Linux下DNS的修改

今天突然发现Fedora上⽆法联⽹了，分析⼀通发现直连IP是可以通的，所以只是单纯的解析不了域名。那这就好办了，设置下DNS即可解决。⼀般来说修改DNS常见有两种⽅法。

⽅法⼀、修改/etc/resolv.conf（推荐）

[root@bin ~]# vi /etc/resolv.confnameserver 8.8.8.8nameserver 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-eth0DEVICE=eth0ONBOOT=yes

BOOTPROTO=dhcpDNS2=8.8.4.4TYPE=EthernetDNS1=8.8.8.8IPV6INIT=noUSERCTL=noPEERDNS=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 114.114.114.114nameserver 8.8.8.8

2、使⽤nslookup命令查看DNS信息

[oboth@localhost ~]$ nslookup qq.comServer: 114.114.114.114Address: 114.114.114.114#53Name: qq.com

Address: 123.151.137.18Name: qq.com

Address: 61.129.7.47Name: 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