How to modify dns in linux

Method: 1. Use the "vi /etc/resolv.conf" command to modify the dns; 2. Use the "vi /etc/sysconfig/network-scripts/ifcfg-eth0" command to modify the dns entry content in the file , restart the network card after modification to take effect.

#The operating environment of this tutorial: linux7.3 system, Dell G3 computer.

How to modify dns in Linux

Method 1. Modify /etc/resolv.conf (recommended)

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

The modification will take effect immediately, no need Do any additional processing! Therefore, this method is more recommended.

Method 2. Modify the /etc/sysconfig/network-scripts/ifcfg-eth0 file

[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

This method requires restarting the network card to take effect. Restarting the network card can be used. The following command:

service network restart

How to check the local DNS

1. Check the /etc/resolv.con file

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

2. Use the nslookup command View DNS information

[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. Use the dig command to view DNS information

[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

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