def ssh_login_command(host, port=22):
    """
    Return the SSH shell command that can be used to log in to remote machine
    :param str host: Host to log in to
    :param int port: Port to connect with
    :return str ssh_command: An SSH command
    """
    ssh_command = "ssh root@{} -p {} " \
                  "-oStrictHostKeyChecking=no " \
                  "-oUserKnownHostsFile=/dev/null " \
                  "-oPasswordAuthentication=no".format(host, port)
    return ssh_command