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⇑ Installing Jenkins
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Linux

Jenkins installers are available for several Linux distributions.

Prerequisites

Minimum hardware requirements:

  • 256 MB of RAM

  • 1 GB of drive space (although 10 GB is a recommended minimum if running Jenkins as a Docker container)

Recommended hardware configuration for a small team:

  • 4 GB+ of RAM

  • 50 GB+ of drive space

Comprehensive hardware recommendations:

Software requirements:

Debian/Ubuntu

On Debian and Debian-based distributions like Ubuntu you can install Jenkins through apt.

Long Term Support release

A LTS (Long-Term Support) release is chosen every 12 weeks from the stream of regular releases as the stable release for that time period. It can be installed from the debian-stable apt repository.

curl -fsSL https://pkg.jenkins.io/debian-stable/jenkins.io.key | sudo tee \
  /usr/share/keyrings/jenkins-keyring.asc > /dev/null
echo deb [signed-by=/usr/share/keyrings/jenkins-keyring.asc] \
  https://pkg.jenkins.io/debian-stable binary/ | sudo tee \
  /etc/apt/sources.list.d/jenkins.list > /dev/null
sudo apt-get update
sudo apt-get install jenkins

Weekly release

A new release is produced weekly to deliver bug fixes and features to users and plugin developers. It can be installed from the debian apt repository.

curl -fsSL https://pkg.jenkins.io/debian/jenkins.io.key | sudo tee \
  /usr/share/keyrings/jenkins-keyring.asc > /dev/null
echo deb [signed-by=/usr/share/keyrings/jenkins-keyring.asc] \
  https://pkg.jenkins.io/debian binary/ | sudo tee \
  /etc/apt/sources.list.d/jenkins.list > /dev/null
sudo apt-get update
sudo apt-get install jenkins

If an error is reported, “jenkins : Depends: daemon but it is not installable”, add the "universe" apt repository of community maintained free and open source software for Ubuntu by executing this command after sudo apt-get update:

sudo add-apt-repository universe

This package installation will:

  • Setup Jenkins as a daemon launched on start. See /etc/init.d/jenkins for more details.

  • Create a ‘jenkins’ user to run this service.

  • Direct console log output to the file /var/log/jenkins/jenkins.log. Check this file if you are troubleshooting Jenkins.

  • Populate /etc/default/jenkins with configuration parameters for the launch, e.g JENKINS_HOME

  • Set Jenkins to listen on port 8080. Access this port with your browser to start configuration.

If your /etc/init.d/jenkins file fails to start Jenkins, edit the /etc/default/jenkins to replace the line ----HTTP_PORT=8080---- with ----HTTP_PORT=8081---- Here, "8081" was chosen but you can put another port available.

Installation of Java

Jenkins requires Java in order to run, yet certain distributions don’t include this by default and some Java versions are incompatible with Jenkins.

There are multiple Java implementations which you can use. OpenJDK is the most popular one at the moment, we will use it in this guide.

To install the Open Java Development Kit (OpenJDK) run the following:

  • Update the repositories

sudo apt update

  • search of all available packages:

sudo apt search openjdk

  • Pick one option and install it:

sudo apt install openjdk-11-jdk

  • Confirm installation:

sudo apt install openjdk-11-jdk

  • checking installation:

java -version

  • the result must be something like:

openjdk version "11.0.9.1" 2020-11-04
OpenJDK Runtime Environment (build 11.0.9.1+1-post-Debian-1deb10u2)
OpenJDK 64-Bit Server VM (build 11.0.9.1+1-post-Debian-1deb10u2, mixed mode, sharing)

Why use apt and not apt-get or another command? The apt command has been available since 2014. It has a command structure that is similar to apt-get but was created to be a more pleasant experience for typical users. Simple software management tasks like install, search and remove are easier with apt.

Fedora

You can install Jenkins through dnf. You need to add the Jenkins repository from the Jenkins website to the package manager first.

Long Term Support release

A LTS (Long-Term Support) release is chosen every 12 weeks from the stream of regular releases as the stable release for that time period. It can be installed from the redhat-stable yum repository.

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 dnf upgrade
# Add required dependencies for the jenkins package
sudo dnf install chkconfig java-devel
sudo dnf install jenkins

Weekly release

A new release is produced weekly to deliver bug fixes and features to users and plugin developers. It can be installed from the redhat yum repository.

sudo wget -O /etc/yum.repos.d/jenkins.repo \
    https://pkg.jenkins.io/redhat/jenkins.repo
sudo rpm --import https://pkg.jenkins.io/redhat/jenkins.io.key
sudo dnf upgrade
sudo dnf install chkconfig java-devel
sudo dnf install jenkins

Start Jenkins

Register the Jenkins service with the command:

sudo systemctl daemon-reload

You can start the Jenkins service with the command:

sudo systemctl start jenkins

You can check the status of the Jenkins service using the command:

sudo systemctl status jenkins

If everything has been set up correctly, you should see an output like this:

Loaded: loaded (/etc/rc.d/init.d/jenkins; generated)
Active: active (running) since Tue 2018-11-13 16:19:01 +03; 4min 57s ago

If you have a firewall installed, you must add Jenkins as an exception. You must change YOURPORT in the script below to the port you want to use. Port 8080 is the most common.

