Nginx做NodeJS应用负载均衡配置实例

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:

Nginx做NodeJS应用负载均衡配置实例 nginx 第1张

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 http://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 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.jsn');   }).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.jsn');   }).listen(3001, "127.0.0.1");      server1.once('listening', function() {    console.log('Server running at http://127.0.0.1:3000/');   });      server2.once('listening', function() {    console.log('Server running at http://127.0.0.1:3001/');   });   

3、访问Nginx服务器

现在我们可以访问
可以看到如下的输出:

  Server running at http://127.0.0.1:3000/   Server running at http://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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