Tomcat Web Application Server

Jenkins_Master Node(VM)

• Install jdk,jenkins,git.

• Used to Create the CI/CD Pipeline Projects and schedule to run in slave nodes.

Jenkins_Slave Node(VM)

• To Execute the Application Build.

• Perform Application Build - Compile, Unit Test, Create Artifacts

Tomcat_Server (VM)

• To Execute and Test the Application Artifacts (*.war)

  • Install jdk, Tomcat.

  • Tomcat runs in port 8080

Install Tomcat server on ubuntu and configure

• Launch New Node - Ubuntu - 22.04 ami

  • Enable port 8080

• Install Tomcat :: https://tomcat.apache.org/download-80.cgi

  https://tomcat.apache.org/

  • sudo -i

  • apt update -y

  • apt-get install default-jdk -y

  • java --version

  • cd /opt/

  • wget https://archive.apache.org/dist/tomcat/tomcat-8/v8.5.99/bin/apache-tomcat-8.5.99.tar.gz

  • tar -xvzf /opt/apache-tomcat-8.5.99.tar.gz

  • mv apache-tomcat-8.5.99 tomcat

  • cd tomcat/bin/

  • ./startup.sh # Used to Start the Tomcat Server

• Open web browser :

  http://<Public_IP_Address>:8080/

• Add User

  • useradd <username> -s /bin/bash -m -d /home/<username>

  • su - <username>

• ssh-keygen

  • ssh-keygen -t ecdsa -b 521

  • ls ~/.ssh

  • You should see following two files:

    • id_ecdsa - private key

    • id_ecdsa.pub - public key

  • cat id_ecdsa.pub > authorized_keys

  • chmod 600 /home/<username>/.ssh/*

• make created user as a owner to tomcat dir

  • chown -R <username> /opt/tomcat - run as a root user

• Publish Over SSH Plugin is used to copy the artifacts from Jenkins Slave Node to Tomcat Server

  • Install Publish Over SSH Plugin in Jenkins Master.

Deployment

Creation of target server

• Click on manage Jenkins

• Click on system

• Scroll to the bottom and find the Publish over SSH section, then click on "Add" to add an SSH server.

  • 

• Enter the name, hostname, username, and remote directory. Then click on Advanced

  • 

• Check the "Use password authentication, or use a different key" option and add private keys in the keys field.

  • 

• Click on "Test Configuration," and a success status should be displayed.

  • 

Update the Pipeline with the deployment parameter using pipeline snippet generator

• Select sshPublisher from the snippet generator dropdown.

  • 

• Add the source file, remove the prefix, and specify the remote directory, then click on generate pipeline script.

  • 

• Once pipeline script is ready, add script to the pipeline

  •     pipeline {
            agent { label 'slave' }
            stages {
                stage('SCM_Checkout') {
                    steps {
                       echo "Perform SCM Checkout"
                       git 'https://github.com/SA-Team-DevOps-03-Dec-24/java-mvn-springbootapp.git'               
                    }
                }
                stage('Application Build') {
                    steps {
                        echo "Perform Application Build"
                        sh 'mvn clean package'
                    }
                }
                stage('Deploy to the test server') {
                    steps {
                        script{
                            sshPublisher(publishers: [sshPublisherDesc(configName: 'tomcat_server', transfers: [sshTransfer(cleanRemote: false, excludes: '', execCommand: '', execTimeout: 120000, flatten: false, makeEmptyDirs: false, noDefaultExcludes: false, patternSeparator: '[, ]+', remoteDirectory: '.', remoteDirectorySDF: false, removePrefix: 'target/', sourceFiles: '/target/*.war')], usePromotionTimestamp: false, useWorkspaceInPromotion: false, verbose: false)])
                        }
                    }
                }
              }
            }
    

• Save and run build

• Deployment is done

  • 

• war file is copied to tomcat_server

  • 

• Now copy the public IP of the Tomcat server, access it using port 8080, and add the artifact name.

  •