Node.js支持多個服務器間的多重負載均衡？

Question

我很好奇在node.js中的水平縮放 是否可以跨多個虛擬服務器（如rackspace雲服務器）進行負載平衡？ 我讀過關於集羣插件，但我認爲它只適用於具有多核CPU的單個服務器。

Answer 1

嘗試爲node-http-proxyroundrobin.js：

var httpProxy = require('http-proxy'); 
// 
// A simple round-robin load balancing strategy. 
// 
// First, list the servers you want to use in your rotation. 
// 
var addresses = [ 
    { 
    host: 'ws1.0.0.0', 
    port: 80 
    }, 
    { 
    host: 'ws2.0.0.0', 
    port: 80 
    } 
]; 

httpProxy.createServer(function (req, res, proxy) { 
    // 
    // On each request, get the first location from the list... 
    // 
    var target = addresses.shift(); 

    // 
    // ...then proxy to the server whose 'turn' it is... 
    // 
    proxy.proxyRequest(req, res, target); 

    // 
    // ...and then the server you just used becomes the last item in the list. 
    // 
    addresses.push(target); 
}); 

// Rinse; repeat; enjoy.