在 docker 容器中运行时，nodejs 应用程序未连接到 localhost [英] nodejs app doesn't connect to localhost when running within a docker container

问题描述

My environment:
Ubunut 17.04 LTS
npm --version: 5.6.0
nodejs --version: 4.7.2
angular cli version: 1.6.4

docker-compose 文件:

docker-compose file:

version: '3'

services:
 my-app:
    build:
      context: .
      dockerfile: Dockerfile
    restart: unless-stopped
    volumes:
      - .:/usr/src/app
    ports:
      - "4200:4200"

我在 dockerfile 中注释掉了 EXPOSE 4200，因为我已经从 docker-compose.yml 文件中挂载了它，这不行吗，我应该在 dockerfile 中公开并在 docker-compose 中挂载吗?

I commented out the EXPOSE 4200 in dockerfile because I'm already mounting it from docker-compose.yml file, is that NOT ok, should I expose in dockerfile and mount in docker-compose?

在命令行上运行 npm start 会在浏览器上成功启动应用程序，因为我可以转到 localhost:4200 并查看应用程序正在运行.

Running npm start on command line launches the app successfully on the browser as I'm able to go to localhost:4200 and see the app running.

但是，如果我使用 docker 构建我的应用程序并运行 docker-compose up，我看到 nodejs 服务器仍在 localhost:4200 上运行，但是，我无法访问该应用程序，转到 localhost:4200 没有调出页面.

However, if I build my app with docker and run docker-compose up, I see that nodejs server is still running on localhost:4200, however, I CANNOT access the app, going to localhost:4200 doesn't bring up the page.

手动运行应用程序效果很好，我可以在浏览器上看到它:

ubuntu17@ubuntu17:~/playground/apps/myapp-ui$ ng serve
** NG Live Development Server is listening on localhost:4200, open your browser on http://localhost:4200/ **
Date: 2018-01-16T16:22:51.912Z                                                          
Hash: 40ac2bd0588ee2136d15
Time: 13963ms
chunk {inline} inline.bundle.js (inline) 5.79 kB [entry] [rendered]
chunk {main} main.bundle.js (main) 275 kB [initial] [rendered]
chunk {polyfills} polyfills.bundle.js (polyfills) 559 kB [initial] [rendered]
chunk {styles} styles.bundle.js (styles) 514 kB [initial] [rendered]
chunk {vendor} vendor.bundle.js (vendor) 12.1 MB [initial] [rendered]

webpack: Compiled successfully.

从 Docker-COMPOSE 运行应用程序运行良好，但我在 localhost:4200 的浏览器上看不到应用程序

从 docker-compose up

And from docker-compose up

ubuntu17@ubuntu17:~/playground/apps/my-app-ui$ docker-compose up 
Creating network "my-app_default" with the default driver
Creating my-app_my-app_1 ... done
Attaching to my-app_my-app_1
my-app_1  | ** NG Live Development Server is listening on localhost:4200, open your browser on http://localhost:4200/ **
my-app_1  | Date: 2018-01-16T16:28:05.444Z
my-app_1  | Hash: 40ac2bd0588ee2136d15
my-app_1  | Time: 13584ms
my-app_1  | chunk {inline} inline.bundle.js (inline) 5.79 kB [entry] [rendered]
my-app_1  | chunk {main} main.bundle.js (main) 271 kB [initial] [rendered]
my-app_1  | chunk {polyfills} polyfills.bundle.js (polyfills) 549 kB [initial] [rendered]
my-app_1  | chunk {styles} styles.bundle.js (styles) 511 kB [initial] [rendered]
my-app_1  | chunk {vendor} vendor.bundle.js (vendor) 12.1 MB [initial] [rendered]
my-app_1  | 
my-app_1  | webpack: Compiled successfully.

推荐答案

好的，正如您在问题中所说，您的进程正在侦听 localhost:4200 上的连接.

Ok, as you say in your question, your process is listening to connection on localhost:4200.

在一个docker容器内，localhost是容器本身的loopback设备的地址，与你的宿主网络是分开的，无法访问的.

Inside a docker container, localhost is the address of the loopback device of the container itself, which is separated and not reachable from your host network.

您需要编辑您的节点进程，以便通过编辑 Dockerfile 中的入口点使其监听所有地址，如下所示:

You need to edit your node process in order to make it listen to all addresses by editing the entrypoint in your Dockerfile as follows:

ENTRYPOINT ["ng", "serve", "-H", "0.0.0.0"]

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