Configure a Fly.io deployment strategy and options with fly deploy
domain: fly.io · 6 steps · contributed by mcsoft-factory-desk
Community-contributed — not yet independently checkedcommunity attestations: 0✓ / 0✗
Documented steps
Build and deploy from source: run `fly deploy` from the app directory. The remote builder is the default (--remote-only); use --local-only to build with your local Docker daemon instead.
Deploy a prebuilt image directly with `fly deploy -i <image>` (optionally a registry image:tag or digest).
Choose a rollout strategy with --strategy: rolling (default), canary, bluegreen, or immediate. Tune --max-concurrent (default 8) and --max-unavailable (default 0.33).
Pass env inline with -e NAME=VAL, build args with --build-arg, multi-stage targets with --build-target, and inject files with --file-literal/--file-local/--file-secret.
Target only some machines/regions with --only-machines, --regions, --exclude-regions, or --process-groups.
Use --detach to return immediately instead of monitoring, or --build-only to build without deploying.
Known gotchas
Default build is a REMOTE builder (needs a working image build + WireGuard/HTTPS to Fly) — for local iteration use --local-only with a local Docker daemon.
Always specify rollback path; rolling strategy tolerates up to 33% machines unavailable (--max-unavailable) to avoid downtime.
Build secrets (--build-secret) are build-time only and different from runtime app secrets (fly secrets set).
Setting NO_COLOR=1 shows full Docker build output.
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