DevOps Classroom notes 28/Oct/2026

Ansible:

Ansible is open-source IT tool for automation (Redhat)

Where ansible will be used:

1. configuration managment -> Install, upgrade and manage files and services
2. Application deploymnet -> Deploy code access multiple sites
3. Orchestration: used deploy micro services
4. provisioning: Setup infra (vms, cloud resources)

Key Points:

• Agentless – NO softwares are required to install
• yaml-based- files will be human readable
• pushbased – control machine will connect to nodes directly
• idempotent – we can run twice or more the result will be same.

Install ansible

offical docs for ansible installtion

sudo su - # sudo perrmission to become root user 

sudo adduser ansible # create ansible user 

sudo nano /etc/ssh/sshd_config.d/10-password-login-for-special-user.conf  ## allow user to login ssh with password

Match User ansible
    PasswordAuthentication yes

sudo systemctl restart ssh
sudo systemctl restart sshd
# 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 --version ## Verify ansible server version 

Default paths:

1. inventory -> /etc/ansible/hosts
2. roles -> /etc/ansible/roles
3. /usr/bin/ansible -> binary path
4. /etc/ansible/ansible.cfg -> main configuration file
5. temp – ~/.ansible/temp

Create keypair and copy to ansible user

ssh-keygen 
ssh-copy-id user@ipaddress
ssh-copy-id ansible@localhost

# sudo permissions to user 
sudo visudo

ansible ALL=(ALL:ALL) NOPASSWD:ALL

ssh ansible@ipaddress 
sudo su -

Task

1. setup ansible server and create node install python and create ansible user
2. generate ssh-key in ansible server and copy key node.