ubuntu20.04——网卡及DNS配置

最新推荐文章于 2025-06-05 09:05:19 发布

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#vim #bash #linux

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该博客介绍了如何在Ubuntu系统中配置网卡和DNS。首先，通过提权到root用户，使用vim编辑网卡配置文件`/etc/netplan/00-installer-config.yaml`，设置IP地址、子网掩码、网关和DNS。然后应用配置并验证连接。接着，修改`/etc/systemd/resolved.conf`文件以设置DNS，并启用并重启`systemd-resolved`服务。最后，通过创建软链接确保DNS设置生效。注意，直接编辑`/etc/resolv.conf`可能会因文件被管理系统覆盖而失效。

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网卡配置

ubuntu@p006:~$ 			# 普通用户
ubuntu@p006:~$ sudo su -			# 提权root
[sudo] password for ubuntu:
(venv) root@p006:~# vim /etc/netplan/00-installer-config.yaml			# 编辑网卡
# This is the network config written by 'subiquity'
network:
  ethernets:
    eno1:
      addresses:
      - 10.12.1.6/21
      gateway4: 10.12.1.254
      nameservers:
        addresses:
        - 114.114.114.114
        search: []
  version: 2

(venv) root@p006:~# netplan apply			# 将当前网络计划配置应用于运行中的系统

DNS配置

(venv) root@p006:/etc# vim /etc/systemd/resolved.conf
DNS=114.114.114.114

(venv) root@p006:/etc# systemctl restart systemd-resolved
(venv) root@p006:/etc# systemctl enable systemd-resolved
(venv) root@p006:/etc# mv /etc/resolv.conf /etc/resolv.conf.bak
(venv) root@p006:/etc# ln -s /run/systemd/resolve/resolv.conf /etc/

(venv) root@p006:/etc# ping baidu.com
PING baidu.com (220.181.38.251) 56(84) bytes of data.
64 bytes from 220.181.38.251 (220.181.38.251): icmp_seq=1 ttl=47 time=15.0 ms

还有一种方法，结果就是重启之后就失效了，内容也还原了，原因就是 /etc/resolv.conf 文件中的第一行写了 “Do not edit”

(venv) root@p006:~# vim /etc/resolv.conf
# This file is managed by man:systemd-resolved(8). Do not edit.
# 
# This is a dynamic resolv.conf file for connecting local clients to the
# internal DNS stub resolver of systemd-resolved. This file lists all
# configured search domains.
#
# Run "resolvectl status" to see details about the uplink DNS servers
# currently in use.
#
# Third party programs must not access this file directly, but only through the
# symlink at /etc/resolv.conf. To manage man:resolv.conf(5) in a different way,
# replace this symlink by a static file or a different symlink.
#
# See man:systemd-resolved.service(8) for details about the supported modes of
# operation for /etc/resolv.conf.

nameserver 127.0.0.53
options edns0 trust-ad
nameserver 114.114.114.114

(venv) root@p006:/etc# systemctl restart systemd-resolved