centos 修改 dns

[BruceOuyang]

• 0、查看当前 dns 信息

  cat /etc/resolv.conf

• 1、查看本地网卡信息

  [root@server ~]# ifconfig
  em1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
      inet 10.0.7.251  netmask 255.255.255.0  broadcast 10.0.7.255
      inet6 fe80::147:3537:2c05:b455  prefixlen 64  scopeid 0x20<link>
      ether a4:bb:6d:51:9f:5e  txqueuelen 1000  (Ethernet)
      RX packets 604649496  bytes 54102905903 (50.3 GiB)
      RX errors 134102  dropped 393389  overruns 0  frame 67051
      TX packets 660832  bytes 59740687 (56.9 MiB)
      TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
      device interrupt 20  memory 0xb1000000-b1020000  

  em1 即为当前网卡，对应网卡配置文件为 ifcfg-em1

• 2、编辑 ifcfg-em1 配置 dns 信息

  vim /etc/sysconfig/network-script/ifcfg-em1
  # 添加一行配置
  DNS1="114.114.114.114"

• 3、重启网络服务

  service network restart

• 4、测试验证（再查看一次当前dns信息）

  cat /etc/resolv.conf