linux:Temporary failure in name resolution&Couldn’t resolve host

左手的ㄟ右手 2024-03-24 18:50 99阅读 0赞

所有域名无法正常解析。

>  *  ping [www.baidu.com][] 等域名提示 Temporary failure in name resolution错误。

root@localhost:~# ping www.baidu.com
    ping: www.baidu.com: Temporary failure in name resolution
    root@localhost:~#

## 一、ubuntu/debian（emporary failure in name resolution） ##

#### 1、修改/etc/resolv.conf配置文件 ####

sudo vim /etc/resolv.conf

添加如下内容：nameserver 8.8.8.8  
![6bebe0521bc44e87a91c3cea97087bbb.png][]

然后重新试下，访问正常

root@localhost:~# ping www.baidu.com
    PING www.a.shifen.com (39.156.66.18) 56(84) bytes of data.
    64 bytes from 39.156.66.18 (39.156.66.18): icmp_seq=1 ttl=52 time=21.9 ms
    64 bytes from 39.156.66.18 (39.156.66.18): icmp_seq=2 ttl=52 time=21.8 ms
    64 bytes from 39.156.66.18 (39.156.66.18): icmp_seq=3 ttl=52 time=37.3 ms
    64 bytes from 39.156.66.18 (39.156.66.18): icmp_seq=4 ttl=52 time=23.0 ms
    64 bytes from 39.156.66.18 (39.156.66.18): icmp_seq=5 ttl=52 time=32.4 ms
    64 bytes from 39.156.66.18 (39.156.66.18): icmp_seq=6 ttl=52 time=42.5 ms
    64 bytes from 39.156.66.18 (39.156.66.18): icmp_seq=7 ttl=52 time=22.0 ms
    64 bytes from 39.156.66.18 (39.156.66.18): icmp_seq=8 ttl=52 time=25.9 ms
    64 bytes from 39.156.66.18 (39.156.66.18): icmp_seq=9 ttl=52 time=22.1 ms
    64 bytes from 39.156.66.18 (39.156.66.18): icmp_seq=10 ttl=52 time=42.2 ms
    ^C
    --- www.a.shifen.com ping statistics ---
    10 packets transmitted, 10 received, 0% packet loss, time 28ms
    rtt min/avg/max/mdev = 21.801/29.118/42.487/8.263 ms
    root@localhost:~#

## 二、 CentOS（Couldn’t resolve host） ##

> CentOS 下面直接修改 `/etc/resolv.conf` 不行，因为该文件调用了 `/etc/sysconfig/network-scripts/ifcfg-eth0` 的配置预设，既然知道了这两个文件的工作原理，那么我们必须要在 `/etc/sysconfig/ network-scripts/ifcfg-eth0` 里面最后加上 dns 地址让 `resolv.conf` 来调用。否则重启后，因为 eth0 中没有预设 dns 的相关信息，就会使 `/etc/resolv.conf` 恢复到原来的状态，解析还是不成功。

修改 `/etc/sysconfig/network-scripts/ifcfg-eth0` 文件

最后加上两行

DNS1=8.8.8.8
    DNS2=8.8.4.4

改完后重启网卡

service network restart

重启后再查看 `/etc/resolv.conf` 文件是这样的：

# Generated by NetworkManager
    search webhostbox.net
    nameserver 8.8.8.8

[www.baidu.com]: https://link.jianshu.com/?t=http://www.baidu.com
[6bebe0521bc44e87a91c3cea97087bbb.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/13/ef120e950e5246cc9c7045fc0eb7ba44.png