xml:

    vim apache-tomcat-9.0.83/webapps/manager/META-INF/context.xml
    # Delete lines 21 and 22
   

5. Start Tomcat:

    sh apache-tomcat-9.0.83/bin/startup.sh
   

6. Access Tomcat on the public IP: http://<public-ip>:8080

7. Change tomcat server port

   vim /root/apache-tomcat-9.0.80/conf/server.xml

   sh /root/apache-tomcat-9.0.80/bin/startup.sh

   sh /root/apache-tomcat-9.0.80/bin/shutdown.sh

Jenkins Integration with Tomcat

1. In Jenkins, go to Dashboard > Manage Jenkins > Credentials > System > Global credentials (unrestricted).

2. Add credentials for Tomcat (username and password).

3. Download Jenkins Tomcat Plugin:

   • Dashboard > Manage Jenkins > Manage Plugins > Available > Search for "Deploy to container" > Install.

4. Configure Jenkins Job:

pipeline {
    agent {
        label 'slave1'
    }

    stages {
        stage('checkout') {
            steps {
                git 'https://github.com/devopsbyraham/jenkins-java-project.git'
            }
        }
        stage('build') {
            steps {
                sh 'mvn compile'
            }
        }
        stage('test') {
            steps {
                sh 'mvn test'
            }
        }
        stage('code quality') {
            steps {
                sh '''
                   mvn sonar:sonar \
                     -Dsonar.projectKey=project-netflix \
                     -Dsonar.host.url=http://52.47.193.26:9000 \
                     -Dsonar.login=54f6a0567ef5a12acda5eecee7ce51e0feb16bb1
                '''
            }
        }
        stage('artifact') {
            steps {
                sh 'mvn clean package'
            }
        }
        stage('deploy') {
            steps {
                deploy adapters:[
                    tomcat9(
                        credentialsId: 'your-tomcat-credentials-id',
                        path: '',
                        url: 'http://<public-ip>:8080/'
                        )
                    ],
                    contextPath: 'netflix',
                    war: 'target/*.war'
            }
        }
    }
}

Troubleshooting Techniques

1. Server Level:

• Check Console Output.

• Verify Maven and Java installations.

• Review dependencies.

2. Job Level:

• Verify repository and branch configurations.

• Double-check syntax.

• Ensure plugins are correctly installed.

Conclusion

Setting up Tomcat for Jenkins deployment enhances your continuous integration and deployment capabilities. By integrating the Tomcat server with Jenkins and using the Deploy to Container plugin, you can seamlessly deploy your Java applications. Troubleshooting techniques at both server and job levels ensure a smooth and reliable deployment process.