设置DNS服务器

迷南。 2023-10-06 15:52 53阅读 0赞

centos虚拟机，今天在这个虚拟机中用curl查看http消息：

$curl -I http://www.baidu.com

结果提示

curl: (6) Could not resolve host

尝试ping一下 www.baidu.com ，出现提示：ping: www.baidu.com: Name or service not known，查阅资料，原来是该虚拟机未配置DNS服务器的原因。继而又去查询资料，看看DNS服务器如何配置，下面是配置DNS服务器的方法：

1、首先查看当前的网络连接

nmcli connection show

结果显示网络设备为enp0s3  
![在这里插入图片描述][20210104121948450.png]  
2、设置DNS服务器

nmcli con mod enp0s3 ipv4.dns  "114.114.114.114 8.8.8.8"

3、使DNS配置生效

nmcli con up enp0s3

4、查看/etc/resolv.conf文件，看看是否有DNS服务器的配置（原先该文件没有任何信息）

![在这里插入图片描述][2021010412212254.png]  
遇到这种情况用，UUID

[root@bogon ~]# nmcli con mod enp0s3 ipv4.dns  "114.114.114.114 8.8.8.8"
    Error: unknown connection 'enp0s3'.
    [root@bogon ~]# nmcli connection show
    NAME                UUID                                  TYPE      DEVICE 
    Wired connection 3  0f10d725-4d90-32ad-bf1b-d8af80a491fe  ethernet  enp0s3 
    Wired connection 4  94e80a45-432f-3c9a-ae7a-daeb2f98d6d6  ethernet  enp0s8 
    virbr0              44e956a7-4820-4f61-aab5-ac65a95f39af  bridge    virbr0 
    virbr0              6acb7da7-2cca-428e-86cf-9a5888da908c  bridge    --     
    Wired connection 1  cda2ea6f-ffa5-3225-a662-53daf72a3462  ethernet  --     
    Wired connection 2  820bb71d-12e9-4cd9-80f6-3b87361367b0  ethernet  --     
    [root@bogon ~]# nmcli con mod Wired ipv4.dns  "114.114.114.114 8.8.8.8"
    Error: unknown connection 'Wired'.
    [root@bogon ~]# nmcli con mod 3 ipv4.dns  "114.114.114.114 8.8.8.8"
    Error: unknown connection '3'.
    [root@bogon ~]# nmcli con mod 0f10d725-4d90-32ad-bf1b-d8af80a491fe ipv4.dns  "114.114.114.114 8.8.8.8"
    [root@bogon ~]# nmcli con up 0f10d725-4d90-32ad-bf1b-d8af80a491fe
    Connection successfully activated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/5)
    [root@bogon ~]# ping docs.zshu.tech
    PING docs.zshu.tech (10.15.1.11) 56(84) bytes of data.
    64 bytes from bogon (10.15.1.11): icmp_seq=1 ttl=61 time=9.99 ms
    64 bytes from bogon (10.15.1.11): icmp_seq=2 ttl=61 time=10.4 ms
    64 bytes from bogon (10.15.1.11): icmp_seq=3 ttl=61 time=13.7 ms
    64 bytes from bogon (10.15.1.11): icmp_seq=4 ttl=61 time=10.3 ms
    64 bytes from bogon (10.15.1.11): icmp_seq=5 ttl=61 time=10.9 ms
    64 bytes from bogon (10.15.1.11): icmp_seq=6 ttl=61 time=10.7 ms
    64 bytes from bogon (10.15.1.11): icmp_seq=7 ttl=61 time=8.02 ms

[20210104121948450.png]: https://img-blog.csdnimg.cn/20210104121948450.png
[2021010412212254.png]: https://img-blog.csdnimg.cn/2021010412212254.png