当我将其设置为在docker容器中运行时，为什么我的应用程序监听端口80而不是端口3000?

问题描述：

我正在尝试什么?

我正在尝试在docker容器中运行我的nodejs应用程序，并希望在该容器之外使用它(通过3000端口的浏览器).

I'm trying to run my nodejs app inside a docker container and want to use it outside of the container(through my browser on port 3000).

DockerFile

FROM node:8
WORKDIR /usr/src/app
COPY package*.json ./
RUN npm install
RUN npm run build
COPY . .
EXPOSE 3000
CMD [ "npm", "start" ]

app.ts(相关部分)

const port = process.env.port || 3000;   
let app = express();
app.listen(port, () => {
    console.log(`Listening on port ${port}!`);
});

我正在运行的

命令

$ docker run --net = host< imgName>

操作系统-> Windows 7

OS --> Windows 7

在Oracle Virtual Box中，我已将网络设置更改为桥接网络.

And in the Oracle Virtual Box I've changed network settings to bridged networks.

命令成功运行，服务器开始在端口80上侦听.我可以通过邮递员，curl，浏览器等从端口80的容器外部访问它.

The command runs successfully and the server starts listening on port 80. And I can access it from outside the container on port 80 through postman,curl,browser,etc.

我在哪里做错了?如何使其能够在端口3000上侦听?如果我没有显式暴露它，它甚至还能在端口上监听吗?

Where I am doing wrong? How can I make it to listen on port 3000? And also how is it even able to listen on port if I haven't exposed it explicitly?

我认为码头工人正在将 port 作为 environment变量传递，并将其设置为80，因为我自己没有传递任何环境变量.

I think the docker is passing port as an environment variable and setting it to 80 as I am not passing any environment variable myself.

请帮助我对 docker 刚起步.

答

仅在您的 Dockerfile 中公开不会为您完成此操作.当您执行 docker run 或使用 docker-example.yaml 执行时，您将需要对其进行映射.

Just exposing in your Dockerfile won't do it for you. You will need to map it when you do docker run or execute using docker-example.yaml.

要实现此目的，您将需要使用 $ docker run -p 3000:3000 .之后，您将不需要使用-net = host ，这应该是端口80上提供该服务的原因.

To achieve that you will need to use $ docker run -p 3000:3000. Following that you won't need to use --net=host that should be the reason why the service is available on port 80.

希望有帮助！

干杯！

当我将其设置为在docker容器中运行时，为什么我的应用程序监听端口80而不是端口3000?

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