socket.io-redis

How to use

var io = require('socket.io')(3000);
var redis = require('socket.io-redis');
io.adapter(redis({ host: 'localhost', port: 6379 }));

By running socket.io with the socket.io-redis adapter you can run multiple socket.io instances in different processes or servers that can all broadcast and emit events to and from each other.

If you need to emit events to socket.io instances from a non-socket.io process, you should use socket.io-emitter.

API

adapter(uri[, opts])

uri is a string like localhost:6379 where your redis server is located. For a list of options see below.

adapter(opts)

The following options are allowed:

• key: the name of the key to pub/sub events on as prefix (socket.io)
• host: host to connect to redis on (localhost)
• port: port to connect to redis on (6379)
• socket: unix domain socket to connect to redis ("/tmp/redis.sock"). Will be used instead of the host and port options if specified.
• pubClient: optional, the redis client to publish events on
• subClient: optional, the redis client to subscribe to events on

If you decide to supply pubClient and subClient, make sure you use node_redis as a client or one with an equivalent API.

If you supply clients, make sure you initialized them with the return_buffers option set to true.

Adapter with password

If you need to create a redisAdapter to a redis instance that has a password, use pub/sub options.

Example:

var pub = redis.createClient(port, host, {auth_pass:"PASSWORD"});
var sub = redis.createClient(port, host, {detect_buffers: true, auth_pass:"PASSWORD"} );

io.adapter( redisAdapter({pubClient: pub, subClient: sub}) );

License

MIT