Step-by-Step Guide to Installing and Upgrading Jenkins on Linux

This guide provides a comprehensive walkthrough for installing and upgrading Jenkins on Linux systems. Whether you're using Ubuntu, Debian, or RHEL-based distributions, you'll find detailed instructions to help you set up Jenkins efficiently. Follow along to ensure a smooth installation and upgrade process, tailored to your specific Linux environment.

https://www.jenkins.io/doc/book/installing/linux/#red-hat-centos

sudo su -
yum install wget -y

wget -O /etc/yum.repos.d/jenkins.repo \
    https://pkg.jenkins.io/redhat-stable/jenkins.repo
rpm --import https://pkg.jenkins.io/redhat-stable/jenkins.io-2023.key
yum upgrade
# Add required dependencies for the jenkins package
yum install fontconfig java-17-openjdk
yum install jenkins -y
systemctl daemon-reload

systemctl enable jenkins
systemctl start jenkins
systemctl status jenkins

Upgrade Jenkins to a Specific Version on Linux

To upgrade Jenkins to a specific version on Ubuntu/Debian or RHEL-based distributions, follow these steps:

Check Current Jenkins Version

Before upgrading, check the currently installed version and Stop Jenkins

jenkins --version
systemctl status jenkins | grep Active

sudo systemctl stop jenkins

To find the jenkins.war file location:

sudo find / -name "jenkins.war"

Example Output

/usr/share/jenkins/jenkins.war
/opt/jenkins/jenkins.war

This means the jenkins.war file is present in two locations.

1.Stop Jenkins

sudo systemctl stop jenkins

2.Backup the existing jenkins.war

sudo mv /usr/share/jenkins/jenkins.war /usr/share/jenkins/jenkins.war.bak

3.Download the specific/stable version:

If you want a specific version, replace latest in the URL with the version number:

https://updates.jenkins.io/download/war/ (Right click copy link address)

wget -O /usr/share/jenkins/jenkins.war https://get.jenkins.io/war-stable/2.375.2/jenkins.war

4. Restart Jenkins

sudo systemctl start jenkins
sudo systemctl restart jenkins

Check the version again

jenkins --version

conclusion : installing and upgrading Jenkins on Linux systems can be a straightforward process when following the right steps. By carefully checking the current version, stopping Jenkins, backing up existing files, and downloading the desired version, you can ensure a smooth transition. Whether you're using Ubuntu, Debian, or RHEL-based distributions, these guidelines will help you maintain an efficient and up-to-date Jenkins environment, supporting your continuous integration and delivery needs effectively.