《用Nginx做NodeJS应用的负载均衡》
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:
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....
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upstream sample {
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server 127.0.0.1:3000;
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server 127.0.0.1:3001;
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keepalive 64;
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}
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server {
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listen 80;
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....
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server_name 127.0.0.1;
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....
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location / {
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proxy_redirect off;
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proxy_set_header X-Real-IP $remote_addr;
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proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
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proxy_set_header X-Forwarded-Proto $scheme;
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proxy_set_header Host $http_host;
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proxy_set_header X-NginX-Proxy true;
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proxy_set_header Connection "";
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proxy_http_version 1.1;
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proxy_pass http://sample;
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}
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}
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
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var http = require('http');
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var morgan = require('morgan');
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var server1 = http.createServer(function (req, res) {
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console.log("Request for: " + req.url + "-- port 3000 ");
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res.writeHead(200, {'Content-Type': 'text/plain'});
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res.end('Hello Node.js\n');
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}).listen(3000, "127.0.0.1");
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var server2 = http.createServer(function (req, res) {
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console.log("Request for: " + req.url + "-- port 3001 ");
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res.writeHead(200, {'Content-Type': 'text/plain'});
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res.end('Hello Node.js\n');
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}).listen(3001, "127.0.0.1");
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server1.once('listening', function() {
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console.log('Server running at ');
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});
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server2.once('listening', function() {
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console.log('Server running at ');
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});
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
Server running at
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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