Ubuntu 12.10 DNS 配备

Ubuntu 12.10 DNS 配置

首先不推荐修改/etc/resolv.conf或者修改/etc/resolvconf/resolv.conf.d/目录下的head，base文件，添加tail文件的方法也不赞成。

因为resolv.conf和head文件中都有提醒文字：

cat /etc/resolv.conf 
# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
#     DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN

cat /etc/resolvconf/resolv.conf.d/head
# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
#     DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN

不要对这个视若无睹。以为即便你当时改对了，网络服务一重启，又不行了。

用man resolvconf命令查看文档，可以看到一段提醒注意的文字：

N.B.: On a machine where resolvconf has just been or is about to be installed and which previously relied on a static /etc/resolv.conf file, the nameserver  informa‐
       tion in that static file should be migrated to the appropriate iface stanza(s) in interfaces(5).

证明了的确不推荐修改上面的文件，而建议修改/etc/network/interfaces文件。下面是个正确的例子：

# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
auto eth0
iface eth0 inet static
      address 10.112.18.106
      network 10.112.18.0
      netmask 255.255.255.0
      broadcast 10.112.18.255
      gateway 10.112.18.254
      dns-nameservers 10.112.18.1

就是最后一行dns-nameservers，可以添加多个，用空格分开

上面我用的是静态IP地址，很多时候需要使用DHCP动态分配IP, 这个时候dns-nameservers仍然能够使用，不过优先级比DHCP提供的dns要低。可以改变这个优先级，通过修改/etc/resolvconf/interface-order配置文件。

现在用nslookup来查找dns，一切正常：

nslookup google.com
Server:		10.112.18.1
Address:	10.112.18.1#53

Non-authoritative answer:
Name:	google.com
Address: 74.125.224.229
Name:	google.com
Address: 74.125.224.224
Name:	google.com
Address: 74.125.224.238
Name:	google.com
Address: 74.125.224.230
Name:	google.com
Address: 74.125.224.232
Name:	google.com
Address: 74.125.224.227
Name:	google.com
Address: 74.125.224.233
Name:	google.com
Address: 74.125.224.231
Name:	google.com
Address: 74.125.224.225
Name:	google.com
Address: 74.125.224.226
Name:	google.com
Address: 74.125.224.228

Ubuntu 12.10 DNS 配备

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