fn-serverless/docs/scaling.md

Scaling IronFunctions

The QuickStart guide is intended just to quickly get started and kick the tires. To run in production and be ready to scale, there are a few more steps.

• Run a database that can scale, such as Postgres.
• Put the iron/functions API behind a load balancer and launch more than one machine.
• For asynchronous functions:
  • Start a separate message queue (preferably one that scales)
  • Start multiple iron/functions-runner containers, the more the merrier

There are metrics emitted to the logs that can be used to notify you when to scale. The most important being the wait_time metrics for both the synchronous and asynchronous functions. If wait_time increases, you'll want to start more servers with either the iron/functions image or the iron/functions-runner image.