How to properly scale an application on nodejs and socket io?

Question

Redis

I run nodejs in several threads using the module - https://habrahabr.ru/post/208914/
Everything works fine in one thread, but ws does not connect to two or more. https://yadi.sk/i/3DHGzZGw3HLpyy
Same with the socket.io-redis module.
Application - chat.
Actually the question is in the title. Thanks in advance.

Answer 1

https://www.npmjs.com/package/socketio-sticky-session
or https://github.com/PROGrand/sticky-socket-cluster