DevOps Classroom notes 27/Jul/2025

Ansible contd

Password less authentication between servers

• Goal
  
• Steps:
  • create a user called as devops and provide sudo permissions to devops (two servers) sudo adduser devops
  • now create a ssh keypair ssh-keygen on node 1 and copy the public key to node2 ssh-copy-id
  • once we do this setup from node1 devops user can login into node2 ssh <node-2-ip>

AWS

• Lets create two ubuntu ec2 instances.
• In AWS we have a default user for ubuntu images ubuntu
• AWS EC2 instances will have password based access disabled.
• Lets enable password access and then perform above steps
  • Modify /etc/ssh/sshd_config.d/60-cloudimg-settings.conf using nano and set password authentication to yes
  • reload daemon & restart sshd
    bash
sudo systemctl daemon-reload
sudo systemctl restart ssh
• Now give full permissions to the devops user sudo visudo and enter the following

devops   ALL=(ALL:ALL) NOPASSWD:ALL

Azure

• Azure allows to set password while creating vms
• Lets create two vms in azure and while creating lets set the devops user