2

I know their are a lot of questions and answers about this issue on the net but I can't get it to work.

I have a server written in node.js and listening to connections with socket.io

Now, The sockets can exchange messages between them, like a chat and I'm broadcasting the incoming messages to all other sockets on the server.

I want to run my node server on 3 different servers, each one of them have different IP, Lets call them: SERVER1, SERVER2 and SERVER3. Here comes my confusion, if i'm sending a message from a socket which connected to SERVER1, How the sockets that connected to SERVER2 and SERVER3 will see this message?

I heard about RedisStore, RabbitMQ and other stuff but i can't find a good article/post/book that can explain me how to do it right...

Can someone help me please?

Improve this question

1 Answer 1

Reset to default
4

I believe RedisStore does this automatically for you, here's a good post about it: http://www.ranu.com.ar/2011/11/redisstore-and-rooms-with-socketio.html

How is this done internally?

Well as you have heard, Redis, RabbitMQ, ZeroMQ etc have pub-sub functionality, meaning you can subscribe to channels and publish info on them (to all the connected peers):

https://github.com/mranney/node_redis#publish--subscribe

So server A, B and C are subscribed to the same channel. When a client connected to server A wants to send a message for all the users connected to the chat room "js" for example, he sends a message to the server A and server A publishes a message on the "js" channel. All the rest of the servers get that message and broadcast it to all their clients.

Improve this answer
Sign up to request clarification or add additional context in comments.

2 Comments

So, you mean that one of my servers should run only a redis server and my other two servers will run my node/socket.io server code and subscribe all income messages to the redis server?
Yes that's the idea, but every connected peer should both publish and subscribe to Redis.

Start asking to get answers

Find the answer to your question by asking.

Ask question

Explore related questions

See similar questions with these tags.