Jenkins installation initial commit

this document helps to install jenkins on EC2 instance

Author: ValaxyTech

Jenkins/Installation.MD

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+# 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.
+
+### Follow this article in **[Youtube](https://youtu.be/-0dkiteJEuE)**
+
+### Prerequisites
+1. EC2 RHEL 7.x Instance [Get help here](https://www.youtube.com/watch?v=KDtS6BzJo3A)
+   - With Internet Access
+   - Security Group with Port `8080` open for internet
+1. Java v1.8.x 
+
+## Install Java
+We will be using open java for our demo, Get latest version from http://openjdk.java.net/install/
+```sh
+yum install java-1.8*
+#yum -y install java-1.8.0-openjdk
+```
+
+### Confirm Java Version
+Lets install java and set the java home
+```sh
+java -version
+find /usr/lib/jvm/java-1.8* | head -n 3
+#JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-1.el7_6.x86_64
+export JAVA_HOME
+PATH=$PATH:$JAVA_HOME
+# To set it permanently update your .bash_profile
+source ~/.bash_profile
+```
+_The output should be something like this,_
+```
+[root@~]# java -version
+openjdk version "1.8.0_151"
+OpenJDK Runtime Environment (build 1.8.0_151-b12)
+OpenJDK 64-Bit Server VM (build 25.151-b12, mixed mode)
+```
+
+## Install Jenkins
+You can install jenkins using the rpm or by setting up the repo. We will setup the repo so that we can update it easily in future.
+Get latest version of jenkins from https://pkg.jenkins.io/redhat-stable/
+```sh
+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 Jenkins
+```sh
+# 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
+```sh
+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
+1. Create “new item”
+1. Enter an item name – `My-First-Project`
+   - Chose `Freestyle` project
+1. Under Build section
+	Execute shell : echo "Welcome to Jenkins Demo"
+1. Save your job 
+1. Build job
+1. Check "console output"
+
+### Next Step
+- [x] [Configure Users & Groups in Jenkins](https://youtu.be/jZOqcB32dYM)
+- [x] [Secure your Jenkins Server](https://youtu.be/19FmJumnkDc)
+- [x] [Jenkins Plugin Installation](https://youtu.be/p_PqPBbjaZ4)
+- [x] [Jenkins Master-Slave Configuration](https://youtu.be/hwrYURP4O2k)
+- [ ] Setup Jenkins to run inside Tomcat Server