Nginx做NodeJS应用负载均衡配置实例

(编辑:jimmy 日期: 2024/12/27 浏览:2)

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

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 http://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 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http://127.0.0.1
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