YOURPORT=8080
PERM="--permanent"
SERV="$PERM --service=jenkins"

firewall-cmd $PERM --new-service=jenkins
firewall-cmd $SERV --set-short="Jenkins ports"
firewall-cmd $SERV --set-description="Jenkins port exceptions"
firewall-cmd $SERV --add-port=$YOURPORT/tcp
firewall-cmd $PERM --add-service=jenkins
firewall-cmd --zone=public --add-service=http --permanent
firewall-cmd --reload

Red Hat / CentOS

You can install Jenkins through yum on Red Hat Enterprise Linux, CentOS, and other Red Hat based distributions.

How To Install Jenkins on CentOS 7

You need to choose either the Jenkins Long Term Support release or the Jenkins weekly release.

Long Term Support release

A LTS (Long-Term Support) release is chosen every 12 weeks from the stream of regular releases as the stable release for that time period. It can be installed from the redhat-stable yum repository.

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 epel-release java-11-openjdk-devel
sudo yum install jenkins
sudo systemctl daemon-reload

Weekly release

A new release is produced weekly to deliver bug fixes and features to users and plugin developers. It can be installed from the redhat yum repository.

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

Start Jenkins

You can start the Jenkins service with the command:

sudo systemctl start jenkins

You can check the status of the Jenkins service using the command:

sudo systemctl status jenkins

If everything has been set up correctly, you should see an output like this:

Loaded: loaded (/etc/rc.d/init.d/jenkins; generated)
Active: active (running) since Tue 2018-11-13 16:19:01 +03; 4min 57s ago
...

If you have a firewall installed, you must add Jenkins as an exception. You must change YOURPORT in the script below to the port you want to use. Port 8080 is the most common.

YOURPORT=8080
PERM="--permanent"
SERV="$PERM --service=jenkins"

firewall-cmd $PERM --new-service=jenkins
firewall-cmd $SERV --set-short="Jenkins ports"
firewall-cmd $SERV --set-description="Jenkins port exceptions"
firewall-cmd $SERV --add-port=$YOURPORT/tcp
firewall-cmd $PERM --add-service=jenkins
firewall-cmd --zone=public --add-service=http --permanent
firewall-cmd --reload

Post-installation setup wizard

After downloading, installing and running Jenkins using one of the procedures above, the post-installation setup wizard begins.

This setup wizard takes you through a few quick "one-off" steps to unlock Jenkins, customize it with plugins and create the first administrator user through which you can continue accessing Jenkins.

Unlocking Jenkins

When you first access a new Jenkins instance, you are asked to unlock it using an automatically-generated password.

  1. Browse to http://localhost:8080 (or whichever port you configured for Jenkins when installing it) and wait until the Unlock Jenkins page appears.

    Unlock Jenkins page

  2. From the Jenkins console log output, copy the automatically-generated alphanumeric password (between the 2 sets of asterisks).

    Copying initial admin password
    Note:

    • The command: sudo cat /var/lib/jenkins/secrets/initialAdminPassword will print the password at console.

    • If you are running Jenkins in Docker using the official jenkins/jenkins image you can use sudo docker exec ${CONTAINER_ID or CONTAINER_NAME} cat /var/jenkins_home/secrets/initialAdminPassword to print the password in the console without having to exec into the container.

  3. On the Unlock Jenkins page, paste this password into the Administrator password field and click Continue.
    Notes:

    • You can always access the Jenkins console log from the Docker logs (above).

    • The Jenkins console log indicates the location (in the Jenkins home directory) where this password can also be obtained. This password must be entered in the setup wizard on new Jenkins installations before you can access Jenkins’s main UI. This password also serves as the default admininstrator account’s password (with username "admin") if you happen to skip the subsequent user-creation step in the setup wizard.

Customizing Jenkins with plugins

After unlocking Jenkins, the Customize Jenkins page appears. Here you can install any number of useful plugins as part of your initial setup.

Click one of the two options shown:

  • Install suggested plugins - to install the recommended set of plugins, which are based on most common use cases.

  • Select plugins to install - to choose which set of plugins to initially install. When you first access the plugin selection page, the suggested plugins are selected by default.

If you are not sure what plugins you need, choose Install suggested plugins. You can install (or remove) additional Jenkins plugins at a later point in time via the Manage Jenkins > Manage Plugins page in Jenkins.

The setup wizard shows the progression of Jenkins being configured and your chosen set of Jenkins plugins being installed. This process may take a few minutes.

Creating the first administrator user

Finally, after customizing Jenkins with plugins, Jenkins asks you to create your first administrator user.

  1. When the Create First Admin User page appears, specify the details for your administrator user in the respective fields and click Save and Finish.

  2. When the Jenkins is ready page appears, click Start using Jenkins.
    Notes:

    • This page may indicate Jenkins is almost ready! instead and if so, click Restart.

    • If the page does not automatically refresh after a minute, use your web browser to refresh the page manually.

  3. If required, log in to Jenkins with the credentials of the user you just created and you are ready to start using Jenkins!

⇑ Installing Jenkins
Index

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