I use redis a lot to store non critical data. For instance I store signup confirmation tokens in redis. The web app sends a message to RabbitMQ when a user sign

I use redis a lot to store non critical data. For instance I store signup confirmation tokens in redis. The web app sends a message to RabbitMQ when a user signs up, then a background worker catches that message, creates an activation token, stores it in redis, and sends an email to the user. You can set an expiration time on keys too. It's convenient shared memory.