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docs(hetzner): Explicitly set docker log driver to a sensible default #334

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nwoolmer merged 1 commit into from
Jan 23, 2026
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docs(hetzner): Explicitly set docker log driver to a sensible default #334

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11 changes: 11 additions & 0 deletions documentation/deployment/hetzner.md
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Expand Up @@ -231,6 +231,7 @@ renderText={(release) => (
-p 9000:9000 -p 9009:9009 -p 8812:8812 -p 9003:9003 \\
-v "/questdb/qdbroot:/var/lib/questdb" \\
-e JVM_PREPEND="-Xmx12g" \\
--log-driver local \\
questdb/questdb:${release.name}`}
</CodeBlock>
)}
Expand All @@ -256,6 +257,16 @@ In the example command above for a CPX41 (16GB RAM) instance we allocate ~12GB t
- For 32GB server: Use `-Xmx24g`
- For 64GB server: Use `-Xmx48g`

**Docker log driver configuration:**

The command above uses `--log-driver local` to prevent unbounded log file growth. Docker's default [`json-file`](https://docs.docker.com/engine/logging/drivers/json-file/) driver has no automatic log rotation or size limits, which can lead to disk space exhaustion on the host.

The [`local`](https://docs.docker.com/engine/logging/drivers/local/) driver provides automatic log rotation with sensible defaults:
- **Maximum log size**: 100MB total
- **Log files**: 5 files of 20MB each

These limits can be customized using `--log-opt`. Consult the [`local`](https://docs.docker.com/engine/logging/drivers/local/) driver documentation for details.

### Verification

Verify your QuestDB deployment:
Expand Down