title: Remove key pair from running EC2 instance
body: <p>I lost my .pem file due to which I am not able to login to my ec2 instance. Luckily I had my machine key added to the auth_keys file, so I am able to login using it. I removed the master pub key from the auth_keys file and restarted sshd service. But my colleague who is having the master.pem key file is still able to login to the instance. Am I missing something to disable the complete access to the instance using the master.pem file.
  Please advice.</p>
  
  <p>Thanks </p>