gistfile1.js

//FIRST SERVER (server1.js)


var io = require('socket.io')(3000);
var redis = require('socket.io-redis');
io.adapter(redis({ host: 'localhost', port: 6379 }));

var test = 0;

io.on('connection', function (socket) {
    test+=1;
    console.log("connection. test = " + test);
});

//SECOND SERVER (server2.js)


var io = require('socket.io')(4000);
var redis = require('socket.io-redis');
io.adapter(redis({ host: 'localhost', port: 6379 }));

var test = 0;

io.on('connection', function (socket) {
    test+=1;
    console.log("connection. test = " + test);
});

//