问题 I am new to docker. I am trying to get a simple node app running on docker. However I am facing an issue with the docker port publish. Docker version - 18.03.0-ce, build 0520e24302 My simple app code: 'use strict'; const express = require('express'); // Constants const PORT = 8081; const HOST = '0.0.0.0'; // App const app = express(); app.get('/', (req, res) => { res.send('Hello world\n'); }); app.listen(PORT, HOST); console.log(`Running on http://${HOST}:${PORT}`); My docker file: FROM node