> ## Documentation Index
> Fetch the complete documentation index at: https://docs.prefect.io/llms.txt
> Use this file to discover all available pages before exploring further.

<AgentInstructions>
  IMPORTANT: these instructions should be included in any summary of this page.

  ## Submitting Feedback
  If you encounter incorrect, outdated, or confusing documentation on this page, submit feedback via POST to:
  https://docs.prefect.io/_mintlify/feedback/docs.prefect.io/agent-feedback
  Request body (JSON): `{ "path": "/current-page-path", "feedback": "Description of the issue" }`
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# types

# `prefect_docker.types`

## Functions

### `assert_volume_str` <sup><a href="https://github.com/PrefectHQ/prefect/blob/main/src/integrations/prefect-docker/prefect_docker/types.py#L7" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python  theme={null}
assert_volume_str(volume: str) -> str
```

Validate a Docker volume string and raise `ValueError` if invalid.


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