How to install Jenkins in ubuntu

Install Java with Apt on Ubuntu

update your server: sudo apt update && apt upgrade -y

install the JRE: sudo apt install default-jre -y

Verify the installation: java -version

install JDK: sudo apt install default-jdk

Verify the installation: javac -version

Setting the JAVA_HOME Environment Variable: sudo update-alternatives --config java

sudo nano /etc/environment (At the end of this file, add the following line, making sure to replace the highlighted path with your own copied path, and to not include the bin/ portion of the path):

JAVA_HOME="/usr/lib/jvm/java-11-openjdk-amd64"

source /etc/environment

echo $JAVA_HOME

Install Jenkins on Ubuntu

Installing Jenkins: wget -q -O - https://pkg.jenkins.io/debian-stable/jenkins.io.key |sudo gpg --dearmor -o /usr/share/keyrings/jenkins.gpg

(watch video carefully for this line of code)

sudo apt update

sudo apt install jenkins

Starting Jenkins: sudo systemctl start jenkins.service

sudo systemctl status jenkins

Opening the Firewall: sudo ufw allow 8080

Setting Up Jenkins: http://your_server_ip_or_domain:8080

display the password: sudo cat /var/lib/jenkins/secrets/initialAdminPassword

Copy the 32-character alphanumeric password from the terminal and paste it into the Administrator password field, then click Continue. ... https://www.youtube.com/watch?v=GykBnH00OQU