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
解决方法
我发现了混乱的根源.我的机器在Mac OSX上运行,因此我用
boot2docker安装了docker.
所以再次重复这个过程：
→ docker run -P -d jimjeffers/hello-world 28431b32b93dbecaa2a8a5b129cbd36eebe8a90f4c20ab10735455d82fa9de37 → docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 28431b32b93d jimjeffers/hello-world:latest node server.js 2 hours ago Up 9 minutes 0.0.0.0:49159->8080/tcp stoic_franklin 5d43b2dee28d mongo:2.6 /usr/src/mongo/docke 6 hours ago Up 4 hours 27017/tcp some-mongo
最后,诀窍不是连接到我自己的机器,而是从VM的IP地址卷曲：
→ boot2docker ip The VM's Host only interface IP address is: 192.168.59.103
所以当我卷起虚拟机时,我终于取得了成功：
→ curl -i 192.168.59.103:49159 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 04:32:37 GMT Connection: keep-alive
在Docker的installation guide上详细解释了这一点,但我错过了它,因为它是在文档的最后.
