無法連接到主機的（顯示，發佈）端口

Question

我正在通過React.js的教程，並且我決定在Docker容器中工作。 Here是本教程的代碼。

本教程使用在容器上的端口8080上運行的webpack-dev-server。我在我的Dockerfile中公開了這個端口，並且我用-P運行了我的容器來發布端口。在容器內部，如果我wget http://localhost:8080，它按預期下載index.html。但是，如果我從主機運行等效的PowerShell命令Invoke-WebRequest http://localhost:32769，則會得到Invoke-WebRequest : The underlying connection was closed: The connection was closed unexpectedly.以下全部詳細信息/重新生成步驟。

Dockerfile

FROM node 
MAINTAINER Matthew Pirocchi <matthew.pirocchi@gmail.com> 
RUN apt-get update && apt-get install -y vim 
EXPOSE 8080 

集裝箱設置

docker run -itdP --name repro mpiroc/react-fundamentals 
docker exec -it repro bash 
# Following commands executed within container 
mkdir -p /home/mpiroc/repos && cd /home/mpiroc/repos 
git clone https://github.com/ReactjsProgram/React-Fundamentals.git 
cd React-Fundamentals 
git checkout video2 
npm install 
npm run start # start just runs `webpack-dev-server` 

測試容器

# In a separate terminal 
PS C:\Users\matth> docker exec -it repro bash 
root@fd6c3102bc51:/# wget http://localhost:8080 
... # index.html is downloaded as expected 
root@fd6c3102bc51:/# exit 
exit 
PS C:\Users\matth> docker ps 
CONTAINER ID  IMAGE      COMMAND    CREATED    STATUS    PORTS      NAMES 
fd6c3102bc51  mpiroc/react-fundamentals "node"    28 minutes ago  Up 28 minutes  0.0.0.0:32769->8080/tcp repro 
PS C:\Users\matth> Invoke-WebRequest http://localhost:32769 
Invoke-WebRequest : The underlying connection was closed: The connection was closed unexpectedly. 
At line:1 char:1 
+ Invoke-WebRequest http://localhost:32769 
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 
    + CategoryInfo   : InvalidOperation: (System.Net.HttpWebRequest:HttpWebRequest) [Invoke-WebRequest], WebException 
    + FullyQualifiedErrorId : WebCmdletWebResponseException,Microsoft.PowerShell.Commands.InvokeWebRequestCommand 

爲什麼我無法從我的主機訪問發佈的端口？

Answer 1

我在this question找到答案。我需要改變我的npm run start命令來自：僅偵聽localhost，而不是機器的（在容器

"start": "webpack-dev-server" 

到

"start": "webpack-dev-server --host 0.0.0.0" 

這是因爲在webpack-dev-server 1.8.0及以上，在默認情況下webpack-dev-server這種情況下）ip。

Answer 2

看起來像您在Docker for Windows上運行。如果您使用docker-machine安裝，則執行docker-machine ip default（您可能需要使用docker-machine ls並使用特定的節點名稱而不是默認值）。然後連接到該IP地址以覆蓋Docker運行的Linux VM，而不是本地主機。所以，如果你得到：

docker-machine ip default 
192.168.100.1 

Invoke-WebRequest http://192.168.100.1:32769 
....