我在docker容器中有一个简单的hello world express.js应用程序.它设置为在端口8080上运行,并且docker文件在映像中公开此端口.另外,我在运行图像时发布了端口.然而,当我尝试做一个简单的curl请求时,连接被拒绝.以下是我设置此测试的方法：

我的Dockerfile非常简单：

FROM node

ADD ./src /src
WORKDIR /src

# install your application's dependencies
RUN npm install

# replace this with your application's default port
EXPOSE 8080

# replace this with your main "server" script file
CMD [ "node","server.js" ]

在我的./src目录中,我有一个如下所示的server.js文件：

var express = require('express');
var app = express();

app.get('/',function(req,res){
  res.send('Hello World');
});

var server = app.listen(8080,function() {
    console.log('Listening on port %d',server.address().port);
});

以及一个基本的package.json,它看起来像这样：

{
  "name": "hello-world","description": "hello world test app","version": "0.0.1","private": true,"dependencies": {
    "express": "4.7.2"
  }
}

图像构建得很好：

→ docker build -t jimjeffers/hello-world .
Sending build context to Docker daemon 1.126 MB
Sending build context to Docker daemon 
Step 0 : FROM node
 ---> 6a8a9894567d
Step 1 : ADD ./src /src
 ---> 753466503fbf
Removing intermediate container 135dab70dfff
Step 2 : WORKDIR /src
 ---> Running in 12257ff3f990
 ---> 010ce4140cdc
Removing intermediate container 12257ff3f990
Step 3 : RUN npm install
 ---> Running in 1a9a0eb9d188
 ---> 5dc97c79281e
Removing intermediate container 1a9a0eb9d188
Step 4 : EXPOSE 8080
 ---> Running in abbaadf8709d
 ---> 9ed540098ed2
Removing intermediate container abbaadf8709d
Step 5 : CMD [ "node","server.js" ]
 ---> Running in 63b14b5581cd
 ---> eababd51b50e
Removing intermediate container 63b14b5581cd
Successfully built eababd51b50e

并开始很好：

→ docker run -P -d jimjeffers/hello-world
ee5024d16a679c10131d23c1c336c163e9a6f4c4ebed94ad4d2a5a66a64bde1d

→ docker ps
CONTAINER ID        IMAGE                           COMMAND                CREATED             STATUS              PORTS                     NAMES
ee5024d16a67        jimjeffers/hello-world:latest   node server.js         About an hour ago   Up 11 seconds       0.0.0.0:49158->8080/tcp   jovial_engelbart    
5d43b2dee28d        mongo:2.6                       /usr/src/mongo/docke   5 hours ago         Up 3 hours          27017/tcp                 some-mongo          

我可以确认服务器在容器内运行：

→ docker logs ee5024d16a67
Listening on port 8080

但是,如果我尝试提出请求,则拒绝连接.

→ curl -i 0.0.0.0:49158
curl: (7) Failed connect to 0.0.0.0:49158; Connection refused

这里有什么我想念的吗？如果我在不使用docker的情况下运行应用程序,它会按预期工作：

→ node src/server.js 
Listening on port 8080

→ curl -i 0.0.0.0:8080
HTTP/1.1 200 OK
X-Powered-By: Express
Content-Type: text/html; charset=utf-8
Content-Length: 11
ETag: W/"b-1243066710"
Date: Mon,04 Aug 2014 05:11:58 GMT
Connection: keep-alive

Hello World