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Jenkins installation guide on Ubuntu Server

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Install Jenkins on Ubuntu Server

Update the package list

sudo apt update

Add Jenkins repository key

sudo wget -O /usr/share/keyrings/jenkins-keyring.asc \
https://pkg.jenkins.io/debian-stable/jenkins.io-2023.key

Then add a Jenkins apt repository entry:

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

Update the package list

sudo apt update

Install Java (Jenkins requires Java)

sudo apt-get install fontconfig openjdk-17-jre -y

Add Jenkins repository to sources list

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

Update package list again to include Jenkins repository

sudo apt update

Install Jenkins

sudo apt install -y jenkins

Start Jenkins service

sudo systemctl start jenkins

Enable Jenkins to start on boot

sudo systemctl enable jenkins

Display initial Jenkins admin password

echo "Waiting for Jenkins to start..."
sleep 60 # Wait for Jenkins to fully start (adjust if needed)

Retrieve the initial admin password

JENKINS_PASSWORD=$(sudo cat /var/lib/jenkins/secrets/initialAdminPassword)
echo "Jenkins initial admin password: $JENKINS_PASSWORD"
echo "Access Jenkins at http://your-server-ip:8080"

Nicer Paassword Output:

echo -e "===========Initial Admin Password ===========\n"
sudo cat /var/lib/jenkins/secrets/initialAdminPassword
echo -e "\n"
echo -e "===========Initial Admin Password ==========="

Open the firewall to allow access to Jenkins

sudo ufw allow 8080

Display Jenkins status

sudo systemctl status jenkins | cat