无法连接到在 Windows 上使用 docker-compose 启动的容器的暴露端口 [英] Cannot connect to exposed port of container started with docker-compose on Windows

问题描述

我在访问应通过 docker-compose 向主机公开端口的应用程序时遇到问题.这是一个可重现的示例:

我使用 angular CLI 创建了一个新的 angular 应用程序:

ng 新的 angular-docker

然后我在该目录中创建一个包含以下内容的 Dockerfile:

来自节点:8运行 mkdir -p/usr/src/app工作目录/usr/src/app复制 ./usr/src/应用程序运行 npm 安装曝光 4200CMD ["npm", "开始"]

接下来我在同一个目录下创建一个 docker-compose.yaml 文件:

版本:'3'服务:角度:建造: .容器名称:角度泊坞窗卷:- ./src:/usr/src/app/src端口:- 4200:4200"

然后我跑:

docker-compose up

我等到在 docker-compose 输出中得到以下行

angular-docker |** Angular Live Development Server 正在侦听 localhost: 4200，在 http://localhost:4200/上打开浏览器 **

从 docker inspect angular-docker 我看到端口转发规则已经到位:

<代码>...端口":{4200/tcp":[{"HostIp": "0.0.0.0",主机端口":4200"}]},...

现在，当我尝试在 Chrome 中访问 http://localhost:4200 时，我得到 ERR_EMPTY_RESPONSE.

但是，当我使用 docker exec -it angular-docker bash 猛击容器时，当我 curl localhost:4200 时，我得到了响应.

我的环境:

• 操作系统:Windows 10 专业版 10.0.16299 内部版本 16299
• Docker:18.03.1-ce-win65 (17513)

我认为这可能是防火墙问题.因此，为了调试，我关闭了防火墙应用程序(我使用的是 Kaspersky Internet Security)，但不幸的是.

为什么我不能从暴露的端口访问容器?

netstat -an |findstr ":4200" 返回以下内容:

Proto Local Address Foreign Address StateTCP 0.0.0.0:4200 0.0.0.0:0 监听TCP [::1]:4200 [::]:0 监听

解决方案

你不能在 docker 容器中使用默认的 npm start.

另一种方法是在您的 package.json 中更新该命令以运行 ng serve -H 0.0.0.0 像这样:

"start": "ng serve -H 0.0.0.0"

这个额外的-H 0.0.0.0是用来监听容器中的所有接口.

然后，当您的端口映射正常工作时，您应该将您的站点从主机获取到所需的端口 localhost:4200.

I'm having trouble accessing apps that should expose ports to the host via docker-compose. Here is a reproducible example:

I create a new angular app using the angular CLI:

ng new angular-docker

Then I create a Dockerfile with the following contents in that directory:

FROM node:8

RUN mkdir -p /usr/src/app
WORKDIR /usr/src/app
COPY . /usr/src/app

RUN npm install

EXPOSE 4200

CMD ["npm", "start"]

Next I create a docker-compose.yaml file in the same directory:

version: '3'

services:
  angular:
    build: .
    container_name: angular-docker
    volumes:
      - ./src:/usr/src/app/src
    ports:
      - "4200:4200"

Then I run:

docker-compose up

I wait until I get the following line in the docker-compose output

angular-docker | ** Angular Live Development Server is listening on localhost: 4200, open your browser on http://localhost:4200/ **

From docker inspect angular-docker I see that the port-forwarding rule is in place:

...
"Ports": {
            "4200/tcp": [
                {
                    "HostIp": "0.0.0.0",
                    "HostPort": "4200"
                }
            ]
        },
...

Now, when I try to go to http://localhost:4200 in Chrome, I get ERR_EMPTY_RESPONSE.

However, when I use docker exec -it angular-docker bash to bash into the container, I get a response, when I curl localhost:4200.

My environment:

• OS: Windows 10 Pro Version 10.0.16299 Build 16299
• Docker: 18.03.1-ce-win65 (17513)

I figured that this might be a firewall issue. So for debugging, I closed the firewall application (I'm using Kaspersky Internet Security), with no luck.

Why can I not access the container from the exposed port?

EDIT:

netstat -an | findstr ":4200" returns the following:

Proto  Local Address          Foreign Address        State
TCP    0.0.0.0:4200           0.0.0.0:0              LISTENING
TCP    [::1]:4200             [::]:0                 LISTENING

解决方案

You can't use the default npm start out of the box within a docker container.

One alternative is to update that command in your package.json to run ng serve -H 0.0.0.0 like this:

"start": "ng serve -H 0.0.0.0"

This extra -H 0.0.0.0 is to listen to all the interfaces from the container.

Then as your port mappings are working, you should get your site on the desired port localhost:4200 from the host machine.

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