Fly.io reference

Quick references for often-used resources like flyctl and fly.toml. Or dig a little deeper into Fly.io capabilities and how they work.

About Fly.io

  • Architecture: A brief overview of how Firecracker VMs, Anycast networking, Fly Proxy, and the backhaul network come together to create Fly.io’s infrastructure.

  • Regions: The regions around the world where we run servers so your apps can run close to your users.

Reference docs

  • flyctl: The Fly CLI reference documentation.

  • Fly Launch Configuration (fly.toml): The settings for configuring your app in the fly.toml configuration file. The Fly Launch configuration includes how the app is built, its volume mounts, network services, and more.

Working with Fly.io

  • Fly Apps: What’s a Fly App anyway? The abstraction that holds everything you deploy on Fly.io.

  • App Availability and Resiliency: An overview of the features that can make your app more resistant to events like hardware failures or outages.

  • Builders: The different ways you can assemble applications into deployable images for Fly.io.

  • Load Balancing: An explanation of how Fly.io’s proxy distributes traffic to your application instances based on load, closeness, and concurrency settings.

  • Monorepo and Multi-Environment Deployments: The command options you can use with flyctl to build and deploy multiple apps from a monorepo or deploy an app to multiple targets.

  • Secrets - Build time: How to set and use Docker secrets to make secrets available at build time.

  • Secrets - Runtime: How to set and use secrets, which are exported to the running App through environment variables, and find out how they work with deployments to help secure your App.

  • Metrics: The fully-managed metrics that you can access for your app on Fly.io.

  • Deploy Tokens: An experimental feature to use in place of standard API tokens.