@Marvin, how do I use the buildargs in the prefect.yaml file build action?

To help you with the use of

buildargs

in the

prefect.yaml

file, I first need to identify which version of Prefect you are using. Could you please let me know if you're working with Prefect 2.x or 3.x?

@Marvin Prefect 3.0.10

In Prefect 3.0.10, you can utilize the

buildargs

within a

prefect.yaml

file to specify arguments that should be passed to the build process of a Docker image. This is done within the

build

step of the

prefect.yaml

. Here's an example of how you might set this up:

yaml
build:
  - prefect_docker.deployments.steps.build_docker_image:
      id: build-image
      requires: prefect-docker>=0.3.0
      image_name: my-repo/my-image
      tag: my-tag
      dockerfile: auto
      push: true
      buildargs:
        ARG_NAME: ARG_VALUE

In this example,

buildargs

is a dictionary where each key-value pair represents the name and value of a build argument. These arguments can be used in your Dockerfile to customize the build. For more detailed information, you can refer to the Prefect 3.x documentation on infrastructure concepts for prefect.yaml: Prefect 3.x Documentation.

Can I use the buildarg EXTRA_PIP_PACKAGES using the default prefect image prefecthq/prefect:3.0.10-python3.10 ? Or do I have to use that as a base image to my own dockerfile in order to use it?

The

EXTRA_PIP_PACKAGES

build argument is typically used to add additional Python packages to a Docker image during the build process. In Prefect's case, if you want to use this build argument with the default Docker image (

prefecthq/prefect:3.0.10-python3.10

), you'll need to create your own Dockerfile that uses the default image as the base image. Here's how you can do it: 1. Create a new Dockerfile:

FROM prefecthq/prefect:3.0.10-python3.10

ARG EXTRA_PIP_PACKAGES=""
RUN pip install $EXTRA_PIP_PACKAGES

2. Then, specify the

EXTRA_PIP_PACKAGES

build argument when building your image:

docker build --build-arg EXTRA_PIP_PACKAGES="your-package-1 your-package-2" -t my-prefect-image .

The default Prefect image itself does not natively support dynamic installation of additional packages via a

buildarg

without creating a custom Dockerfile. Hence, you need to use the default image as a base and modify it according to your requirements.

@Marvin, in the prefect.yaml, how do I update the dockerfile variable in the build_docker_image to point to a different dockerfile outside of the current directory?

To specify a Dockerfile located outside the current directory in the

prefect.yaml

file, you need to set the

dockerfile

path correctly in the

build_docker_image

step. You can provide a relative or an absolute path to the

dockerfile

variable. Here's how you can configure your `prefect.yaml`:

yaml
build:
  - prefect_docker.deployments.steps.build_docker_image:
      id: build-image
      requires: prefect-docker>=0.3.0
      image_name: my-repo/my-image
      tag: my-tag
      dockerfile: ../path/to/your/Dockerfile  # specify the relative or absolute path here
      push: true

In this example,

../path/to/your/Dockerfile

is the relative path to the Dockerfile that resides outside of the current directory. Ensure that the path is correct relative to where the

prefect.yaml

is located, or use an absolute path for clarity.