如何将端口从一个Docker容器转发到另一个? [英] How can I forward a port from one docker container to another?

问题描述

我通常会看到将docker容器的端口暴露给主机的解决方案.

I commonly see solutions that expose a docker container's port to the host.

就我而言，我想将本地端口从一个容器转发到另一个.假设我在容器A 上运行了具有硬编码配置的服务，以访问localhost 3306上的db .但是我想在容器B 上运行数据库服务器.

In my case I want to forward a local port from one container, to another. Let's say I run a service on container A that has a hard-coded configuration to access db on localhost 3306. But I want to run the db server on container B.

将从A-localhost:3306移植到B-IP:3306 的最佳方法是什么?

推荐答案

在容器中以及在启动运行时安装socat

Install socat in your container and at startup run

socat TCP-LISTEN:3306,fork TCP:B-IP:3306 &

这将在您的3306上进行本地侦听，并将任何流量双向传递给B-IP:3306. socat在名为socat的软件包中可用.因此，您将运行以下任何命令来安装它

This will listen locally on your 3306 and pass any traffic bidirectionally to B-IP:3306. socat is available in package named socat. So you will run any of the below commands to install it

$ yum install -y socat
$ apt install -y socat
$ apk add socat

编辑1

您甚至可以通过不触摸原始容器来做到这一点

You can even do this by not touching your original container

Dockerfile

FROM alpine
RUN apk update && apk add socat

按如下所示构建文件

docker build -t socat .

现在从同一个容器运行

docker run --name mysql-bridge-a-to-b --net=container:<containerAid> socat socat TCP-LISTEN:3306,fork TCP:BIP:3306

这将在A的网络上运行此容器.因此，当它在A的网络上侦听时，即使未触摸A容器，localhost:3306也将在A中变为可用.

This will run this container on A's network. So when it listens on A's network the localhost:3306 will become available in A even though A container was not touched.

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