@Marvin: For prefect 3.x: I'm building and pushing a docker image separate from the prefect.yaml, which I use only to define the deployments. Now I want my (remote) worker to pull the image from a private container registry. How do I define the pull step for this in the prefect.yaml?

To define the pull step for a Docker image from a private container registry in your

prefect.yaml

, you should focus on configuring the deployment to use the correct image and credentials. Here’s a concise guide: 1. Image Specification: Ensure your Docker image is correctly specified in the

prefect.yaml

. Prefect 3.x allows you to define the image directly in the deployment configuration. 2. Credentials Management: Use Prefect's Secret blocks to securely manage and access credentials needed to authenticate with your private registry. This might involve setting environment variables or using Prefect's built-in secret handling. 3. Prefect YAML Configuration: Although the

prefect.yaml

file does not directly manage Docker pulling logic, you can utilize Prefect's infrastructure blocks to handle authentication and pulling. For example:

yaml
   deployments:
     - name: my-deployment
       image: <http://my-private-registry.com/my-image:latest|my-private-registry.com/my-image:latest>
       infrastructure:
         type: docker-container
         env:
           REGISTRY_USERNAME: "{{ prefect.blocks.secret('registry-username') }}"
           REGISTRY_PASSWORD: "{{ prefect.blocks.secret('registry-password') }}"

4. Docker Pull Logic: If you need custom logic for pulling the image, consider using a custom Dockerfile or a shell script that runs as part of your deployment process. For more detailed information, you can explore Prefect's Docker infrastructure examples and Prefect YAML documentation. If you need further assistance on specific configurations or have additional constraints, feel free to ask!

@Marvin: I think you gave me a prefect 2.x example there; It should be something like this:

pull:
- prefect.deployments.steps.git_clone:

Except I don't want to git_clone, I want to pull the image

To define a pull step for a Docker image from a private registry in Prefect 3.x, you'll use the

pull

section in your

prefect.yaml

. This section specifies how Prefect should pull your deployment's resources in remote execution environments. Here's a basic structure:

yaml
pull:
  - prefect.deployments.steps.docker_pull:
      image: "<http://my-private-registry.com/my-image:latest|my-private-registry.com/my-image:latest>"
      registry_username: "{{ prefect.blocks.secret('registry-username') }}"
      registry_password: "{{ prefect.blocks.secret('registry-password') }}"

### Key Points: - Image: Specify the Docker image you wish to pull. - Credentials: Use Prefect's secret blocks to securely handle your private registry credentials. This setup ensures that your Prefect deployment can authenticate and pull the Docker image from your private registry when running remotely. For more detailed information on configuring the

prefect.yaml

, you can refer to Prefect's infrastructure concepts documentation.