要通过名称访问我网络上的其他机器，我必须在我的文件中添加以下两行/etc/resolv.conf：
search foo.local
nameserver 192.168.X.Y
但我所做的任何更改在重启后都不会保留。
这是我的 的内容/etc/resolv.conf，它实际上是 的符号链接/run/systemd/resolve/stub-resolv.conf：
$ cat /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 "systemd-resolve --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
我阅读了上述手册以及ArchWiki 上的 systemd-resolved，但我不知道需要做什么。
这是 Ubuntu 18.04 VM（在 Ubuntu 18.04 主机上）。
$ systemd-resolve --status
Global
DNSSEC NTA: 10.in-addr.arpa
16.172.in-addr.arpa
168.192.in-addr.arpa
17.172.in-addr.arpa
18.172.in-addr.arpa
19.172.in-addr.arpa
20.172.in-addr.arpa
21.172.in-addr.arpa
22.172.in-addr.arpa
23.172.in-addr.arpa
24.172.in-addr.arpa
25.172.in-addr.arpa
26.172.in-addr.arpa
27.172.in-addr.arpa
28.172.in-addr.arpa
29.172.in-addr.arpa
30.172.in-addr.arpa
31.172.in-addr.arpa
corp
d.f.ip6.arpa
home
internal
intranet
lan
local
private
test
Link 2 (ens2)
Current Scopes: DNS
LLMNR setting: yes
MulticastDNS setting: no
DNSSEC setting: no
DNSSEC supported: no
DNS Servers: 192.168.122.1
答案1
如果您使用的是 systemd-resolved 而不是 NetworkManager，请将以下行添加到最开始/etc/resolv.conf.head：
/etc/resolv.conf.head
名称服务器 127.0.0.1
通过在以下部分 下添加以下行，防止 NetworkManager 修改/etc/resolv.conf并将所有内容留给 systemd-resolved[main]/etc/NetworkManager/NetworkManager.conf
/etc/NetworkManager/NetworkManager.conf
dns=无
最后一步，您必须重新启动systemd-resolved。
主机> sudo systemctl stop systemd-resolved 主机> sudo systemctl start systemd-resolved
完成后，您可以验证新的 DNS 设置是否有效：
主机> systemd-resolve --status
答案2
使用resolvectl命令。具体来说，dns和domain子命令可分别用于设置nameserver和search域。
resolvectl dns eth0 8.8.8.8 8.8.4.4
resolvectl domain eth0 my.domain.com
resolvectl单独使用可显示当前 DNS 配置。
$ resolvectl
Link 2 (eth0)
Current DNS Server: <main dns ip>
DNS Servers: <list of extra dns ips>
DNS Domain: <list of search domains>