How to install Ansible in RHEL and CentOS using Amazon AWS

Definition: Ansible is a program which deploys applications. It automates software provisioning, configuring management and application deployment.
To install Ansible using AWS you need to follow few steps.

Prerequisites to install ansible: Python, EPEL Repository, Ansible.

Useful commands: # hostnamectl set-hostname (name) To identify master and node you need to give some names to it. Ex: # hostnamectl set-hostname master

Step 1: Change your machine name to identify which is maser and which is node.

# hostnamectl set-hostname master - (For master)

# hostnamectl set-hostname node - (For node)

Step 2: Now go to master ssh connection to do so you need to give his command

# cd .ssh

Step 3: You need to generate key in master by giving command

# ssh-keygen

Step 4:  Now to visit generated key go to id_rsa.pub

# cat id_rsa.pub

Step 5: Now go to node machine and open same ssh and edit authorized key.

IN node go to # cd .ssh

 And give # vi authorized_keys

Step 6: Now paste the master's key in node authorized keys and save it with :wq.

Step 7: In node you need to edit sshd file and start ssh service

To Edit ssh files
# vi /etc/ssh/sshd_config

Then edit permitrootlogin to yes to do this you need to
untag '#' symbol for PermitRootLogin
untag '#' symbol for PasswordAuthentication
tag '#' symbol for PasswordAuthentication in next second line
exit with :wq

To Start ssh give # service sshd start

Step 8: Now install Ansible in your master server by

# yum install ansible -y

Step 9: Install EPEL Repository in your master machine if you would like to see how to install EPEL repo check [HERE]

# wget http://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm

Step 10: Go to ansible in master

# cd /etc/ansible

Step 11: Go to Hosts to edit with our node ip address

#vi hosts
 and add IP address of your node and exit

Step 12: Now you can ping your node from master by command

# ansible -m ping all

Step 13: Now you need to write a playbook with .yml format

# vi myplaybook.yml

Setp 14: Basic ansible Playbook for installing java in node

---
 - hosts: app
   tasks:
     - name: install java
       yum: name=java state=installed

save it.

Step 15: To run playbook you need to give

# ansible-playbook (playbookname.yml)

Ex: ansible-playbook myplaybook.yml

To watch clearly the above commands please check below youtube video which is done with the same commands.

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