How To Install Jenkins on Ubuntu 16.04 LTS

Install Jenkins on Ubuntu

As my assume you are System administrator or DevOps guy to read my article to install Jenkins on Ubuntu, I will summary step by step and straight to the point just copy and paste.

Warning: Do not skip any step, you will get an error. To resolve it reset step again and follow one by one.

Step 1: Installing Jenkins

First, we’ll add the repository key to the system.

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

When the key is added, the system will return OK. Next, we’ll append the Debian package repository address to the server’s sources.list:

$ echo deb http://pkg.jenkins.io/debian-stable binary/ | sudo tee /etc/apt/sources.list.d/jenkins.list

When both of these are in place, we’ll run update so that apt-get will use the new repository:

$ sudo apt-get update

Finally, we’ll install Jenkins and its dependencies, including Java:

$ sudo apt-get install jenkins

Now that Jenkins and its dependencies are in place, we’ll start the Jenkins server.

Step 2 : Starting Jenkins

Using systemctl we’ll start Jenkins:

$ sudo systemctl start jenkins

Since systemctl doesn’t display output, we’ll use its status command to verify that it started successfully:

$ sudo systemctl status jenkins

If everything went well, the beginning of the output should show that the service is active and configured to start at boot:

Output
● jenkins.service - LSB: Start Jenkins at boot time
  Loaded: loaded (/etc/init.d/jenkins; bad; vendor preset: enabled)
  Active:active (exited) since Thu 2021-02-20 16:51:13 UTC; 2min 7s ago
    Docs: man:systemd-sysv-generator(8)

Now that Jenkins is running, we’ll adjust our firewall rules so that we can reach Jenkins from a web browser to complete the initial set up.

Step 3 : Opening the Firewall

By default, Jenkins runs on port 8080, so we’ll open that port using ufw:

$ sudo ufw allow 8080

We can see the new rules by checking UFW’s status.

$ sudo ufw status

We should see that traffic is allowed to port 8080 from anywhere:

Output
Status: active
To                         Action      From
--                         ------      ----
OpenSSH                    ALLOW       Anywhere
8080                       ALLOW       Anywhere
OpenSSH (v6)               ALLOW       Anywhere (v6)
8080 (v6)                  ALLOW       Anywhere (v6)

Step 4 : Setting up Jenkins

To set up our installation, we’ll visit Jenkins on its default port, 8080, using the server domain name or IP address: http://ip_address_or_domain_name:8080

We should see “Unlock Jenkins” screen, which displays the location of the initial password

You need to to copy admin password in file initialAdminPassword

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

Getting Started Jenkins — Unlock Screen

Copy the 32-character alphanumeric password from the terminal and paste it into the “Administrator password” field, then click “Continue”. The next screen presents the option of installing suggested plugins or selecting specific plugins.

Customize Jenkins Plugin — Install suggested plugins

Click Install suggested plugins option, which will immediately begin the installation process:

Install Plugin Jenkins

When the installation is complete, we’ll be prompted to set up the first administrative user. It’s possible to skip this step and continue as admin using the initial password we used above, but we’ll take a moment to create the user.

Admin user setup of Jenkins

Once the first admin user is in place, you should see a “Jenkins is ready!” confirmation screen.

Jenkins is ready! — you can start using it.

Click Start using Jenkins to visit the main Jenkins dashboard:

At this point, Jenkins has been successfully installed.

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Conclusion

In this article, you’ve installed Jenkins using the project-provided packages, started the server, opened the firewall, and created an administrative user. At this point, you can start exploring Jenkins.

I recommended you to upgrade HTTP protocol to SSL for protect passwords, as well as any sensitive system or product information that will be sent between your machine and the server in plain text.

I will write two articles which one use Apache2 web server as reverse proxy for Jenkins and Using Nginx Reverse Proxy. you can choose which one is your familiar.

• Install and Configure Apache as Reverse Proxy for Jenkins

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