def lock_online(self, comment=None):
        """
        Executes a Lock-Online operation on the specified node

        :param str comment: comment for audit
        :raises NodeCommandFailed: cannot lock online
        :return: None
        """
        self.make_request(
            NodeCommandFailed,
            method='update',
            resource='lock_online',
            params={'comment': comment})
Executes a Lock-Online operation on the specified node

        :param str comment: comment for audit
        :raises NodeCommandFailed: cannot lock online
        :return: None