'Attach a compute node as a member to the load balancer.
:param balancer: LoadBalancer which should be used
:type  balancer: :class:`LoadBalancer`
:param node: Node to join to the balancer
:type  node: :class:`Node`
:return: Member after joining the balancer.
:rtype: :class:`Member`'

def balancer_attach_compute_node(self, balancer, node):

    member = Member(id=None, ip=node.public_ips[0], port=balancer.port)
    return self.balancer_attach_member(balancer, member)
