Getting Started With Jenkins-Installation and Setup

Firstly we will fulfill Jenkins’s requirements and then move towards Jenkins installation and then will create a Job, and at the end a must-watch Issues encountered Section. For android project related configuration read 2nd part.

Part 2: Configuring Android Project on Jenkins

Jenkins is a free and open-source automation server. It helps automate the parts of software development related to building, testing, and deploying, facilitating continuous integration and continuous delivery.

1) Jenkins Requirements (if already have, you can skip this part)

Jenkins is Java-based and can be installed from ubuntu packages.

• Java 8 runtime environments, both 32-bit and 64-bit versions are supported, Java 11 runtime environments are also supported
• Older versions of Java are not supported, Java 9, Java 10, Java 12 also not supported

So we need either of these OpenJDK JDK / JRE 8–64 bits or OpenJDK JDK / JRE 11–64 bits

So I decided to go with java 8, Let’s begin with getting requirements sorted first

sudo apt-get install openjdk-8-jre openjdk-8-jdk

now let’s set java Home

echo $JAVA_HOME

if this outputs nothing, we need to set Java Home variable

cd /usr/lib/jvm
cd java-8-openjdk-amd64
pwd

Check if bin folder is there, if yes run below command and copy the path

let’s export and check the path provided

export JAVA_HOME=/usr/lib/jvm/java-8-openjdk-amd64
echo $JAVA_HOME

now we have to set the path variable

export PATH=$PATH:$JAVA_HOME/bin

to set it permanently, open environment file in vi editor

(If familiar with VI Editor -> https://www.guru99.com/the-vi-editor.html)

vi /etc/environment

write this in file at the end -> JAVA_HOME=/usr/lib/jvm/java-8-openjdk-amd64 (depends on your installation)

source /etc/environment

(you can also add the path in your bash rc file if that doesn’t work for you

<sudo vi ~/.bashrc>)

2) Jenkins installation

Firstly Add Jenkins Repository key to the system, it will add key in the apt-key package.

wget -q -O - https://pkg.jenkins.io/debian/jenkins-ci.org.key | sudo apt-key add -

Let’s add binaries now

sudo sh -c 'echo deb http://pkg.jenkins.io/debian-stable binary/ > /etc/apt/sources.list.d/jenkins.list'

Update and get Jenkins

sudo apt-get update
sudo apt-get install jenkins

If It throws unable to start error, as jenkins currently works on java version 8 and 11, you will have to set the correct version. Don’t Worry just run below command.

sudo update-alternatives --config java

Now choose java 8 option from the list given and Rerun Jenkins install command.

Let’s celebrate, It will work Now

Open Web Browser and hit

localhost:8080

If nothing opens, please verify or change port assigned to Jenkins, you can also change it to 8081 or any other by opening the below file in VI editor.

cat /etc/default/jenkins

WOhooo It starts, lets fetch initial password to proceed further , paste and continue

sudo cat /var/lib/jenkins/secrets/initialAdminPassword

paste the password and continue success Screen: choose the suggested plugin option

I choose the first option, to install some suggested plugin

It Will Setup some commonly Used Plugin for you

Set Up user

Create Admin user

Now it will show you your Jenkins host address that is nothing but you localHost

Address to Access Jenkins

Woohoo, It’s ready

3) Creating a Job

Click on New Item, Enter an Item name, choose Freestyle project

Scroll to Bottom, Set Build to Execute shell (as we trying a shell command)

In Description, I Wrote an echo statement

echo "bella ciao"

then apply, your project is ready now, press the Build button, and here is your output

4) Issues Encountered

• Ubuntu Release Support — I was on 19.04 (Disco Dingo) and its support ended, therefore, I was not able to run sudo apt-get update or install JDK. It was showing 404 on fetching update repositories. the found solution here -https://smyl.es/how-to-fix-ubuntudebian-apt-get-404-not-found-package-repository-errors-saucy-raring-quantal-oneiric-natty/

sudo sed -i -e 's|disco|eoan|g' /etc/apt/sources.list

I ran above command to move from 19.04(disco Dingo) to 19.10 (Eoan)

• If the old version of JDK set, we need to change the preference as Jenkins need 8 or 11.(sudo update-alternatives — config java)
• Jenkins Active port (cat /etc/default/jenkins)

For Android Configuration on Jenkins Read :

Part 2: Configuring Android Project on Jenkins

References

1. https://wiki.jenkins.io/display/JENKINS/Installing+Jenkins+on+Ubuntu
2. https://jenkins.io/
3. VI Editor — https://www.guru99.com/the-vi-editor.html