Linux installs NodeJs and works with Nginx to implement a reverse proxy

This paper introduces Linux installation of NodeJs and realization of reverse proxy with Nginx, as follows:

What is NodeJs?

Node.js is an JavaScript running environment (runtime). It actually encapsulates the Google V8 engine. V8 engine performs Javascript very quickly and with excellent performance.

Node.js optimizes some special use cases to provide an alternative API that makes V8 work better in a non-browser environment.

Local installation (OS X)

Version selection

V 4.4.4, long term support, mature and reliable V 6.2.0 stable version, latest features

I still prefer to use the latest version here

Download installation package

https://nodejs.org/dist/v6.2.0/node-v6.2.0.pkg

Double-click the install install package

Step 1, step 1, and the installation is complete.

Simple to perform

node -v

v6.2.0

Local operation (OS X)

Create the demo file

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}/`);
});

Write to the file example.js

Executable files

node example.js

The command line prints Server running at http://127.0.0.1:3000/

At the same time in the browser input http: / / 127.0.0.1:3000 /, page output Hello World

Close the terminal, the page is no longer available.

Express framework

We use the Express framework to build the website project demo.

npm install express

node_modules1

Create the demo.js file

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

Create the public folder in the peer folder and put the static file 1.jpg inside

In the browser input http: / / 127.0.0.1:8081/1. jpg

See Response Headers X - Powered - By: Express

Server installation (CentOS 7)

Install node

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

About the version of Node

The version number I installed through node in the last step is v0.10.42. At first, I thought it was wrong. After looking up the information, I found that four versions of node have been maintained so far

v0.10.42 (LTS) v0.12.10 (LTS) 4.4.5 LTS 6.2

Oh, what a mess.

Write an demo instance

This part of the process is as follows.

Install forever and run it

npm install forever -g

forever start app.js

Configuration Nginx

cd /usr/local/nginx/conf/vhost/

vi demonode.coderfix.cn.conf

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

Nginx resolves the domain name and forwards it to port 8899 ~ of the local nodejs

Configure domain name resolution and access

http://demonode.coderfix.cn/

This completes the deployment of nodejs and nginx.

Possible problems

The Nodejs service overruns, resulting in an error

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)1

Turn off the process you started and start again.

ps aux | grep node

kill -9 ****