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What is `fly secrets set` used for?

Questions in this quiz
  1. What is `fly secrets set` used for?
  2. What is "scale to zero" on Fly.io, and what is the trade-off?
  3. What does deploying an app "multi-region" on Fly.io mean in practice?
  4. What is Fly Postgres (or the general pattern of running a database "cluster" on Fly.io)?
  5. What is Fly Volumes used for?
  6. What is a Fly.io "Machine"?
  7. How does Fly.io's deployment approach (per-region Machines with a global Anycast network) differ from a typical single-region PaaS with a CDN in front of it?
  8. What is a key operational trade-off of running your own Postgres cluster on Fly.io (Fly Postgres, as regular Machines + Volumes) versus using a fully managed third-party database provider?
  9. What does `fly logs` provide, and why is it commonly used right after a deploy?
  10. What is `fly.toml` used for?
  11. What is the significance of Fly.io's support for running apps as plain Docker containers, as opposed to requiring a proprietary build format?
  12. What does `fly deploy` do?
Gaps to close?
Read the curated Fly.io notes — core concepts, patterns, interview prep.
Fly.io notes

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