Linux安装NodeJs并配合Nginx实现反向代理

const http = require('http');
const hostname = '127.0.0.1';
const port = 3000;
const server = http.createServer((req, res) => {
  res.statusCode = 200;
  res.setHeader('Content-Type', 'text/plain');
  res.end('Hello World\n');
});
server.listen(port, hostname, () => {
  console.log(`Server running at http://${hostname}:${port}/`);
});

node_modules

var express = require('express');
app = express(); 
app.use(express.static(__dirname + '/public'));  
app.listen(8081)

curl --silent --location https://rpm.nodesource.com/setup | bash -
yum -y install nodejs
yum install npm

server {
listen 80;
server_name demonode.coderfix.cn;
    location / {
    proxy_pass http://127.0.0.1:8899;
    }
}

events.js:72
    throw er; // Unhandled 'error' event
          ^
Error: listen EADDRINUSE
    at errnoException (net.js:884:11)
    at Server._listen2 (net.js:1022:14)
    at listen (net.js:1044:10)
    at Server.listen (net.js:1110:5)
    at Object.<anonymous> (folderName/app.js:33:24)
    at Module._compile (module.js:456:26)
    at Object.Module._extensions..js (module.js:474:10)
    at Module.load (module.js:356:32)
    at Function.Module._load (module.js:312:12)
    at Function.Module.runMain (module.js:497:10)

ps aux | grep node
kill -9 ****