Making Machines Move. Another deep technical dive into Fly.io infrastructure from Thomas Ptacek, this time describing how they can quickly boot up an instance with a persistent volume on a new host (for things like zero-downtime deploys) using a block-level cloning operation, so the new instance gets a volume that becomes accessible instantly, serving proxied blocks of data until the new volume has been completely migrated from the old host.
Recent articles
- Phoenix.new is Fly's entry into the prompt-driven app development space - 23rd June 2025
- Trying out the new Gemini 2.5 model family - 17th June 2025
- The lethal trifecta for AI agents: private data, untrusted content, and external communication - 16th June 2025