Ansible Installation & Configuration

Prerequisites:

• Ansible control server has to be installed on Linux server (I used Ubuntu)
• Minimum one node with  Linux OS
• Control Server and node should be reachable on network

Setup

Once basic Ubuntu OS installation is done and able to ssh to server and node need to login to server and set root user

STEP1: Admin user for ansible

sudo -i
adduser ansible

STEP:2 Change key based authentication to support password based authentication

nano /etc/ssh/sshd_config
# change passwordAuthentication from no to yes & save the file
service sshd restart

STEP3: Making ansible user admin

sudo visudo
# scroll to the line where you see %sudo or wheel
# and add the below line
ansible ALL=(ALL:ALL) NOPASSWD:ALL
:wq

STEP4: Install Python & Ansible

##To configure the PPA on your machine and install ansible run these commands:
$ sudo apt update
$ sudo apt install software-properties-common
$ sudo apt-add-repository --yes --update ppa:ansible/ansible	
$ sudo apt install python

Repeat the steps from step1 to step 4 on Ansible node 

STEP5: Install Ansible

$ sudo apt install ansible

STEP6: Inventory

System Level Inventory:

/etc/ansible created during ansible installation

/etc/ansible/hosts => default inventory

#need to add the node IP or host name to hosts file on server
sudo vi /etc/ansible/hosts
localhost
node-IP
:wq

STEP7: Configure nodes for ansible access

Give no password access

Create a key pair

master01:~$ cd .ssh/

ssh-keygen

copy public key to nodes

ssh-copy-id ansible@<node-ip>

Ansible ping command to validate the connectivity between server and node

ansible -m ping all