本篇文章探讨了Node.js教程之用Nginx做Node.js应用的负载均衡，希望阅读本篇文章以后大家有所收获，帮助大家对相关内容的理解更加深入。

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负载均衡可以把用户的请求分摊到多个服务器上进行处理，从而实现了对海量用户的访问支持。负载均衡的架构如图所示：对于复杂的Web应用来说，用Nginx做前端负载均衡是理所当然的事。下面，我们用Nginx做NodeJS应用的负载均衡。1、配置Nginx修改nginx.conf：....
        upstream sample {
       server 127.0.0.1:3000;
       server 127.0.0.1:3001;
       keepalive 64;
     }
         server {
         listen 80;
         ....
            server_name 127.0.0.1;
         ....
            location / {
               proxy_redirect off;
               proxy_set_header X-Real-IP $remote_addr;
               proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
               proxy_set_header X-Forwarded-Proto $scheme;
               proxy_set_header Host $http_host;
               proxy_set_header X-NginX-Proxy true;
               proxy_set_header Connection "";
               proxy_http_version 1.1;
               proxy_pass //sample;
           }
        }
这里在3000端口和3001端口各有一个Node.js服务器，这两个服务器在做同样的工作。在upstream节，配置了两个Node.js服务器。此外，我们还设置了proxy_pass //sample做HTTP请求代理。2、构建NodeJS服务器var http = require(‘http‘);
var morgan       = require(‘morgan‘);
var server1 = http.createServer(function (req, res) {
  console.log("Request for:  " + req.url + "-- port 3000 ");
  res.writeHead(200, {‘Content-Type‘: ‘text/plain‘});
  res.end(‘Hello Node.js\n‘);
}).listen(3000, "127.0.0.1");
var server2 = http.createServer(function (req, res) {
  console.log("Request for:  " + req.url + "-- port 3001 ");
  res.writeHead(200, {‘Content-Type‘: ‘text/plain‘});
  res.end(‘Hello Node.js\n‘);
}).listen(3001, "127.0.0.1");
server1.once(‘listening‘, function() {
  console.log(‘Server running at //127.0.0.1:3000/‘);
});
server2.once(‘listening‘, function() {
  console.log(‘Server running at //127.0.0.1:3001/‘);
});
3、访问Nginx服务器现在我们可以访问//127.0.0.1可以看到如下的输出：  Server running at //127.0.0.1:3000/
  Server running at //127.0.0.1:3001/
  Request for:  /-- port 3001
  Request for:  /favicon.ico-- port 3000
  Request for:  /favicon.ico-- port 3001
  Request for:  /-- port 3000
  Request for:  /favicon.ico-- port 3001
  Request for:  /favicon.ico-- port 3000
  Request for:  /-- port 3001
  Request for:  /favicon.ico-- port 3000
  Request for:  /favicon.ico-- port 3001
  Request for:  /-- port 3000
  Request for:  /favicon.ico-- port 3001
  Request for:  /favicon.ico-- port 3000
   

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