Install Jenkins on Ubuntu 16.04

Introduction

This guide is to install Jenkins on Ubuntu 16.04. Please make sure that your system already was updated and running commands with root privilege.

Installing

Step 1: Install Java OpenJDK 8

sudo apt update
sudo apt install python-software-properties apt-transport-https -y
sudo add-apt-repository ppa:openjdk-r/ppa
sudo apt update
sudo apt install openjdk-8-jdk -y

Verify Java after installing

java -version

The command should be have a result like this:

Step 2: Install Jenkins

Add Jenkins key and repository to the system with the command below.

wget -q -O - https://pkg.jenkins.io/debian-stable/jenkins.io.key | sudo apt-key add -
echo 'deb https://pkg.jenkins.io/debian-stable binary/' | tee -a /etc/apt/sources.list

Update repository and install Jenkins

sudo apt update
sudo apt install jenkins -y

Restart daemon and Jenkins.

systemctl restart jenkins

After running Jenkins then it will be open port 8080. Check it by this command:

netstart -an | grep 8080

Bonus information

• How to open Jenkins with port 80 or 443

TD;TR: Iptables commands is to redirect packets from 80 to 8080 and 443 to 8443

sudo iptables -A PREROUTING -t nat -i eth0 -p tcp --dport 80 -j REDIRECT --to-port 8080
sudo iptables -A PREROUTING -t nat -i eth0 -p tcp --dport 443 -j REDIRECT --to-port 8443

Save Iptables on Ubuntu 16.04

sudo apt install iptables-persistent -y
sudo netfilter-persistent save
sudo netfilter-persistent reload

References

[1] https://www.howtoforge.com/tutorial/how-to-install-jenkins-with-apache-on-ubuntu-16-04/

[2] https://stackoverflow.com/questions/39621263/jenkins-fails-when-running-service-start-jenkins