Exercise the local ephemeral port range and see if it's exhausted

grab-a-socket.js

// Exercise the local ephemeral port range and see if it's exhausted
// usage: `while [ 1 ]; do node ~/grab-a-socket.js; sleep 1; done`

var net = require('net');

var options = {
  port: 63300,
  host: '127.0.0.1'
};

var connectListener = function() {
  var elapsed = Date.now() - startTime;
  console.log(new Date().toISOString(), 'socket connected', 
              socket.address(), socket.remoteAddress, socket.remotePort,
              elapsed + 'ms');
  socket.end();
};

var startTime = Date.now();
var socket = net.connect(options, connectListener);

socket.on('data', function(data) {
  var elapsed = Date.now() - startTime;
  console.log(new Date().toISOString(), 'data', data.toString(), elapsed + 'ms');
  socket.end();
});

socket.on('error', function(error) {
  var elapsed = Date.now() - startTime;
  console.log(new Date().toISOString(), 'Error:', error.toString(), elapsed + 'ms');
  socket.end();
});

socket.on('end', function() {
  var elapsed = Date.now() - startTime;
  console.log(new Date().toISOString(), 'socket disconnected', elapsed + 'ms');
});