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<@ULVA73B9P> Hi, I have a deploy.yaml file to depl...
# ask-marvin
p
@Marvin Hi, I have a deploy.yaml file to deploy my prefect flow. How can I add an step in the Dockerfile that will be generated?
m
To add a custom step in the Dockerfile that will be generated during your Prefect deployment, you'll need to use the 
prefect_docker.deployments.steps.build_docker_image
step in your 
deploy.yaml
. You can specify a custom Dockerfile using the 
dockerfile
field. Here is a basic example of what your 
deploy.yaml
might look like with a custom Dockerfile step:
Copy code
build:
  - prefect_docker.deployments.steps.build_docker_image:
      requires: prefect-docker>=0.3.0
      image_name: my-repo/my-image
      tag: my-tag
      dockerfile: path/to/your/Dockerfile  # Specify the path to your custom Dockerfile
      push: true
Ensure the specified Dockerfile includes your custom steps as needed for your setup. For further details, visit the Prefect Deployment Guide. If you need more refined assistance, please provide more specifics about the custom step you want to add.
p
@Marvin I have this code:
Copy code
build:

- prefect_docker.deployments.steps.build_docker_image:
    id: build-image
    requires: prefect-docker>=0.4.0
    image_name: '{{ $PREFECT_IMAGE_NAME }}'
    tag: '{{ $IMAGE_TAG }}'
    dockerfile: auto
    platform: linux/amd64
And I want to add an step to install a dependency in the container. How can i do it?
m
To add a custom step to install a dependency in the Dockerfile generated by your 
prefect_docker.deployments.steps.build_docker_image
, you need to provide a custom Dockerfile. Here’s how you can do it: 1. Create a custom Dockerfile that includes the installation of your desired dependency. For example:
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# path/to/your/Dockerfile
    FROM python:3.9-slim
    
    # Install the dependencies
    RUN apt-get update && apt-get install -y <your-dependency>
    
    # Install Prefect
    RUN pip install prefect
    
    # Copy your Prefect flow file (if needed)
    COPY your_flow.py /opt/prefect/flows/your_flow.py
    
    # Set the entrypoint (optional)
    ENTRYPOINT ["prefect"]
2. Update your 
deploy.yaml
to reference the custom Dockerfile:
Copy code
yaml
    build:
      - prefect_docker.deployments.steps.build_docker_image:
          id: build-image
          requires: prefect-docker>=0.4.0
          image_name: '{{ $PREFECT_IMAGE_NAME }}'
          tag: '{{ $IMAGE_TAG }}'
          dockerfile: path/to/your/Dockerfile  # Specify the path to your custom Dockerfile
          platform: linux/amd64
By doing this, the 
prefect_docker.deployments.steps.build_docker_image
step will use your custom Dockerfile, which includes the additional dependency installation. For more details about customizing Docker builds in Prefect, you can check out the Prefect Deployment Guide.
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