CI/CD

Create and push source code to repository: Maven web project in GitHub

• $ mvn archetype:generate -DgroupId=io.github.likarajo -DartifactId=helloworld -DarchetypeArtifactId=maven-archetype-webapp
• push the project files to Git repository

Run Web Server: (in either of the following ways)

• Pull Tomcat docker image and run it

  • $ docker run -it --rm -d -p 9090:8080 tomcat:8.0
  • $ docker ps
CONTAINER ID IMAGE PORTS
b39e0ace38a0 tomcat:8.0 0.0.0.0:8088->8080/tcp

• Download, install, and run startup.sh script

  • Set the desired connector port in $TOMCAT_HOME/conf/server.xml file
  • $ $TOMCAT_HOME/bin/startup.sh
  • $ ps -ef | grep tomcat
    501 11066 1 0 1:40PM ?? 0:06.20 /Library/Java/JavaVirtualMachines/jdk1.8.0_181.jdk/Contents/Home/bin/java -Djava.util.logging.config.file=/usr/local/apache-tomcat-x.x.xconf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager -Djdk.tls.ephemeralDHKeySize=2048 -Djava.protocol.handler.pkgs=org.apache.catalina.webresources -Dorg.apache.catalina.security.SecurityListener.UMASK=0027 -Dignore.endorsed.dirs= -classpath /usr/local/apache-tomcat-x.x.x/bin/bootstrap.jar:/usr/local/apache-tomcat-x.x.x/bin/tomcat-juli.jar -Dcatalina.base=/usr/local/apache-tomcat-x.x.x -Dcatalina.home=/usr/local/apache-tomcat-x.x.x -Djava.io.tmpdir=/usr/local/apache-tomcat-x.x.x/temp org.apache.catalina.startup.Bootstrap start

• Using the IP and port, open the Tomcat page in web browser
  https://[IP]:[PORT]

Configure the web server

• Create role(s) and user(s) in the file $TOMCAT_HOME/conf/tomcat-users.xml

  <role rolename="manager-gui"/>
<role rolename="manager-script"/>
<user username="admin" password="admin" roles="manager-gui, manager-script"/>
<user username="deployer" password="deployer" roles="manager-script"/>
<user username="tomcat" password="passw0rd" roles="manager-gui/>

Run CI/CD Server: (in either of the following ways)

• Pull Jenkins docker image and run it

  • $ docker run -it --rm -d -p 8080:8080 jenkins
  • $ docker ps
CONTAINER ID IMAGE PORTS
b39e0ace38a0 jenkins 0.0.0.0:8080->8080/tcp, 0.0.0.0:50000->50000/tcp .

• Download, install, and run jenkins.war file

  • $ java -jar $JENKINS_HOME/jenkins.war
  • $ ps -ef | grep jenkins
    270 10642 1 0 12:47PM ?? 6:25.05 /usr/bin/java -Dfile.encoding=UTF-8 -XX:PermSize=256m -XX:MaxPermSize=512m -Xms256m -Xmx512m -Djava.io.tmpdir=/Users/Shared/Jenkins/tmp -jar /Applications/Jenkins/jenkins.war --httpPort=8080

• Using the IP and port, open the Jenkins page in web browser
  https://[IP]:[PORT]

• Jenkins initial setup is required using an admin user created and a password generated
  which can be found at: /var/jenkins_home/secrets/initialAdminPassword OR by $docker logs <container id>

Configure the CI/CD server

• Manage Plugins

  • Install Git plugin
  • Install GitHub plugin
  • Install Maven Integration plugin
  • Install Deploy to Container plugins

• Global Tool Configuration

  • Specify JDK installation
  • Specify Maven installation

• Configure Credentials (Global)

  • Set Web server credentials (User and password): Use the user (from $TOMCAT_HOME/conf/tomcat-users.xml) with manager-script role
  • Set Repository access token credentials (Secret Text): GitHub Access Token {GitHub_Profile>settings>Developer settings>Personal Access Tokens} + {GitHub_Repo>settings>webhooks}
  • Set repository credentials (User and password): GitHub Credentials

• Configure System

  • Add GitHub Server (use the GitHub access token)

Create New Job and configure for Integration i.e. Build

• Specify Project name: devops-helloworld
• General>GitHub Project>Project URL: https://github.com/likarajo/devops-helloworld
• SCM>Git>Repository URL: https://github.com/likarajo/devops-helloworld.git
• Specify Branches to build: master
• Specify Build -> Root POM: helloworld/pom.xml; Goals and Options: clean install package
• Build the project

Configure the job for Deployment

• Specify Post-build Actions: Deploy war/ear to a container

  • WAR/EAR Files: */.war (the workspace directory)
  • Add Container: Tomcat 8.x; Credentials:; URL:

• Build the project

On successful build

• the war file gets deployed to $TOMCAT_HOME/webapps

Configure the job for Continuous Integration/Build and Deployment (CI CD)

• Check the required option(s) in Build Triggers section
  • GitHub hook trigger for GITScm polling
  • Poll SCM: Schedule */2 * * * * (every two minutes poll the SCM (Git in this case) to check for changes)