Dockerizing Node.js app

Question

While trying to dockerize node app, when I visit localhost:8000 I get this error:

The connection was reset - the connection to the server was reset while the page was loading.

In the terminal when I use the run command on image, I get the desired output in console. It says:

Server running at http://localhost:8000/

Dockerfile:

FROM node

RUN mkdir -p /app/
WORKDIR /app

COPY package.json /app

RUN cd /app

RUN npm install

COPY . /app

CMD ["node", "index.js"]
EXPOSE 8000

index.js:

#!/usr/bin/env nodejs

var http = require('http');
http.createServer(function(req, res) {
    res.writeHead(200, { 'Content-Type': 'text/plain' });
    res.end('Hello World\n');
}).listen(8000, 'localhost');
console.log('Server running at http://localhost:8000/');

package.json:

{
  "name": "server1",
  "version": "1.0.0",
  "description": "Dockerizing node-app",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "Himanshu",
  "license": "ISC"
}

Here is the run command that I used

sudo docker run -p 8000:8000 -it --name node-container2 my-node-image

All these files are saved in same directory.

sudo docker run -p 8000:8000 -it --name node-container2 my-node-image — Himansingh
– Himansingh, Commented Oct 19, 2017 at 12:13
Yes I tried 0.0.0.0 It gives same result. And this is the only thing I am getting on running the container Server running at localhost:8000 Were u asking for this? — Himansingh
– Himansingh, Commented Oct 19, 2017 at 12:18
Yeah I did that and got this..... Server running at localhost:8000... Nothing else — Himansingh
– Himansingh, Commented Oct 19, 2017 at 12:33

nickgryg · Accepted Answer · 2017-10-19 14:23:59Z

1

Just change your index.js to work on 0.0.0.0 inside container:

#!/usr/bin/env nodejs

var http = require('http');
http.createServer(function(req, res) {
    res.writeHead(200, { 'Content-Type': 'text/plain' });
    res.end('Hello World\n');
}).listen(8000, '0.0.0.0');
console.log('Server running at http://0.0.0.0:8000/');

And you will be able to access your app via localhost on a host machine.

answered Oct 19, 2017 at 14:23

nickgryg

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1 Comment

Himansingh Over a year ago

I have accepted but votes casted by those with less than 15 reputations are not displayed publicaly. Sorry :( and thank you for the help.

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