Run NATS via Docker

docker run -p 4222:4222 -p 8222:8222 nats -DV

Set DB (Postgresql - Default user)

rails db:setup

With no workers (a message is sent to NATS)

WEB_CONCURRENCY=0 rails s

With workers (no message is sent to NATS)

WEB_CONCURRENCY=2 rails s

Test

Watch NATS server if a command is comming from the application

open http://localhost:300