'Get a single node.
:param      node_id: id of the node that we need the node object for
:type       node_id: ``str``
:rtype: :class:`Node`'

def ex_get_node(self, node_id):

    params = {'mbpkgid': node_id}
    result = self.connection.request((API_ROOT + '/cloud/server'), params=params).object
    node = self._to_node(result)
    return node
