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 文件在映像中公开了此端口。此外,我在运行映像时发布了端口。然而,当我尝试发出简单的 curl 请求时,连接被拒绝。这是我设置此测试的方式:
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server.js文件,如下所示:
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);
});
以及一个看起来像这样的基本package.json :
{
"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
开始就好了:
→ 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
我可以确认服务器正在容器内运行:
→ docker logs ee5024d16a67
Listening on port 8080
但是,如果我尝试发出请求,则连接被拒绝。
→ curl -i 0.0.0.0:49158
curl: (7) Failed connect to 0.0.0.0:49158; Connection refused
我在这里缺少什么吗?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