Install, Run, Stop Jenkins in AWS EC2 Instance (Red Hat 8)

Jenkins is an open-source server capable of Continuous Integration and Continues Deployment (CI/CD). Jenkin is basically a java based application. Jenkins uses a wrapper around Jetty that implements the Winstone command line interface. Here is an example of a shell script that can deploy, run and stop Jenkins on an AWS EC2 instance. Before that there is some information, this script is tested on RED HAT 8 on en EC2 instance.

cat   /etc/*-release
NAME="Red Hat Enterprise Linux"
VERSION="8.0 (Ootpa)"
ID="rhel"
ID_LIKE="fedora"
VERSION_ID="8.0"
PLATFORM_ID="platform:el8"
PRETTY_NAME="Red Hat Enterprise Linux 8.0 (Ootpa)"
ANSI_COLOR="0;31"
CPE_NAME="cpe:/o:redhat:enterprise_linux:8.0:GA"
HOME_URL="https://www.redhat.com/"
BUG_REPORT_URL="https://bugzilla.redhat.com/"

REDHAT_BUGZILLA_PRODUCT="Red Hat Enterprise Linux 8"
REDHAT_BUGZILLA_PRODUCT_VERSION=8.0
REDHAT_SUPPORT_PRODUCT="Red Hat Enterprise Linux"
REDHAT_SUPPORT_PRODUCT_VERSION="8.0"
Red Hat Enterprise Linux release 8.0 (Ootpa)
Red Hat Enterprise Linux release 8.0 (Ootpa)

You need to have java installed in this machine. For example, for this machine following is the java version -

java -version
openjdk version "1.8.0_232"
OpenJDK Runtime Environment (build 1.8.0_232-b09)
OpenJDK 64-Bit Server VM (build 25.232-b09, mixed mode)

Following is the shell script with options to start and stop Jenkins. When you start Jenkins it starts Jetty container. To stop Jenkins you simply have to kill the java process.

#!/bin/bash
  
clear
echo "Enter your choice $0 start|stop :" $1

function help()
{
 echo "Please select an option "
 echo "enter $0 start to start Jenkin"
 echo "enter $0 stop to stop  Jenkin"
}

function startJn()
{
echo "Initializing Jenkins"

java -jar /opt/spark/jenkins/jenkins.war --httpPort=80 &

JenkinPID=$!
echo $jenkinPID

}

function stopJn()

{
echo "Your Java PID is"
pidof java

echo "Process killing initiated"
kill -9  $(pidof java)

}