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