dns.resolveSoa(hostname, callback)

• hostname <string>
• callback <Function>
  • err <Error>
  • address <Object>

使用域名系统协议来解析 hostname 的起始规范记录（SOA 记录）。 传给 callback 函数的 address 参数将是具有以下属性的对象：

• nsname
• hostmaster
• serial
• refresh
• retry
• expire
• minttl

{
  nsname: 'ns.example.com',
  hostmaster: 'root.example.com',
  serial: 2013101809,
  refresh: 10000,
  retry: 2400,
  expire: 604800,
  minttl: 3600
}

• hostname <string>
• callback <Function>
  • err <Error>
  • address <Object>

Uses the DNS protocol to resolve a start of authority record (SOA record) for the hostname. The address argument passed to the callback function will be an object with the following properties:

• nsname
• hostmaster
• serial
• refresh
• retry
• expire
• minttl

{
  nsname: 'ns.example.com',
  hostmaster: 'root.example.com',
  serial: 2013101809,
  refresh: 10000,
  retry: 2400,
  expire: 604800,
  minttl: 3600
}