fly.io

Add a custom domain to a Fly app and obtain TLS certificates via DNS validation or TLS-ALPN challenge.

Enable private networking between Fly apps using .internal DNS and Flycast with allocated private IPv6 addresses.

Configure TCP and HTTP health checks on Fly Machines with startup grace period and check intervals.

Configure TCP and HTTP health checks on Fly Machines with startup grace period and check intervals.

Set app secrets for Fly machines: use flyctl and API, understand restart behavior and secret availability timing

Create and manage Fly volumes via Machines API: create, attach to machines, extend size, and manage snapshots

Configure autostop/autostart for machines to enable idle-driven lifecycle management

Update an existing Fly Machine's config via the Machines API (image, guest CPU/memory, env vars)

Manage Fly Machine lifecycle (start/stop/suspend/delete) safely via the Machines API using leases and the wait endpoint.

Create and start a Machines API machine running a Docker image with HTTP service and public ports.

Create a Fly app and prepare it for Machines via the Machines API, including public IP allocation.

Authenticate to the Fly.io Machines API using API tokens and authorization headers.