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Deploying Apps into Linux Via Jenkin Plugins

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Nidhi Sharma
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5 min read

Table of contents

Hey Guys,

ALERT:- After practicing this It can cost you Around 30 to 40 USD(Around 2500 to 3000). You can terminate the AWS instance after this or you can close Your Account.

Let's get started, Guys!

Pre-Requisites

Installing JAVA on a Linux machine

Okay, So the first step here will be Installing Java on a Linux machine(EC2 Instance) which we have Created on AWS.

The steps are as follows:-

$ su -c "yum install java-1.8.0-openjdk-devel"

if you are logged in as root and also the location is "~", now use yum install java-1.8.0-openjdk-devel Because we want JRE and JDK.

  • It will ask "Is This Okay", Enter 'y"

  • Use the command to see the Java version --> java -version

  • To remove any program use the command --> yum remove java (Optional)

Setting Java Home Path

As we know where the location of java is, Jenkins or any other software won't know where Java is, So hence we are adding it to system variables with Its path.

  • Use the command ls -a to see all files in directories.

  • You will see .bash profile

  • Use command cat .bash profile to see content

Extra Commands to look into

--> pwd :- For seeing present directory

--> cd .. :- to move one directory back

--> ls:- to see the files in directory

--> cd root :- to get back to root folder

Okay, Back to our commands😁

  • Use command cd usr/lib as java is installed there

  • ls -a

  • cd jvm

  • ls -a

  • Copy the content showing java path (Which maybe has keyword openjdk )

  • again enter cd and that path

  • now do ls-a to see jre is displayed

  • now use command pwd

  • Copy whole path

  • Now again move to .bash profile

Use the below commands to reach back to your original positions

  • enter exit

  • enter sudo su -

Again Going back to edit the .bash profile(VERY IMPORTANT)

  • enter vi .bash profile

  • select i button so that it will be now in insert mode

  • Under User specific environment and startup programs, Enter

    JAVA_HOME=(Paste the path, we copied earlier)

    PATH= :$JAVA_HOME(Take care you have written without removing anything at the last) see image

  • to save the file, use command :

    click esc -> enter :wq

    To exit without saving a file

    click esc -> enter :q!

  • To see if the path is set, the user is on the location .bash profile. Enter cat .bash profile. And users see the entered content.

Installing MAVEN on a Linux machine

we will use wget to install maven --> Wget solely lets you download files from an HTTP/HTTPS or FTP server. You give it a link and it automatically downloads the file where the link points. It helps to download Binaries.

  • Hit the url https://maven.apache.org/download.cgi (you will see a tar.gz link, which is used by linux)

  • Enter wget https://dlcdn.apache.org/maven/maven-3/3.9.0/binaries/apache-maven-3.9.0-bin.tar.gz

  • now go to the url https://maven.apache.org/install.html

  • You will see a command to unzip it in linux

  • Use command tar xzvf apache-maven-3.9.0-bin.tar.gz

  • Make Sure everything you are doing is as root user.

  • It's recommended by Maven to install maven at opt package.

    User is on "/" home location, write the command.

    --> ls -a

  • to copy a folder from one location to another type cp -r apache-maven-3.6.3 /opt (cp -r is copy file recursively)

  • type pwd and copy the path->type exit ->sudo su -

  • type vi .bash profile

  • Write the following in bash profile

    • MAVEN_HOME= (Paste the selected path above)

    • M2= /opt/apache-maven-3.6.3/bin

    • PATH= :$MAVEN_HOME:$M2(Take care you have written without removing anything at the last) see image

    • to save the file, use command :

      click esc -> enter :wq

Install Jenkins on Linux and start the Jenkin server

Write the below code as root user after exiting wherever you were.👇

sudo wget -O /etc/yum.repos.d/jenkins.repo \
    https://pkg.jenkins.io/redhat-stable/jenkins.repo
sudo rpm --import https://pkg.jenkins.io/redhat-stable/jenkins.io.key
sudo yum upgrade
# Add required dependencies for the jenkins package
sudo yum install java-11-openjdk
sudo yum install jenkins
sudo systemctl daemon-reload

  • After this to start jenkins write sudo systemctl start jenkins

    You can refer the page (https://www.jenkins.io/doc/book/installing/linux/#red-hat-centos)

  • Go to the AWS instance

  • Copy the public IP

  • And add :8080 to it and You server will get started 😍

  • go to the Location written for password authentication, and Copy password.

  • Paste the Password on the URL

  • Click Installed suggested Plugins

  • Provide Username and other details->Save and continue

  • Click Save and finish

  • Click Start using jenkins

Create a new Jenkins Job for deploying apps

On the Home page itself

  • Click Create new Job

  • Enter an Item name

  • Select Free style Project

  • Click Okay

Now you are on the deployment/configure page

Under Source code Management

  • Select GIT

  • Under repository URL, copy paste your Project/App URL from github.com

Configuring Jenkins so that it will know directly Your git URL and JAVA And MAVEN Variables

  • Click Manage Jenkins

  • Click Global Tool configuration

  • Add JDK Path (Goto mobaxterm terminal, type clear)

  • Enter echo $JAVA_HOME

  • Also Enter the name

Now for GIT

  • Go to terminal and type Which Git

  • If Git is not there, Install Git

  • Enter Yum Install Git as root user

Now for Maven

  • Under Build Environment

  • Add Build step Invoke top-level Maven targets

  • Write test install under goals which will build your .war file

  • Now Save the Project and Run

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