Jenkins Installation & Simple Job Configuration on Ubuntu

Install Jenkins on ubuntu

Install openjdk8

Execute the following commands in order

sudo apt-get update
sudo apt-cache search openjdk

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Note: Select any suitable package from the top. This documentation selects the openjdk-8-jdk

sudo apt-get install openjdk-8-jdk

Prepare your system for Jenkins in ubuntu

Execute the following commands

wget -q -O - https://pkg.jenkins.io/debian/jenkins-ci.org.key | sudo apt-key add -
echo deb https://pkg.jenkins.io/debian-stable binary/ | sudo tee /etc/apt/sources.list.d/jenkins.list
sudo apt-get update

Before executing install of Jenkins lets try to find the possible Jenkins versions available

sudo apt-cache madison jenkins

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Installing Jenkins

sudo apt-get install jenkins  -y

Jenkins Post-Install Configuration

Navigate to the url http://<jenkinsserverip>:8080
Find the contents of /var/jenkins_home/secrets/initialAdminPassword and enter in the Administrator Password Textbox and click on continue
Now Select the Install Selected plugins in the Customize Jenkins Page
Wait till all the plugin installations become successful and then you will be navigated to Create First Admin User Page. Enter the details and click on save and continue

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After confirming the instance configuration, You should see the Jenkins is ready page
Click on Start using Jenkins Page and you will be redirected to Jenkins home page.

Configure Git, Maven and Build Sample Java Project

SSH into Jenkins server and Ensure Git, Maven are installed.
In this example lets build game of life from here
Click on new Item and select Freestyle project
Enter the necessary info in the Description in General Tab and Click on Source Code Management Tab
Select Git and Enter the Repository URL and click on Build tab
Select Invoke top-level Maven targets after clicking on add build step
Enter package in Goals section and click on save.
Now Select Build Now and you should see the update in Build History section
Click on the Build number as highlighted and select console output to see the build logs