[英]How to access Docker container app on local?
I have a simple Node.js/Express app: 我有一个简单的Node.js / Express应用程序:
const port = 3000
app.get('/', (req, res) => res.send('Hello World!'))
app.listen(port, () => console.log(`Example app listening on port ${port}!`))
It works fine when I start it like: node src/app.js 当我启动它时,它工作正常:node src / app.js
Now I'm trying to run it in a Docker container. 现在我试图在Docker容器中运行它。 Dockerfile is: Dockerfile是:
FROM node:8
WORKDIR /app
ADD src/. /app/src
ADD package.json package-lock.json /app/
RUN npm install
COPY . /app
EXPOSE 3000
CMD [ "node", "src/app.js" ]
It starts fine: docker run <my image>:
它开始很好: docker run <my image>:
Listening on port 3000
But now I cannot access it in my browser: http://localhost:3000 但现在我无法在浏览器中访问它: http:// localhost:3000
This site can’t be reached localhost refused to connect.
Same happen if I try to run it within docker-compose: 如果我尝试在docker-compose中运行它,也会发生同样的情况:
version: '3.4'
services:
service1:
image: xxxxxx
ports:
- 8080:8080
volumes:
- xxxxxxxx
myapp:
build:
context: .
dockerfile: Dockerfile
networks:
- private
ports:
- 3000
command:
node src/app.js
Not sure if I deal right with ports in both docker files 不确定我是否正确处理两个docker文件中的端口
You need to publish ports 您需要发布端口
docker run -p 3000:3000 <my image>
-p
- stands for publish -p
- 代表发布
try this: 尝试这个:
services:
myapp:
build:
context: .
dockerfile: Dockerfile
networks:
- private
ports:
- 3000:3000 ##THIS IS THE CHANGE, YOU NEED TO MAP MACHINE PORT TO CONTAINER
command:
node src/app.js
When you work with docker you must define the host for your app as 0.0.0.0
instead of localhost
. 使用docker时,必须将应用程序的主机定义为0.0.0.0
而不是localhost
。
For your express application you can define the host on app.listen
call. 对于您的快速应用程序,您可以在app.listen
调用上定义主机。
Check the documentation : app.listen([port[, host[, backlog]]][, callback]) 检查文档 : app.listen([port [,host [,backlog]]] [,callback])
Your express code should be updated to: 您的快速代码应更新为:
const port = 3000
const host = '0.0.0.0'
app.get('/', (req, res) => res.send('Hello World!'))
app.listen(port, host, () => console.log(`Example app listening on ${port}!`))
It's also important publish docker ports: 发布docker端口也很重要:
docker run -p 3000:3000 <my image>
运行docker: docker run -p 3000:3000 <my image>
services:
myapp:
build:
context: .
dockerfile: Dockerfile
networks:
- private
ports:
- 3000:3000
command:
node src/app.js
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