You can set up 4 processes with thin, just do: > thin -e production -s 4 start The problem is that each process listens on its own port. They can't all listen

You can set up 4 processes with thin, just do: > thin -e production -s 4 start The problem is that each process listens on its own port. They can't all listen on port 3000, so you need some sort of proxy to parcel out the requests.