Ubuntu 20.04设置DNS解析（解决resolve.conf被覆盖问题）

2024-04-10 21:26| 来源: 网络整理| 查看: 265

众所周知：

Ubuntu在域名解析时，最直接使用的是/etc/resolve.conf文件，它是/run/systemd/resolve/

resolve.conf的软链接，而对于刚装完的ubuntu系统，该文件的内容如下：

# 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

问题分析：

很显然，我们需要做的就是在/etc/resolve.conf中，配置我们需要的域名解析服务器地址，例如：“nameserver 8.8.8.8”，但是这个文件即使我们修改了，很快又会被覆盖，而且我们注意一个细节——文件的开头就注明了“Do not edit”，到了这里，我们就应该反应过来，直接修改/etc/resolve.conf是不正确的。

解决方案：

第1步，修改/etc/systemd/resolved.conf，例如：

# This file is part of systemd. # # systemd is free software; you can redistribute it and/or modify it # under the terms of the GNU Lesser General Public License as published by # the Free Software Foundation; either version 2.1 of the License, or # (at your option) any later version. # # Entries in this file show the compile time defaults. # You can change settings by editing this file. # Defaults can be restored by simply deleting this file. # # See resolved.conf(5) for details [Resolve] DNS=8.8.8.8 114.114.114.114 #FallbackDNS= #Domains= #LLMNR=no #MulticastDNS=no #DNSSEC=no #DNSOverTLS=no #Cache=no-negative #DNSStubListener=yes #ReadEtcHosts=yes

个人猜测，这个时候，系统在往/run/systemd/resolve/resolv.conf里面写域名解析服务器地址的时候，会从/etc/systemd/resolved.conf中取得DNS相关的配置。

2，重启域名解析服务

systemctl restart systemd-resolved systemctl enable systemd-resolved

3，备份当前的/etc/resolve.conf，并重新设置/run/systemd/resolve/resolv.conf 到/etc/resolve.conf的软链接

mv /etc/resolv.conf /etc/resolv.conf.bak ln -s /run/systemd/resolve/resolv.conf /etc/

验证成果：

# This file is managed by man:systemd-resolved(8). Do not edit. # # This is a dynamic resolv.conf file for connecting local clients directly to # all known uplink DNS servers. This file lists all configured search domains. # # 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 8.8.8.8 nameserver 114.114.114.114

感谢各个论坛大佬的分享，主要参考：

https://www.cnblogs.com/mouseleo/p/14976527.html

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