How to install Jenkins on Ubuntu 20.04?

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Hi, folks. In this post as a guide, you will learn how to install Jenkins on Ubuntu 20.04

Continuous integration and Jenkins

In a production environment, the software is developed and compiled frequently. In addition to this, it needs to be tested quite a few times. With each change in the source code, it is necessary to start the whole process over again.

Jenkins automates all these tasks quickly and easily. So, the process where all the changes and functions of the application in development are automatically verified is called continuous integration.

In this sense, using Jenkins the developer will know at all times the status of his application. Failures, new features, and processes will be automated and monitored with Jenkins.

Install Jenkins on Ubuntu 20.04

Because it is an application created in Java, Jenkins can be installed on any system that supports this programming language.

However, we will use a dedicated repository to make the installation even easier. Also, it will help to have recent versions of the application.

1.- Install Java on Ubuntu 20.04

Jenkins is made in Java, so the first step is to install Java on Ubuntu 20.04

Previously, only the application supported Java 8, but now it also supports Java 11.

So to install Java just run the following command:

:~$ sudo apt install openjdk-11-jre openjdk-11-jdk
Reading package lists… Done
Building dependency tree
Reading state information… Done
The following additional packages will be installed:
at-spi2-core ca-certificates-java fonts-dejavu-extra java-common libatk-bridge2.0-0 libatk-wrapper-java libatk-wrapper-java-jni libatk1.0-0 libatk1.0-data
libatspi2.0-0 libdrm-amdgpu1 libdrm-intel1 libdrm-nouveau2 libdrm-radeon1 libfontenc1 libgif7 libgl1 libgl1-mesa-dri libglapi-mesa libglvnd0 libglx-mesa0 libglx0
libice-dev libice6 libllvm9 libnspr4 libnss3 libpciaccess0 libpcsclite1 libpthread-stubs0-dev libsensors-config libsensors5 libsm-dev libsm6 libvulkan1
libwayland-client0 libx11-dev libx11-xcb1 libxau-dev libxaw7 libxcb-dri2-0 libxcb-dri3-0 libxcb-glx0 libxcb-present0 libxcb-randr0 libxcb-shape0 libxcb-sync1
libxcb1-dev libxcomposite1 libxdamage1 libxdmcp-dev libxfixes3 libxft2 libxi6 libxinerama1 libxkbfile1 libxmu6 libxrandr2 libxrender1 libxshmfence1 libxt-dev libxt6
libxtst6 libxv1 libxxf86dga1 libxxf86vm1 mesa-vulkan-drivers openjdk-11-jdk-headless openjdk-11-jre-headless x11-common x11-utils x11proto-core-dev x11proto-dev
xorg-sgml-doctools xtrans-dev
Suggested packages:
default-jre libice-doc pcscd lm-sensors libsm-doc libx11-doc libxcb-doc libxt-doc openjdk-11-demo openjdk-11-source visualvm libnss-mdns fonts-ipafont-gothic
fonts-ipafont-mincho fonts-wqy-microhei | fonts-wqy-zenhei fonts-indic mesa-utils
The following NEW packages will be installed:
at-spi2-core ca-certificates-java fonts-dejavu-extra java-common libatk-bridge2.0-0 libatk-wrapper-java libatk-wrapper-java-jni libatk1.0-0 libatk1.0-data
libatspi2.0-0 libdrm-amdgpu1 libdrm-intel1 libdrm-nouveau2 libdrm-radeon1 libfontenc1 libgif7 libgl1 libgl1-mesa-dri libglapi-mesa libglvnd0 libglx-mesa0 libglx0
libice-dev libice6 libllvm9 libnspr4 libnss3 libpciaccess0 libpcsclite1 libpthread-stubs0-dev libsensors-config libsensors5 libsm-dev libsm6 libvulkan1
libwayland-client0 libx11-dev libx11-xcb1 libxau-dev libxaw7 libxcb-dri2-0 libxcb-dri3-0 libxcb-glx0 libxcb-present0 libxcb-randr0 libxcb-shape0 libxcb-sync1
libxcb1-dev libxcomposite1 libxdamage1 libxdmcp-dev libxfixes3 libxft2 libxi6 libxinerama1 libxkbfile1 libxmu6 libxrandr2 libxrender1 libxshmfence1 libxt-dev libxt6
libxtst6 libxv1 libxxf86dga1 libxxf86vm1 mesa-vulkan-drivers openjdk-11-jdk openjdk-11-jdk-headless openjdk-11-jre openjdk-11-jre-headless x11-common x11-utils
x11proto-core-dev x11proto-dev xorg-sgml-doctools xtrans-dev
0 upgraded, 77 newly installed, 0 to remove and 0 not upgraded.
Need to get 294 MB of archives.
After this operation, 789 MB of additional disk space will be used.
Do you want to continue? [Y/n]
1.- Install Java on Ubuntu 20.04
1.- Install Java on Ubuntu 20.04

Accept the installation and Java will be ready for work.

