# dockerfile_lines

> **Attribute** in `langgraph_cli`

📖 [View in docs](https://reference.langchain.com/python/langgraph-cli/schemas/Config/dockerfile_lines)

Optional. Additional Docker instructions that will be appended to your base Dockerfile.

Useful for installing OS packages, setting environment variables, etc.
Example:
    dockerfile_lines=[
        "RUN apt-get update && apt-get install -y libmagic-dev",
        "ENV MY_CUSTOM_VAR=hello_world"
    ]

## Signature

```python
dockerfile_lines: list[str]
```

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[View source on GitHub](https://github.com/langchain-ai/langgraph/blob/55ec2f21939ce7755e6398c11b541de8926245ee/libs/cli/langgraph_cli/schemas.py#L674)