使用 systemd 在操作系统上为 Docker 守护进程设置 DNS [英] Setting DNS for Docker daemon on OS with systemd

问题描述

Docker 的默认 DNS(例如 8.8.8.8)在我工作的地方被阻止，所以我想更改默认值.我已经能够使用

The default DNS for Docker (e.g. 8.8.8.8) is blocked where I work, so I want to change the default. I've been able to do this using

$ docker daemon --dns <mydnsaddress>

但我想使用 systemd 插件来做到这一点，因为官方 Docker 文档推荐这种方式.我制作了一个 /etc/systemd/system/docker.service.d/dns.conf 文件，并使用了这样的东西:

but I want to do this using a systemd drop-in instead, since the official Docker docs recommend this way. I've made a /etc/systemd/system/docker.service.d/dns.conf file, and used things like this:

[Service]
DNS=<mydnsaddress>

但我只是不知道变量名应该是什么.我该如何设置?更重要的是，是否有一个页面记录了可在 Docker 的 systemd 插件中使用的所有配置变量?

But I just have no idea what the variable name is supposed to be. How do I set this? More importantly, is there a page that documents all config variables that can be used in systemd drop-ins for Docker?

(顺便说一句，这是 Ubuntu 15.10 上的 Docker 1.9，虽然我不怀疑任何错误)

(btw, this is Docker 1.9 on Ubuntu 15.10, although I don't suspect any bugs)

推荐答案

/etc/systemd/system/docker.service.d 中的所有 .conf 文件否决了/usr/lib/systemd/system/docker.service 文件中的设置，这几乎是您尝试过的.

All .conf files in /etc/systemd/system/docker.service.d overrule the settings from the /usr/lib/systemd/system/docker.service file, which is almost what you tried.

您需要从 /usr/lib/systemd/system/中复制 ExecStart= 部分，而不是放入 DNS=.. 行docker.service 文件到 dns.conf(或 mydocker.conf).在 ExecStart 的 daemon 部分之后添加 --dns $ip.例如:

Instead of putting a DNS=.. line in, you need to copy the ExecStart= part from the /usr/lib/systemd/system/docker.service file to dns.conf (or mydocker.conf). Add --dns $ip after the daemon part of the ExecStart. E.g.:

[Service]
ExecStart=
ExecStart=/usr/bin/docker daemon --dns 192.168.1.1 -H fd://

其中192.168.1.1是dns服务器的ip.

Where the 192.168.1.1 is the ip of the dns server.

现在通过 systemctl 重新启动 docker，docker 现在应该使用您自己的 dns 重新启动.(可通过 systemctl status docker.service | grep dns 检查).

Now restart docker via systemctl and docker should now restart with your own dns. (Checkable via systemctl status docker.service | grep dns).

请注意，空的 ExecStart= 是必需的，因为 systemctl 只有先清除 ExecStart 才会否决 ExecStart.

Note that the empty ExecStart= is required, as systemctl only will overrule the ExecStart if it is cleared first.

还要注意在/etc/systemd/system/中编辑文件后需要一个systemctl daemon-reload.

Also note that a systemctl daemon-reload is needed after editing files in /etc/systemd/system/.

最后要说明的是，在某些系统上，docker.service 不在 /usr/lib/systemd/system/ 中，而是在 /lib/systemd 中/system/.

Last remark is that on some systems docker.service is not located in /usr/lib/systemd/system/, but in /lib/systemd/system/.

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