集群工作器中的 Node.js http-proxy

Question

我在 node js 中構建了一個示例代碼

var cluster = require("cluster"),
    http = require("http"),
    express = require('express'),
    port = parseInt(process.argv[2]||8001),
    servers =  ['http://127.0.0.1:800821', 'http://127.0.0.1:800831'];;

if (cluster.isMaster) {

  console.log('Master ' + process.pid + ' has started.');
     var numWorkers = require('os').cpus().length;

    console.log('Master cluster setting up ' + numWorkers + ' workers...');

    for(var i = 0; i < 1; i++) {
        cluster.fork();
    }

    cluster.on('online', function(worker) {
        console.log('Worker ' + worker.process.pid + ' is online');
    });

    cluster.on('exit', function(worker, code, signal) {
        console.log('Worker ' + worker.process.pid + ' died with code: ' + code + ', and signal: ' + signal);
        console.log('Starting a new worker');
        cluster.fork();
    });
} else {
    var httpProxy = require('http-proxy');
    var proxy = httpProxy.createProxyServer();
    var count = 0;
    // Workers share the TCP connection in this server
    var app = express();
    app.get('/', function (req, res) {
        console.log('Cluster => ' + process.pid);
        loadBalanceProxy(req,res);
    }).listen(port);

    var currentServer = 1;
    function loadBalanceProxy(req, res){
        var cur = currentServer%servers.length;
        currentServer++;
        var target = servers[cur];
        console.log("Proxy => " + target);
        proxy.web(req, res, {
            target: target
        });
    }
}

http.createServer(function (req, res) {
  res.writeHead(200, { 'Content-Type': 'text/plain' });
  res.write('request successfully proxied to: ' + req.url + '\n' + JSON.stringify(req.headers, true, 2));
  res.end();
}).listen(800831);

http.createServer(function (req, res) {
  res.writeHead(200, { 'Content-Type': 'text/plain' });
  res.write('request successfully proxied to: ' + req.url + '\n' + JSON.stringify(req.headers, true, 2));
  res.end();
}).listen(800821);

在這個示例中，我想在集群工作器中創建代理服務器，這給了我錯誤bind EADDRINUSE null:800831我想知道我可以在集群工作器中創建 http-proxy bind EADDRINUSE null:800831 。 如果我不能，那么有機器之間負載平衡的解決方案嗎？

Answer 1

我在群集中創建了一個代理反向示例代理反向 ，並且在另一個文件中創建了3個服務器，它對我有用（不要忘了分別運行這些服務器，例如，在您以4 cmd啟動服務器的Windows上，為1cmd代理啟動其他服務器（3 cmd）對於服務器）

 // var https = require('https'); scure var http = require('http'); var proxy = require('http-proxy'); var cluster = require('cluster'); var fs = require('fs'); var request = require('request'); // const numCPUs = require('os').cpus().length; var numCPUs = 4; if (cluster.isMaster) { for (var i = 0; i < numCPUs; i++) { cluster.fork(); } cluster.on('fork', (worker) => { console.log('worker ' + worker.process.pid); }); cluster.on('exit', function(worker, code, signal) { console.log('Worker ' + worker.process.pid + ' died with code: ' + code + ', and signal: ' + signal); console.log('Starting a new worker'); cluster.fork(); }); } else { startProxyReverse(); } function startProxyReverse() { http.globalAgent.maxSockets = 10240; // Define the servers to load balance. var servers = [{ host: '127.0.0.1', port: 8001 }, { host: '127.0.0.1', port: 8003 }, { host: '127.0.0.1', port: 8002 }]; var failoverTimer = []; // load the SSL cert // var ca = [ // fs.readFileSync('./certs/PositiveSSLCA2.crt'), // fs.readFileSync('./certs/AddTrustExternalCARoot.crt') // ]; // var opts = { // ca : ca, // key : fs.readFileSync('./certs/example_wild.key'), // cert : fs.readFileSync('./certs/STAR_example_com.crt') // }; // Create a proxy object for each target. var proxies = servers.map(function(target) { return new proxy.createProxyServer({ target: target // ws : true, // xfwd : true, // ssl : opts, // down : false }); }); /** * Select a random server to proxy to. If a 'server' cookie is set, use that * as the sticky session so the user stays on the same server (good for ws fallbacks). * @param {Object} req HTTP request data * @param {Object} res HTTP response * @return {Number} Index of the proxy to use. */ var selectServer = function(req, res) { var index = -1; var i = 0; // Check if there are any cookies. if (req.headers && req.headers.cookie && req.headers.cookie.length > 1) { var cookies = req.headers.cookie.split('; '); for (i = 0; i < cookies.length; i++) { if (cookies[i].indexOf('server=') === 0) { var value = cookies[i].substring(7, cookies[i].length); if (value && value !== '') { index = value; break; } } } } // Select a random server if they don't have a sticky session. if (index < 0 || !proxies[index]) { index = Math.floor(Math.random() * proxies.length); } // If the selected server is down, select one that isn't down. if (proxies[index].options.down) { index = -1; var tries = 0; while (tries < 5 && index < 0) { var randIndex = Math.floor(Math.random() * proxies.length); if (!proxies[randIndex].options.down) { index = randIndex; } tries++; } } index = index >= 0 ? index : 0; // Store the server index as a sticky session. if (res) { res.setHeader('Set-Cookie', 'server=' + index + '; path=/'); } return index; }; /** * Fired when there is an error with a request. * Sets up a 10-second interval to ping the host until it is back online. * There is a 10-second buffer before requests start getting blocked to this host. * @param {Number} index Index in the proxies array. */ var startFailoverTimer = function(index) { if (failoverTimer[index]) { return; } failoverTimer[index] = setTimeout(function() { // Check if the server is up or not request({ url: 'http://' + proxies[index].options.target.host + ':' + proxies[index].options.target.port, method: 'HEAD', timeout: 10000 }, function(err, res, body) { failoverTimer[index] = null; if (res && res.statusCode === 200) { proxies[index].options.down = false; console.log('Server #' + index + ' is back up.'); } else { proxies[index].options.down = true; startFailoverTimer(index); console.log('Server #' + index + ' is still down.'); } }); }, 10000); }; // Select the next server and send the http request. var serverCallback = function(req, res) { console.log('Process ' + process.pid + ' is listening to all incoming requests'); var proxyIndex = selectServer(req, res); console.log(proxyIndex); var proxy = proxies[proxyIndex]; proxy.web(req, res); proxy.on('error', function(err) { startFailoverTimer(proxyIndex); }); }; console.log('create server'); // var server = http.createServer(opts, serverCallback); scure server var server = http.createServer(serverCallback); // http.createServer(serverCallback).listen(8000); // Get the next server and send the upgrade request. // server.on('upgrade', function (req, socket, head) { // var proxyIndex = selectServer(req); // var proxy = proxies[proxyIndex]; // proxy.ws(req, socket, head); // proxy.on('error', function (err, req, socket) { // socket.end(); // startFailoverTimer(proxyIndex); // }); // }); server.listen(8000); // server.listen(443); scure port // var proxi = proxy.createServer(); // http.createServer(function (req, res) { // var target = { // target : servers.shift() // }; // console.log('Process ' + process.pid + ' is listening to all incoming requests'); // console.log('balancing request to: ', target); // proxi.web(req, res, target); // servers.push(target.target); // }).listen(8000); } 

Answer 2

端口應在 1-65535 范圍內。