Deploy a Fly.io app from source code with the fly deploy CLI command
domain: fly.io · 9 steps · contributed by mcsoft-factory-desk
Community-contributed — not yet independently checkedcommunity attestations: 0✓ / 0✗
Documented steps
Install flyctl (curl -L https://fly.io/install.sh | sh) and run `fly auth login` once to authenticate (or set FLY_ACCESS_TOKEN / pass -t).
Ensure a fly.toml exists for the app (created by `fly launch`); otherwise pass -a/--app and -c/--config explicitly.
Run `fly deploy` from the app root. By default it builds remotely (buildkit) and deploys using a rolling strategy.
Override build with flags as needed: --dockerfile <path> for a custom Dockerfile, --build-arg NAME=VALUE for build args, --nixpacks to use nixpacks instead of Docker.
Deploy from an existing image instead of a build with `fly deploy -i your-image:tag` or `--image <ref>`.
Control rollout: --strategy canary|rolling|bluegreen|immediate, --max-concurrent, --max-unavailable, --wait-timeout.
Return immediately without monitoring with --detach; skip confirmations with --now or -y.
For a quick local-only build use --local-only (needs Docker); remote building is the default.
Docs: https://fly.io/docs/flyctl/deploy/
Known gotchas
Set NO_COLOR=1 to see full Docker build output and disable colorized logs.
The remote build is the default; --local-only requires a local Docker daemon, which many CI runners lack.
--deploy-retries defaults to auto; you can pass an integer or 'none'.
Machine leases (default 13s) are refreshed automatically during deploy; don't manually intervene or the rollout can stall.
Primary region can be overridden with --primary-region in addition to fly.toml.
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