Ansible installation file initial commit

Ansible/Ansible_installation.MD

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+# Ansible Installation
+
+Ansible is an open source automation platform. It is very, very simple to setup and yet powerful. Ansible can help you with configuration management, application deployment, task automation.
+
+### Follow this in **[YouTube](https://www.youtube.com/watch?v=79xFyOc_eEY)
+
+### Prerequisites
+
+1. An AWS EC2 instance 
+
+### Installation steps:
+
+Add a EPEL (Extra Packages for Enterprise Linux)third party repository to get packages for Ansible 
+```sh 
+rpm -Uvh https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm
+```
+
+Install Ansible
+```sh 
+yum install ansible -y 
+```
+
+Check Ansible version 
+
+```sh 
+ansible --version
+```
+
+Create a new user for ansible administration & grant admin access to user (Master and Slave)
+```sh 
+useradd ansadmin
+passwd ansadmin
+# below command addes ansadmin to sudoers file. But strongly recommended to use "visudo" command if you are aware vi or nano editor. 
+echo "ansadmin ALL=(ALL) ALL" >> /etc/sudoers
+```
+
+Using keybased authentication is advised. If you are still at learning stage use password based authentication (Master & Slave)
+```sh 
+# sed command replaces "PasswordAuthentication no to yes" without editing file 
+ sed -ie 's/PasswordAuthentication no/PasswordAuthentication yes/' /etc/ssh/sshd_config
+``` 
+Login as a ansadmin user on master and generate ssh key (Master)
+```sh 
+ssh-keygen
+```
+Copy keys onto all ansible client nodes (Master)
+```sh 
+ssh-copy-id <target-server>
+```
+
+Update target servers information on /etc/ansible/hosts file (Master)
+```sh 
+echo "<target server IP>" > /etc/ansible/hosts
+```
+Run ansible command as ansadmin user it should be successful (Master)
+```sh 
+ansible all -m ping
+```