CI/CD with Jenkins
Installing Jenkins
Install jenkins by following the instructions specific to your operating system of choice - Installing Jenkins.
We can use bellow commands to install Jenkins in RHEL 9 system:
dnf install -y wget java-17-openjdk
wget -O /etc/yum.repos.d/jenkins.repo https://pkg.jenkins.io/redhat-stable/jenkins.repo
rpm --import https://pkg.jenkins.io/redhat-stable/jenkins.io-2023.key
dnf install -y jenkins
Then we can use systemd to start the jenkins service:
service jenkins start
Running jenkins in docker
Pull the LTS Jenkins image:
docker pull jenkins/jenkins:lts
Run jenkins:
docker run --detach --publish 8080:8080 --volume jenkins_home:/var/jenkins_home --name jenkins jenkins/jenkins:lts
Print the initial admin password:
docker exec jenkins cat /var/jenkins_home/secrets/initialAdminPassword
Go to http://localhost:8080, provide the above admin password. Next step, we may select install suggested plugins.
Alternatively, we could share an existing JENKINS_HOME data directory with the container.
export JENKINS_HOME=/workspaces/jenkins_home
docker run -d --rm -p 8080:8080 -v $JENKINS_HOME:/var/lib/jenkins -e JENKINS_HOME=/var/lib/jenkins jenkins/jenkins:lts
Jenkins CLI tool
When the Jenkins server is running, the CLI tool can be downloaded from:
$JENKINS_URL/jnlpJars/jenkins-cli.jar
.
wget http://localhost:8080/jnlpJars/jenkins-cli.jar
chmod +x jenkins-cli.jar
Backup and restore Jenkins data
See https://www.jenkins.io/doc/book/system-administration/backing-up/