DevOps Classroom notes 27/Feb/2025

Ansible Setup

Overview
Pre-reqs:
- Servers should be reachable from Ansible control node
- Servers should have python3 installed
Steps:
- Create a user devops and give this user sudo permissions
- Install Ansible on the control node
- Test the setup

SSH (Secure Shell) is protocol used to login into linux instances which on a broader note supports two types
- password based authentication
- key based authentication
Windows earlier didn’t had inbuild ssh clients now on all latest distributions from windows 11, ssh clients are part of windows
SSH Command For password based ssh <username>@<ip/name-server>

Both distributions will be ubuntu 24.04.
This installation will be going on the linux machines with password enabled
Creating linux machine on Azure (Watch classroom recording) or Refer Here
Created two ubuntu vms ansible-control-node and node- in the same network with os ubuntu-24.04 and username devops
Lets create inventory, create a new file on ansible control node hosts with node-1 s private ip
Now lets install ansible on ubuntu

sudo apt update
sudo apt install software-properties-common
sudo add-apt-repository --yes --update ppa:ansible/ansible
sudo apt install ansible -y

Ansible ping will verify if the ansible control node to node configuration is done correctly or not
This also requires inventory
The command is ansible -m ping -i hosts all, This command expects the credentials to be keys
Ensure you perform a manual ssh into node from control node as it generates an entry in known_hosts file which is used by ansible for password based authenticates
Since we are using password based our command would be ansible -m ping -k -i hosts all