How to install Jenkins on Ubuntu

The Jenkins web application is written in java and we will additionally install the openjdk package for its operation. This instruction is written on the example of Ubuntu Server 20.04.

System preparation

We will update the list of packages, set the correct server time and configure the firewall.

Updating the list of packages in repositories

To be able to install packages, run the command:

apt-get update

Set the time, timezone:

To set the time, set the time zone:

timedatectl set-timezone Europe/London

Install the time synchronization service:

apt-get install chrony

Allow it to autorun:

systemctl enable chrony

Installing Jenkins

1. Installing openjdk

apt-get install default-jdk

1. Installing Jenkins

Add repository:

nano /etc/apt/sources.list.d/jenkins.list
deb https://pkg.jenkins.io/debian-stable binary/

Import the public key to connect to the repository:

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

Update the package list:

apt-get update

Install jenkins:

apt-get install jenkins

Let’s autostart the service:

systemctl enable jenkins

3. Completing the installation

Open a browser and go to http://Jenkins server IP addresses:8080 – the “Unlock Jenkins” window will open. It will contain the path to the file in which you need to take the passphrase to unlock the portal:

Enter the command on the server:

cat /var/lib/jenkins/secrets/initialAdminPassword

We should see something like:

# cat /var/lib/jenkins/secrets/initialAdminPassword
69635dce8b014707a2ec90937763ffe3

Use this password and paste it into the Administrator password field:

In the next window, select the option to install plugins – recommended or optional:

The Jenkins deployment process will start:

After we create an account for the administrator.

On the last page, we can set the URL for our portal (or leave the IP address):

Installation completed.