Multiple dynos on Heroku + socket.io broadcasts

Question

I seem to be having an issue where socket.io broadcasts in my node.js app on Heroku don\'t seem to work when I have more than 1 dyno. As soon as I scale it to 1, it works p

Answer 1

If you're running on multiple dynos/servers then you have to configure socket.io to use a non-in-memory session store like the RedisStore. The socket.io documentation has details and there's more discussion here.