Also read:

How to install Oracle Java 14 on Ubuntu 20.04

2.- Install Jenkins on Ubuntu 20.04

Now you have to add the Jenkins repository. But first, add the GPG key to secure the repository. Make sure you have the package apt-transport-https installed.

:~$ sudo apt install apt-transport-https
:~$ wget -q -O - https://pkg.jenkins.io/debian-stable/jenkins.io.key | sudo apt-key add -
OK

Now add the repository to the system’s source list:

:~$ sudo apt-add-repository "deb https://pkg.jenkins.io/debian-stable binary"

And then, he proceeds to install Jenkins in Ubuntu.

:~$ sudo apt update
:~$ sudo apt install jenkins
Reading package lists… Done
Building dependency tree
Reading state information… Done
The following additional packages will be installed:
daemon net-tools
The following NEW packages will be installed:
daemon jenkins net-tools
0 upgraded, 3 newly installed, 0 to remove and 47 not upgraded.
Need to get 65.5 MB of archives.
After this operation, 67.4 MB of additional disk space will be used.
Do you want to continue? [Y/n]
2.- Install Jenkins on Ubuntu 20.04
2.- Install Jenkins on Ubuntu 20.04

Jenkins is handled in the system as a service. Therefore, you can check the status with the following command:

:~$ sudo systemctl status jenkins
● jenkins.service - LSB: Start Jenkins at boot time
Loaded: loaded (/etc/init.d/jenkins; generated)
Active: active (exited) since Thu 2020-05-14 05:32:17 UTC; 1min 45s ago
Docs: man:systemd-sysv-generator(8)
Tasks: 0 (limit: 506)
Memory: 0B
CGroup: /system.slice/jenkins.service
May 14 05:32:10 osradar systemd[1]: Starting LSB: Start Jenkins at boot time…
May 14 05:32:13 osradar jenkins[9478]: Correct java version found
May 14 05:32:14 osradar jenkins[9478]: * Starting Jenkins Automation Server jenkins
May 14 05:32:14 osradar su[9519]: (to jenkins) root on none
May 14 05:32:14 osradar su[9519]: pam_unix(su-l:session): session opened for user jenkins by (uid=0)
May 14 05:32:17 osradar jenkins[9478]: …done.
May 14 05:32:17 osradar systemd[1]: Started LSB: Start Jenkins at boot time.
3.- Jenkins status on Ubuntu 20.04
3.- Jenkins status on Ubuntu 20.04

As you can see, everything is going well. If an error occurs, it is probably a question of a lack of RAM memory.

Jenkins takes the issue of security very seriously, therefore, the installer generates a temporary key to continue with the installation.

To show it, just run the following command:

:~ sudo cat /var/lib/jenkins/secrets/initialAdminPassword

So, in my case, this is the password.

3596a99b1f384a9db3e0eab32c59fe1d
4.- Jenkins temporarily password
4.- Jenkins temporarily password

Also, it doesn’t have to be the same as mine.

3.- Complete the Jenkins installation

Now open your favorite web browser and go to http://your-server:8080 and complete the installation.

The first thing you will see is that you will be prompted for the temporary password that we have shown above.

5.- Unlock Jenkins
5.- Unlock Jenkins

Then, you will be able to customize the Jenkins installation. You can either install the recommended plugins or choose the ones you want. I have chosen the first option.

6.- Configuring the Jenkins installation
6.- Configuring the Jenkins installation

Then the installation of the plugins will start.

7.- Installing Jenkins on Ubuntu 20.04
7.- Installing Jenkins on Ubuntu 20.04

So, when it is finished, you will have to create the administrator user.

8.- Creating the admin user for Jenkins
8.- Creating the admin user for Jenkins

Now, you will see the configuration of the Jenkins instance.

9.- Instance configuration
9.- Instance configuration

Then, you will see this screen indicating that everything has gone well and that you can use Jenkins.

10.- Jenkins installed
10.- Jenkins installed

Finally, you will see the dashboard of Jenkins on Ubuntu 20.04

11.- Jenkins on Ubuntu 20.04
11.- Jenkins on Ubuntu 20.04

So, Jenkins is ready for the action.

Conclusion

Jenkins is a very important application in the current and facilitates many tasks dedicated to the life process of software. So, despite that, it is very easy to install in Ubuntu 20.04

So, please share this post, join our Telegram channel. And if you can, buy us a coffee.

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