function start(){
      // TCP or unix-domain socket repl
      server = net.createServer(function(sock){
        sockets.push(sock);
        var ctx = repl.start('cluster> ', sock).context;
        master.emit('repl socket', sock);

        // augment socket to provide some formatting methods
        sock.title = function(str){ this.write('\n  \033[36m' + str + '\033[0m\n'); }
        sock.row = function(key, val){ this.write('  \033[90m' + key + ':\033[0m ' + val + '\n'); }

        // merge commands into context
        // executing in context of master
        Object.keys(exports).forEach(function(cmd){
          ctx[cmd] = function(){
            var args = Array.prototype.slice.call(arguments);
            args.unshift(master, sock);
            return exports[cmd].apply(master, args);
          };
        });
      });

      // Apply all arguments given
      server.listen.apply(server, args);
    }
Enable REPL with all arguments passed to `net.Server#listen()`.

Examples:

   cluster(server)
     .use(cluster.stats())
     .use(cluster.repl('/var/run/cluster'))
     .listen();

In the terminal:

   $ sudo telnet /var/run/cluster 

@return {Function}
@api public