I've been searching around looking for help on setting up a multi-server cluster for a Node.js Socket.IO install. This is what I am trying to do:
n
number of Node servers running Express, and Socket.IO io.connect
and then have it filter to one the of the servers behind the loadbalancer. For example - if we have Server A, Server B and Server C behind LB1 (F5), and User A is connected to Server A, User B is connected to Server B and User C is connected to Server C.
In a "chat" scenario - basically if a message is emitted from Server A to message
event - Server B and C should also send the message to their connected client. I read that this is possible with using socket-io.redis
, but it needs a Redis box - which server should that be install on? If all the servers are connected to the same Redis box - does this work automatically?
var io = require('socket.io')(server);
var redis = require('socket.io-redis');
io.adapter(redis({ host: 'localhost', port: 6379 }));
Any help would be greatly appreciated thanks!
The answer to this question is that you must set up a single Redis server that is either outside your SocketIO cluster - and have all nodes connect to it.
Then you simply add this at the top of your code and it just works magically without any issues.
var io = require('socket.io')(server);
var redis = require('socket.io-redis');
io.adapter(redis({ host: 'localhost', port: 6379 }));
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