Fly.io (flyctl) CLI

Operate Fly.io apps safely and repeatably with flyctl.

Defaults / safety

Prefer read-only commands first: fly status, fly logs, fly config show, fly releases, fly secrets list.
Do not edit/modify Fly.io apps, machines, secrets, volumes, or databases without your human’s explicit approval.
- Read-only actions are OK without approval.
- Destructive actions (destroy/drop) always require explicit approval.
When debugging builds, capture the exact error output and determine whether it’s a:
- build/packaging issue (Dockerfile, Gemfile.lock platforms, assets precompile)
- runtime issue (secrets, DB, migrations)
- platform issue (regions, machines, health checks)

From the app repo directory: