How to use socket.io-redis with multiple servers?

Question

i have following code on two machines

 var server       = require('http').createServer(app);
    io               = require('socket.io')(server);
    var redisAdapter = require('socket.io-redis');
    io.adapter(redisAdaptebr({host: config.redis.host, port: config.redis.port}));
    server.listen(config.port, function () {

and I store socket.id of every client connected to these two machines on central db, ID of sockets is being saved and event sending on same server works flawlessly, but when I try to send message to the socket of other server it doesn't work..

subSocket = io.sockets.connected[userSocketID];
   subSocket.emit('hello',{a:'b'})

How can i know that redis is wokring good.
How to send message to socket connected on another server.

tkone · Accepted Answer · 2015-12-14 18:11:38Z

1

You can't. Socket.IO requires sticky sessions. The socket must communicate solely with the originating process.

docs

You can have the socket.io servers communicate to each other to pass events around, but the client must continue talking to the process with which it originated.

answered Dec 14, 2015 at 18:11

tkone

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3 Comments

Husnain Ashfaq Over a year ago

So how can i send event from server, to another server's socket?

tkone Over a year ago

There are recommendations on how to do that at the bottom of the documentation to which I linked.

Husnain Ashfaq Over a year ago

as mentioned above i tried the same doc, redis adapter. but no use :(

Raphael Baumann · Accepted Answer · 2016-02-19 11:20:15Z

0

I'm in a similar issue but I can answer your first question. you can monitor all the commands processed by redis using that command on the terminal:

redis-cli monitor

http://redis.io/commands/MONITOR

Unfortunately I cannot help you further as I am still having issues even though both server are sending something to redis.

answered Feb 19, 2016 at 11:20

Raphael Baumann

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