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    <p>Ivo Wetzel's answer doesn't seem to be valid in Socket.io 0.9 anymore.</p> <p>In short you must now save the <code>socket.id</code> and use <code>io.sockets.socket(savedSocketId).emit(...)</code> to send messages to it.</p> <p>This is how I got this working in clustered Node.js server:</p> <p>First you need to set Redis store as the store so that messages can go cross processes:</p> <pre><code>var express = require("express"); var redis = require("redis"); var sio = require("socket.io"); var client = redis.createClient() var app = express.createServer(); var io = sio.listen(app); io.set("store", new sio.RedisStore); // In this example we have one master client socket // that receives messages from others. io.sockets.on('connection', function(socket) { // Promote this socket as master socket.on("I'm the master", function() { // Save the socket id to Redis so that all processes can access it. client.set("mastersocket", socket.id, function(err) { if (err) throw err; console.log("Master socket is now" + socket.id); }); }); socket.on("message to master", function(msg) { // Fetch the socket id from Redis client.get("mastersocket", function(err, socketId) { if (err) throw err; io.sockets.socket(socketId).emit(msg); }); }); }); </code></pre> <p>I omitted the clustering code here, because it makes this more cluttered, but it's trivial to add. Just add everything to the worker code. More docs here <a href="http://nodejs.org/api/cluster.html" rel="noreferrer">http://nodejs.org/api/cluster.html</a></p>
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    1. POSend message to specific client with socket.io and node.js
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    1. COThanks it was helpful. I just had to use an array instead: `io.of('/mynamespace').sockets[socketID].emit(...)` (don't know if it's because I'm using a namespace)
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      1. USAdrien Schuler
    2. COAbsolutely correct, there is some problem in 0.9.
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    3. COon clustered environment, how do I make sure that the correct process that the socket belongs to is sending the messsage ?
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      1. USGal Ben-Haim
 

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