How to set up a SSH key structure

• There is a file containing host keys from remote computers at ~/.ssh/known_hosts
• These host keys are automatically stored during the first (manual) login.
• After installation of a new system at the remote site, the remote site's host key has changed and needs to be deleted from ~/.ssh/known_hosts at the local host. The new key will automatically be stored during the first (manual) login.
• To set up a user key for login without a password (this is also required for remote scripts to scp data to the local site), execute the following commands:
• Log in at remote site and create a key pair, e.g.
  ssh wera@remote.domin
  cd .ssh
  ssh-keygen -t rsa
  [this generates a keypair at ~/.ssh/id_rsa and ~/.ssh/id_rsa.pub]
• Copy the public key to the local site, e.g.
  scp id_rsa.pub wera@local.domin:~/remote.pub
• Log off the remote site.
• At local site, append the remote site's public key to ~/.ssh/authorized_keys, e.g.
  cat remote.pub >> ~/.ssh/authorized_keys