红帽全球峰会3.9. 为 Overcloud 设置一个名称解析服务器（Nameserver）
Overcloud 节点需要一个名称解析服务器来提供 DNS 解析主机名。这个服务器在 Undercloud 的
neutron 子网中定义。使用以下命令设置名称解析服务器：
neutron subnet-list neutron subnet-update [subnet-uuid] --dns-nameserver [nameserver-ip]
$ neutron subnet-list
$ neutron subnet-update [subnet-uuid] --dns-nameserver [nameserver-ip]
查看子网来验证名称解析服务器：
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