> For the complete documentation index, see [llms.txt](https://help.fovus.co/docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.fovus.co/docs/pipeline/miniwdl/miniwdl-submission/enable-memguard.md).

# Enable Memguard for miniWDL

Enable Fovus Memguard memory checkpointing for miniWDL tasks.

[Fovus Memguard](/docs/memguard/overview.md) checkpoints task memory periodically and on spot interruption, so an interrupted task resumes from its last checkpoint instead of restarting from scratch. Before enabling it, confirm your workload meets the [Memguard prerequisites](/docs/memguard/enable-memguard.md#prerequisites) — container architecture, working directory, `glibc` version, and any JVM or network-retry adjustments.

## Enable memory checkpointing

Set `isMemoryCheckpointingEnabled` as a Fovus Token in the task's `runtime{}` block:

```wdl
runtime {
    docker: "biocontainers/bwa:latest"
    isMemoryCheckpointingEnabled: true
    allowPreemptible: true  # recommended — enables spot instances
}
```

`isMemoryCheckpointingEnabled` is the only attribute required to activate Memguard. `allowPreemptible` is optional but strongly recommended — spot instances are the primary scenario Memguard protects against.

As with any Fovus Token, wire these to workflow inputs if you want to override them per run from `inputs.json` without editing the WDL file — see [Prepare inputs and configure WDL](/docs/pipeline/miniwdl/miniwdl-submission/prepare-inputs.md).

For the full attribute reference, see [miniWDL configuration reference](/docs/pipeline/miniwdl/miniwdl-config-reference.md).

{% hint style="info" %}
Fovus automatically injects the Docker run options required for Memguard into each task's container invocation. You do not need to configure any Docker flags manually. The injected flags are: `--privileged`, `--cap-add=SYS_PTRACE`, `--init`, `--security-opt seccomp=unconfined`, `--detach`, `-v fovus-libs:/opt/fovus-libs`, `-v $PWD/.fovus-tmp:/tmp`, `--cgroupns=private`.
{% endhint %}


---

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