HOW TO INSTALL JENKINS ON UBUNTU 20.04

An open source automation server that automates the repetitive technical tasks involved in the continuous integration and delivery of software.

Prerequisites

• A non-root sudo user
• A firewall
• Atleast 1 GB RAM

Install jenkins

1. Add Repository key

• wget -q -O – https://pkg.jenkins.io/debian-stable/jenkins.io.key | sudo apt-key add –

2. Append the Debian package repository address to the server’s sources.list

• sudo sh -c ‘echo deb http://pkg.jenkins.io/debian-stable binary/ > /etc/apt/sources.list.d/jenkins.list’

3. Next update apt

• sudo apt update

4. Install Jenkins

• sudo apt install jenkins

Starting Jenkins

• sudo systemctl start jenkins

To verify if Jenkins started or not

• sudo systemctl status jenkins

If everything gone well,output will show as follows

Output

• jenkins.service – LSB: Start Jenkins at boot time

   Loaded: loaded (/etc/init.d/jenkins; generated)

   Active: active (exited) since Fri 2020-06-05 21:21:46 UTC; 45s ago

     Docs: man:systemd-sysv-generator(8)

    Tasks: 0 (limit: 1137)

   CGroup: /system.slice/jenkins.service

Now let’s adjust our firewall rules:

• Sudo ufw allow 8080
• sudo ufw allow OpenSSH
• sudo ufw enable

We can check status of ufw to confirm new rules

• Sudo ufw status

Output

Status: active

To                         Action      From

—                         ——      —-

OpenSSH                    ALLOW       Anywhere

8080                       ALLOW       Anywhere

OpenSSH (v6)               ALLOW       Anywhere (v6)

8080 (v6)                  ALLOW       Anywhere (v6)

Setting up Jenkins

Visit Jenkins using  http://your_server_ip_or_domain:8080

It will display Unlock Jenkins screen asking Administrator password and location of initial password

Get password through terminal using,

• sudo cat /var/lib/jenkins/secrets/initialAdminPassword

After copy pasting password to screen,next screen to install plugins will appear

Installation process begin immediately

After successful completion of installation, the next screen will appear asking to set up the first administrative user.

Either you can continue with admin and initial password or create a new user

Next an instance Configuration page will appear asking you to confirm your URL for Jenkins instance.

• Either you can give domain name or your server’sIP address

A confirmation page showing Jenkins is Ready will appear

• Click Start using Jenkins

Now Jenkins main dashboard will come.At this point you have successfully completed Jenkins installation.