jenkinsInstallation

Install Jenkins on AWS EC2
Jenkins is a self-contained Java-based program, ready to run out-of-the-box, with packages for Windows, Mac OS X and other Unix-like operating systems. As an extensible automation server, Jenkins can be used as a simple CI server or turned into the continuous delivery hub for any project.

Pre req : ec2 with amazon linux (rhel 7.x)
Java 1.8x

Check the path 
#echo $PATH

Become root
#sudo su
#echo $PATH
#yum -y install java-1.8.0-openjdk
#whereis java
set in env variable
java -version
find /usr/lib/jvm/java-1.8* | head -n 3
set in env variable
#vi .bash_profile
  PATH=$PATH:$JAVA_HOME:$HOME/bin
  export JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.amzn2.x86_64/
   :wq!
#source .bash_profile
#echo $PATH
#echo $JAVA_HOME

      output will be like this
      [root@usmanshariff1c ~]# java -version
      openjdk version "1.8.0_191"
      OpenJDK Runtime Environment (build 1.8.0_191-b12)
      OpenJDK 64-Bit Server VM (build 25.191-b12, mixed mode)
      [root@usmanshariff1c ~]# echo $JAVA_HOME  
      /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.amzn2.x86_64/
      [root@usmanshariff1c ~]# echo $PATH
      /sbin:/bin:/usr/sbin:/usr/bin:/usr/local/rvm/bin::/root/bin

Install Jenkins

#yum -y install wget
#wget -O /etc/yum.repos.d/jenkins.repo https://pkg.jenkins.io/redhat-stable/jenkins.repo
#rpm --import https://pkg.jenkins.io/redhat-stable/jenkins.io.key
#yum -y install jenkins

Start Service
# Start jenkins service
systemctl start jenkins

# Setup Jenkins to start at boot,
systemctl enable jenkins

Accessing Jenkins
By default jenkins runs at port 8080, You can access jenkins at

http://YOUR-SERVER-PUBLIC-IP:8080


Configure Jenkins
The default Username is admin
Grab the default password
Password Location:/var/lib/jenkins/secrets/initialAdminPassword
Skip Plugin Installation; We can do it later
Change admin password
Admin > Configure > Password
Configure java path
Manage Jenkins > Global Tool Configuration > JDK
Create another admin user id
Test Jenkins Jobs
Create “new item”
Enter an item name – My-First-Project
Chose Freestyle project
Under Build section Execute shell : echo "Welcome to Jenkins Demo"
Save your job
Build job
Check "console output"