《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：
点击(此处)折叠或打开
- ....
- 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;
- }
- }
2、构建NodeJS服务器
点击(此处)折叠或打开
- 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/');
- });
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
