域名解析 dns

1、ip映射文件
**vim /etc/hosts

127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
172.25.55.1 server1.example.com
172.25.55.2 server2.example.com
172.25.55.3 server3.example.com
172.25.55.4 server4.example.com
172.25.55.5 server5.example.com
172.25.55.6 server6.example.com

2、dns服务器的指向文件
**/etc/resolv.conf
nameserver  172.25.254.254
**vim /etc/sysconfig/network-scripts/ifcfg-eth0
DNS1=172.25.254.254
PEERDNS=yes|no ###配置文件是否会修改/etc/resolv.conf   no表示不修改