Install Jenkins on Debian

Update the packages:

sudo apt update -y
sudo apt upgrade -y

Jenkins is written in Java, so we need it:

sudo apt install openjdk-17-jdk default-jre gnupg2 apt-transport-https wget -y

Check whether Java is installed:

java -version

Add Jenkins GPG key and PPA

curl -fsSL https://pkg.jenkins.io/debian-stable/jenkins.io-2023.key | sudo tee \
/usr/share/keyrings/jenkins-keyring.asc 
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 
sudo apt update -y

Install Jenkins:

sudo apt-get install jenkins -y

Start and enable the Jenkins service

sudo systemctl enable jenkins --now
sudo systemctl status jenkins

Finish Jenkins Installation - navigate to http://x.x.x.x:8080, Jenkins is asking to be unlocked, the password is:

cat /var/lib/jenkins/secrets/initialAdminPassword

Install suggested plugins and create first Admin user then click on Save and Continue then Save and Finish.