code: def _setSSH(self):
          
          if not os.path.exists('/root/.sshSuccess'):
              subprocess.check_call(['ssh-keygen', '-f', '/root/.ssh/id_rsa', '-t', 'rsa', '-N', ''])
              with open('/root/.sshSuccess', 'w') as f:
                  f.write('written here because of restrictive permissions on .ssh dir')
          os.chmod('/root/.ssh', 0o700)
          subprocess.check_call(['bash', '-c', 'eval $(ssh-agent) && ssh-add -k'])
          with open('/root/.ssh/id_rsa.pub') as f:
              masterPublicKey = f.read()
          masterPublicKey = masterPublicKey.split(' ')[1]  # take 'body' of key
          # confirm it really is an RSA public key
          assert masterPublicKey.startswith('AAAAB3NzaC1yc2E'), masterPublicKey
          return masterPublicKey
docs: Generate a key pair, save it in /root/.ssh/id_rsa.pub, and return the public key.
          The file /root/.sshSuccess is used to prevent this operation from running twice.
          :return Public key.