从同样位于 boot2docker vm 内的 Docker 容器访问主机作为 localhost [英] Accessing host machine as localhost from a Docker container that's also inside a boot2docker vm

问题描述

假设我有一台服务器在 OSX 的 8000 端口上运行.我的 Docker 容器如何通过 localhost:8000 访问它?我也无法更改主机名，因为容器中的应用不在我的控制之下.

我已经阅读了之前关于使用 --net="host" 的容器访问主机网络的讨论.但是，我在 OSX 上并且 Docker 在 VM 内运行，因此 localhost 从带有 --net="host" 的 Docker 容器转到 VM 而不是我的真机.

然后我尝试了端口转发解决方法，如下所示:VBoxManage modifyvm "boot2docker-vm" --natpf1 "tcp-port8000,tcp,,8000,,8000"; 无济于事.

任何建议将不胜感激.

解决方案

感谢 palimpestor 的回答，我想通了:

代替 --net="host"，使用 --add-host="localhost:10.0.2.2"

确实:

• 10.0.2.2 是为 NAT 模式下的访客网络接口定义的默认网关(参考).
  阅读:这是你的主机，从 boot2docker 看到.
• --add-host... 正在/etc/hosts 中添加 localhost 10.0.2.2 (reference)

注意:您需要在 boot2docker VM VirtualBox 设置中设置一个 NAT 适配器(我是通过 GUI 完成的，不知道 CLI).

Suppose I have a server running on port 8000 on OSX. How can my Docker container access it via localhost:8000? I can't change the hostname too as the app in the container is not in my control.

I've read this previous discussion on using --net="host" for a container to access the host machine's network. However, I'm on OSX and Docker runs inside a VM so localhost from the Docker container with --net="host" goes to the VM and not my real machine.

Then I tried port forwarding workaround like so: VBoxManage modifyvm "boot2docker-vm" --natpf1 "tcp-port8000,tcp,,8000,,8000"; to no avail.

Any suggestion would be greatly appreciated.

解决方案

Thanks to palimpestor's answer I figured it out:

Instead of --net="host", use --add-host="localhost:10.0.2.2"

Indeed:

• 10.0.2.2 is the default gateway defined for the guest network interface in NAT mode (reference).
  Read: it's your host, seen from boot2docker.
• --add-host... is adding localhost 10.0.2.2 in /etc/hosts (reference)

Note: you need to have set up a NAT adapter in your boot2docker VM VirtualBox settings (I did it through the GUI, don't know the CLI).

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