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netcaf's questions

Martin Hope
netcaf
Asked: 2018-03-18 19:49:47 +0800 CST
  • 8

我已阅读有关 systemd-resolved.service https://www.freedesktop.org/software/systemd/man/systemd-resolved.service.html并学习了处理 /etc/resolv.conf 的四种模式。

  1. /run/systemd/resolve/stub-resolv.conf
  2. /usr/lib/systemd/resolv.conf
  3. /run/systemd/resolve/resolv.conf
  4. /etc/resolv.conf 可能由其他包管理

我已经阅读了好几遍，但仍然对如何确定作为普通用户应该选择 /etc/resolv.conf 的哪种模式感到困惑。

例如，我尝试添加一些自定义 dns 服务器，所以，

  1. 在/etc/systemd/resolved.conf 中添加DNS=8.8.8.8 8.8.4.4 并检查/run/systemd/resolve/resolv.conf 中是否存在8.8.8.8 和8.8.4.4。
  2. 如果将 /run/systemd/resolve/resolv.conf 符号链接到 /etc/resolv.conf，则 /run/systemd/resolve/resolv.conf 中将不存在 8.8.8.8 和 8.8.4.4。

更新1：

test@instance-1:~$ cat /run/systemd/resolve/resolv.conf 
...
# See man:systemd-resolved.service(8) for details about the supported modes of
# operation for /etc/resolv.conf.
nameserver 8.8.8.8
nameserver 8.8.4.4

test@instance-1:/etc$ sudo ln -sf /run/systemd/resolve/resolv.conf /etc/resolv.conf 
test@instance-1:/etc$ ls -alh /etc/resolv.conf 
lrwxrwxrwx 1 root root 32 Mar 18 07:22 /etc/resolv.conf -> /run/systemd/resolve/resolv.conf
test@instance-1:/etc$ sudo reboot

test@instance-1:~$ cat /etc/resolv.conf 
domain c.prime-poetry-197705.internal
search c.prime-poetry-197705.internal. google.internal.
nameserver 169.254.169.254

test@instance-1:~$ cat /run/systemd/resolve/resolv.conf 
domain c.prime-poetry-197705.internal
search c.prime-poetry-197705.internal. google.internal.
nameserver 169.254.169.254

test@instance-1:~$ ls -alh /etc/resolv.conf 
lrwxrwxrwx 1 root root 32 Mar 18 07:22 /etc/resolv.conf -> /run/systemd/resolve/resolv.conf

更新 2：来自 /etc/resolv.conf 的符号链接

test@instance-1:~$ sudo ln -sf /etc/resolv.conf /run/systemd/resolve/resolv.conf 
test@instance-1:~$ ls -alh /run/systemd/resolve/resolv.conf 
lrwxrwxrwx 1 root root 16 Mar 18 07:51 /run/systemd/resolve/resolv.conf -> /etc/resolv.conf
test@instance-1:~$ sudo reboot

test@instance-1:~$ ls -alh /run/systemd/resolve/resolv.conf 
-rw-r--r-- 1 systemd-resolve systemd-resolve 603 Mar 18 07:52 /run/systemd/resolve/resolv.conf
systemd systemd-resolved