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.

score 1 · Answer 1 · answered Dec 14 '15 at 18:11

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 '15 at 18:11

tkone

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So how can i send event from server, to another server's socket? – Husnain Ashfaq Dec 14 '15 at 18:17
There are recommendations on how to do that at the bottom of the documentation to which I linked. – tkone Dec 14 '15 at 18:18
as mentioned above i tried the same doc, redis adapter. but no use :( – Husnain Ashfaq Dec 14 '15 at 19:20

score 0 · Answer 2 · answered Feb 19 '16 at 11:20

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.

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

2 Answers2