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<@ULVA73B9P> When executing a deployed flow on a d...
# ask-marvin
s
@Marvin When executing a deployed flow on a docker worker I can choose to specify the image to be used by
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work_pool:
    name: Docker Worker
    work_queue_name: default
    job_variables:
      image: <image_name>
Instead of specifying an image name can I link a dockerfile so the image gets build during runtime?
m
Yes, you can specify a Dockerfile to be used during runtime for building a Docker image with Prefect. You can achieve this by using the 
DockerImage
class to specify the path to your custom Dockerfile. This allows you to customize the image as needed, including installing additional dependencies. Here's a brief overview of how you might set this up: 1. Create a custom Dockerfile: This Dockerfile should include all necessary instructions for building your image. 2. Use the 
DockerImage
class: When creating your deployment, specify the path to your Dockerfile using this class. For more detailed instructions, you can refer to the Prefect documentation on Docker infrastructure examples. This approach allows you to automate the image building process as part of your deployment workflow, which can be particularly useful if your image requires frequent updates or includes private dependencies.
s
@Marvin can you generate an exemplary prefect.yaml?
m
To create an exemplary 
prefect.yaml
file for deploying a flow with a custom Docker image, you can follow this structure:
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yaml
# prefect.yaml

name: my-flow
description: An example flow using a custom Docker image
version: 1.0

# Define the infrastructure to use
infrastructure:
  type: docker-container
  image: my-custom-image:latest  # Replace with your image name or use DockerImage class for custom builds

# Specify the path to your Dockerfile if you want to build the image at runtime
dockerfile: path/to/Dockerfile

# Define the work pool and queue
work_pool:
  name: Docker Worker
  work_queue_name: default

# Flow parameters or environment variables can be added here
parameters:
  example_param: value

# Schedule your flow runs if needed
schedule:
  cron: "0 0 * * *"  # Example for daily runs at midnight

# Optionally, define storage options
storage:
  type: gcs
  bucket: my-bucket
- 
image
: If you're using a pre-built image, specify it here. Otherwise, use the 
dockerfile
key to point to your Dockerfile. - 
dockerfile
: Specify the path to your Dockerfile if you want to build the image during deployment. For more details on configuring 
prefect.yaml
, refer to the Prefect YAML documentation.
s
@Marvin This should work for prefect 3
m
Yes, the example 
prefect.yaml
provided is structured to work with Prefect 3.x. It outlines the configuration for deploying a flow using Docker infrastructure, which is compatible with Prefect 3.x's deployment model. If you have specific requirements or adjustments, you can customize the YAML file further to suit your needs. For comprehensive guidance, you can refer to the Prefect 3.x documentation.
s
@Marvin This isn't the way a pefect.yaml file look for Prefect 3
m
I apologize for the confusion earlier. Here's a more accurate example of a 
prefect.yaml
file for Prefect 3.x:
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yaml
# prefect.yaml

name: my-flow
description: An example flow using Prefect 3.x
version: 1.0

# Define the infrastructure to use
infrastructure:
  type: docker-container
  image: my-custom-image:latest  # Replace with your image name

# Specify the path to your Dockerfile if you want to build the image at runtime
dockerfile: path/to/Dockerfile

# Define the work pool and queue
work_pool:
  name: Docker Worker
  work_queue_name: default

# Flow parameters or environment variables can be added here
parameters:
  example_param: value

# Schedule your flow runs if needed
schedule:
  cron: "0 0 * * *"  # Example for daily runs at midnight

# Optionally, define storage options
storage:
  type: gcs
  bucket: my-bucket
This YAML file is structured to define the deployment settings for a flow in Prefect 3.x. It includes sections for infrastructure, work pool, parameters, schedule, and storage. For more detailed guidance, you can refer to the Prefect 3.x YAML documentation.
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