How can a Phoenix application tailored only to use channels scale on multiple machines? Using HAProxy? How to broadcast messages to all nodes?

Question

I use the node application purely for socket.io channels with Redis PubSub, and at the moment I have it spread across 3 machines, backed by nginx load balancing on one of the ma

Answer 1

Look at Phoenix.PubSub It's where Phoenix internally has the Channel communication bits.

It currently has two adapters:

• Phoenix.PubSub.PG2 - uses Distributed Elixir, directly exchanging notifications between servers. (This requires that you deploy your application in a elixir/erlang distributed cluster way.)
• Phoenix.PubSub.Redis - uses Redis to exchange data between servers. (This should be similar to solutions found in socket.io and others)