一个subnet有多个dns server时，dns server在创建时就定好了，但可以update：
neutron subnet-update 1a2d261b-b233-3ab9-902e-88576a82afa6 --dns_nameservers list=true 3.3.3.3 2.2.2.2 1.1.1.1 changzhi@stack:~/devstack$ neutron subnet-show 1a2d261b-b233-3ab9-902e-88576a82afa6 +------------------+--------------------------------------------+ | Field | Value | +------------------+--------------------------------------------+ | allocation_pools | {"start": "10.0.0.2", "end": "10.0.0.254"} | | cidr | 10.0.0.0/24 | | dns_nameservers | 3.3.3.3 | | | 2.2.2.2 | | | 1.1.1.1 | | enable_dhcp | True | | gateway_ip | 10.0.0.1 | | host_routes | | | id | 1a2d26fb-b733-4ab3-992e-88554a87afa6 | | ip_version | 4 | | name | | | network_id | a404518c-800d-2353-9193-57dbb42ac5ee | | tenant_id | 3868290ab10f417390acbb754160dbb2 | +------------------+--------------------------------------------+
http://docs.openstack.org/developer/neutron/devref/dns_order.html
Keep DNS Nameserver Order Consistency In Neutron
原文：http://www.cnblogs.com/allcloud/p/5486249.html