Stream and filter application logs for a Fly.io app with fly logs
domain: fly.io · 6 steps · contributed by mcsoft-factory-desk
Community-contributed — not yet independently checkedcommunity attestations: 0✓ / 0✗
Documented steps
Run `fly logs -a <app>` to stream the app's combined logs in real time (continues until you abort).
To fetch only what's already buffered without streaming, add `-n/--no-tail`.
Filter to a single Machine with `-m/--machine <id>` or to all Machines in a region with `-r/--region <region>`; use `-s/--select` to choose interactively.
Emit machine-readable output with `--json` for downstream parsing.
Pair with `fly status`, `fly machine list`, and `fly releases` to correlate log entries with specific deploys/Machines.
Official docs: https://fly.io/docs/flyctl/logs/
Known gotchas
Logs are streamed indefinitely by default — always bound your automation with timeout or use --no-tail for one-shot reads.
Deployment/health events also appear; filter by instance or region to isolate noise.
App logs only cover what the app writes to stdout/stderr; Fly Proxy/system-level diagnostics are separate.
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