linux怎么修改dns

方法：1、利用“vi /etc/resolv.conf”命令修改dns；2、利用“vi /etc/sysconfig/network-scripts/ifcfg-eth0”命令修改文件内的dns项内容，修改后重启网卡生效。

linux怎么修改dns

本教程操作环境：linux7.3系统、Dell G3电脑。

linux怎么修改dns

方法一、修改/etc/resolv.conf（推荐）

[root@bin ~]# vi /etc/resolv.conf
nameserver 8.8.8.8
nameserver 8.8.4.4

修改后会立即生效，不需做任何额外处理！故，比较推荐此方法。

方法二、修改 /etc/sysconfig/network-scripts/ifcfg-eth0文件

[root@bin ~]# vi /etc/sysconfig/network-scripts/ifcfg-eth0
DEVICE=eth0
ONBOOT=yes
BOOTPROTO=dhcp
DNS2=8.8.4.4
TYPE=Ethernet
DNS1=8.8.8.8
IPV6INIT=no
USERCTL=no
PEERDNS=yes

这种办法还要重启网卡才生效，重启网卡可以用以下命令：

service network restart

查看本机DNS的办法

1、查看/etc/resolv.con文件

[oboth@localhost ~]$ cat /etc/resolv.conf 
nameserver 114.114.114.114
nameserver 8.8.8.8

2、使用nslookup命令查看DNS信息

[oboth@localhost ~]$ nslookup qq.com
Server:        114.114.114.114
Address:    114.114.114.114#53
Name:    qq.com
Address: 123.151.137.18
Name:    qq.com
Address: 61.129.7.47
Name:    qq.com
Address: 183.3.226.35

3、使用dig命令来查看DNS信息

[oboth@localhost ~]$ dig
; <<>> DiG 9.11.25-RedHat-9.11.25-2.fc33 <<>>
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 27276
;; flags: qr rd ra; QUERY: 1, ANSWER: 13, AUTHORITY: 0, ADDITIONAL: 1
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 512
;; QUESTION SECTION:
;.    IN    NS
;; ANSWER SECTION:
.    3359    IN    NS    l.root-servers.net.
.    3359    IN    NS    j.root-servers.net.
.    3359    IN    NS    g.root-servers.net.
.    3359    IN    NS    a.root-servers.net.
.    3359    IN    NS    i.root-servers.net.
.    3359    IN    NS    f.root-servers.net.
.    3359    IN    NS    k.root-servers.net.
.    3359    IN    NS    h.root-servers.net.
.    3359    IN    NS    e.root-servers.net.
.    3359    IN    NS    b.root-servers.net.
.    3359    IN    NS    d.root-servers.net.
.    3359    IN    NS    m.root-servers.net.
.    3359    IN    NS    c.root-servers.net.
;; Query time: 59 msec
;; SERVER: 114.114.114.114#53(114.114.114.114)
;; WHEN: 一 2月 01 18:02:15 CST 2021
;; MSG SIZE rcvd: 239