Installing

macOS

• Install MacPorts

• Install OpenSSH

    $ sudo port install OpenSSH
  

Set up password-less ssh to remote machines

• Create a key if you don't have ~/.ssh/id_rsa.pub

    $ ssh-keygen -t rsa
  

• Download portable OpenSSH from here if you don't have a ssh-copy-id, then

    $ ssh-copy-id -i ~/.ssh/id_rsa.pub username@remoteserver
  

• Test password-less ssh

    $ssh remoteserver whoami
  

References

• Debian Administration: Password-less logins with OpenSSH