CentOS配置DNS方法

yum安装软件出现无法安装，排查网络配置确认是否能访问外网，首先ping 8.8.8.8确认可以访问网络，然后ping www.baidu.com确认是否配置DNS解析网址； 如果出现可以ping通ip，但是无法访问网址的情况，说明DNS解析有问题，需要排查配置；

[root@localhost etc]# ping mirrors.tuna.tsinghua.edu.cn ping: mirrors.tuna.tsinghua.edu.cn: Name or service not known

[root@localhost ~]# ping mirrors.tuna.tsinghua.edu.cn PING cdnmirrors.s.tuna.tsinghua.edu.cn (101.6.8.193) 56(84) bytes of data. 64 bytes from 101.6.8.193 (101.6.8.193): icmp_seq=1 ttl=239 time=43.1 ms 64 bytes from 101.6.8.193 (101.6.8.193): icmp_seq=2 ttl=239 time=45.0 ms

一、直接修改文件/etc/sysconfig/network-scripts/ifcfg-xxx

[root@localhost ~]# nmcli connection show 查看配置的网口名称 NAME UUID TYPE DEVICE enp0s31f6 4e827d4e-04d0-4113-849e-1647c693080b 802-3-ethernet enp0s31f6

[root@localhost ~]# cat /etc/sysconfig/network-scripts/ifcfg-enp0s31f6 TYPE=Ethernet BOOTPROTO=none DEFROUTE=yes IPV4_FAILURE_FATAL=no IPV6INIT=yes IPV6_AUTOCONF=yes IPV6_DEFROUTE=yes IPV6_FAILURE_FATAL=no IPV6_ADDR_GEN_MODE=stable-privacy NAME=enp0s31f6 UUID=4e827d4e-04d0-4113-849e-1647c693080b DEVICE=enp0s31f6 ONBOOT=yes IPADDR=192.169.8.199 PREFIX=24 GATEWAY=192.169.8.254 DNS1=114.114.114.114 DNS2=8.8.8.8 IPV6_PEERDNS=yes IPV6_PEERROUTES=yes

二、nmcli命令修改

[root@localhost etc]# nmcli connection modify enp0s31f6 ipv4.dns “114.114.114.114 8.8.8.8” [root@localhost etc]# nmcli connection up enp0s31f6 Connection successfully activated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/4451) [root@localhost etc]# [root@localhost etc]# [root@localhost etc]# cat /etc/sysconfig/network-scripts/ifcfg-enp0s31f6 TYPE=Ethernet BOOTPROTO=none DEFROUTE=yes IPV4_FAILURE_FATAL=no IPV6INIT=yes IPV6_AUTOCONF=yes IPV6_DEFROUTE=yes IPV6_FAILURE_FATAL=no IPV6_ADDR_GEN_MODE=stable-privacy NAME=enp0s31f6 UUID=4e827d4e-04d0-4113-849e-1647c693080b DEVICE=enp0s31f6 ONBOOT=yes IPADDR=192.169.8.199 PREFIX=24 GATEWAY=192.169.8.254 DNS1=114.114.114.114 DNS2=8.8.8.8 IPV6_PEERDNS=yes IPV6_PEERROUTES=yes

三、修改/etc/resolv.conf文件

[root@localhost ~]# vim /etc/NetworkManager/NetworkManager.conf 修改或添加dns=none [main] #plugins=ifcfg-rh,ibft dns=none 保存后重启服务 [root@localhost ~]# systemctl restart NetworkManager.service 然后修改/etc/resolv.conf文件 [root@localhost ~]# vim /etc/resolv.conf #Generated by NetworkManager nameserver 114.114.114.114 nameserver 8.8.8.8 修改后保持即可