How to install Jenkins

Approach 1: Installing Jenkins as a service in Linux machine

For Centos7/Redhat/OracleLinux operating system

Go to Jenkins official download page Jenkins official download page

Click on Linux

Click on Red Hat / CentOS

Prerequisites:

• Java should be installed, preferably Java 11

Run the below commands to install Jenkins stable release and Java 11

sudo wget -O /etc/yum.repos.d/jenkins.repo \
    https://pkg.jenkins.io/redhat-stable/jenkins.repo
sudo rpm --import https://pkg.jenkins.io/redhat-stable/jenkins.io.key
sudo yum upgrade
sudo yum install jenkins java-11-openjdk-devel
sudo systemctl daemon-reload

Start and enable the Jenkins to automatically start after reboot

sudo systemctl start jenkins
sudo systemctl enable jenkins

Check the Jenkins running status

sudo systemctl status jenkins

For Ubuntu operating system

Go to Jenkins official download page Jenkins official download page

Click on Linux

Click on Debian/Ubuntu

Prerequisites:

• Java should be installed, preferably Java 11

Run the below commands to install Java 11

sudo apt update
sudo apt install openjdk-11-jdk

Run the below commands to install Jenkins stable release

wget -q -O - https://pkg.jenkins.io/debian-stable/jenkins.io.key | sudo apt-key add -
sudo sh -c 'echo deb https://pkg.jenkins.io/debian-stable binary/ > \
    /etc/apt/sources.list.d/jenkins.list'
sudo apt-get update
sudo apt-get install jenkins

Enable the Jenkins to automatically start after reboot

sudo systemctl status jenkins
sudo systemctl enable jenkins

Check the Jenkins running status

sudo systemctl status jenkins

Approach 2: Install Jenkins using docker

If you have followed Approach 1 you can skip Approach 2 and continue with Common steps for configuring Jenkins

Now we will install jenkins as a docker container

Ports

• 8080:8080 –> To see the Jenkins UI
• 50000:50000 –> This port is used for slave nodes to connnect, if it is configured

Volumes

• jenkins-volume:/var/jenkins_home –> This will create a docker volume named jenkins-volume and store the jenkins data from /var/jenkins_home jenkins/ where the jenkins data are stored

Problems:

• We cannot run docker commands if we run jenkins as docker container. Some alternatives are also there, will update soon.

docker run --name jenkins -d -p 8080:8080 -p 50000:50000 -v jenkins-volume:/var/jenkins_home jenkins/jenkins:lts-jdk11

Common steps for configuring Jenkins

Once Jenkins is installed, by default jenkins starts on port 8080

we can access the jenkins by opening the ip-address:8080 or localhost:8080 (if its insatlled locally) from the browser

Now get the initialadminpassword from /var/lib/jenkins/secrets/initialAdminPassword file

Change to root user and open the /var/lib/jenkins/secrets/initialAdminPassword file to get the password

Click on continue

Click on Install suggested plugins

This will automatically install the necessary plugins for Jenkins

Enter the username, password and click on Save and Continue

Click on Save and Finish

Click on Start using Jenkins

Jenkins Dashboard