节点集群：如何为每个工人分配单独的server/port？

Question

我知道我可以使用 Nodes cluster 模块来创建多个 worker 都服务于相同的套接字连接（来自文档的示例）：

var cluster = require('cluster');
var http = require('http');
var numCPUs = require('os').cpus().length;

if (cluster.isMaster) {
  // Fork workers.
  for (var i = 0; i < numCPUs; i++) {
    cluster.fork();
  }

  cluster.on('exit', function(worker, code, signal) {
    console.log('worker ' + worker.process.pid + ' died');
  });
} else {
  // Workers can share any TCP connection
  // In this case its a HTTP server
  http.createServer(function(req, res) {
    res.writeHead(200);
    res.end("hello world\n");
  }).listen(8000);
}

但是，如果我不提供相同的连接而是希望每个工作人员运行他们自己的服务器，每个人都在一个单独的端口上侦听怎么办？

Answer 1

您可以将环境变量传递给每个子进程，允许主进程为它们分配端口：

var cluster = require('cluster');
var numCPUs = require('os').cpus().length;

if (cluster.isMaster) {
  var pidToPort = {}; 
  var worker, port;
  for (var i = 0; i < numCPUs; i++) {
    port = 8000 + i;
    worker = cluster.fork({port: port});
    pidToPort[worker.process.pid] = port;
  }

  console.log(pidToPort);

  cluster.on('exit', function(worker, code, signal) {
    // Use `worker.process.pid` and `pidToPort` to spin up a new worker with
    // the port that's now missing.  If you do so, don't forget to delete the
    // old `pidToPort` mapping and add the new one.
    console.log('worker ' + worker.process.pid + ' died');
  }); 
} else {
  // Start listening on `process.env.port` - but first, remember that it has
  // been cast to a string, so you'll need to parse it.
  console.log(process.env.port);
}

节点集群：如何为每个工人分配单独的server/port？

Node Cluster: How to assign separate server/port to each worker?

node.js

node-cluster