https://prefect.io logo
Join Slack
Powered by
Hi <@ULVA73B9P>, when doing "prefect deploy --all"...
# ask-marvin
d
Hi @Marvin, when doing "prefect deploy --all" for k8s, dockerfile: auto, can I include environment variables in the dockerfile / image build?
m
To include environment variables in your Dockerfile or image build when running 
prefect deploy --all
for Kubernetes with 
dockerfile: auto
, follow these guidelines: 1. Prefect Automatically Handles Dockerfile Creation: - When specifying 
dockerfile: auto
, Prefect will create a Dockerfile that installs any requirements.txt and copies over the current directory. - Refer to these Kubernetes deployment and Prefect Deploy guides for more details. 2. Including Environment Variables: - To include environment variables during the Dockerfile creation, you can pass them using a custom Dockerfile or by specifying them within the 
dockerfile.auto
configuration. For more specific config or a step-by-step example, please check the linked documentation. If you need advanced customization, creating a custom Dockerfile might be more feasible. I didn’t find any specific GitHub issues related to including environment variables with 
dockerfile: auto
deployment. Feel free to consult the documentation for additional details: - Kubernetes Deployment Guide - Prefect Deploy Guide Let me know if there's anything else you need!
d
@Marvin Where is dockerfile.auto that you refer to please?
m
The 
dockerfile:auto
configuration in Prefect automatically generates a Dockerfile for you. This auto-generated Dockerfile isn't stored as a physical file on your system but is created and used dynamically during the deployment process. The key points are: - Automatic Creation: When you specify 
dockerfile:auto
, Prefect automatically generates a Dockerfile based on typical conventions such as copying your project directory and installing requirements. - Customization: If you need to customize your Docker build, you can provide a custom Dockerfile instead by specifying a path with 
dockerfile: path/to/your/Dockerfile
. For more detailed guidance on this, refer to the official Kubernetes Deployment Guide and Prefect Deploy Guide. If you have specific environment variables or other customizations, creating a custom Dockerfile might be the best approach. Here is a simple example of what such a Dockerfile could look like:
Copy code
FROM python:3.12

WORKDIR /usr/src/app

COPY requirements.txt ./
RUN pip install --no-cache-dir -r requirements.txt

COPY . .

# Example of adding environment variables
ENV MY_ENV_VAR=example_value

CMD ["python", "./your_script.py"]
You can then specify this Dockerfile in your Prefect deployment configuration. Feel free to consult the documentation linked above for more details, and let me know if you have further questions!
d
@Marvin So there is no such 
dockerfile.auto
configuration that you initially referred to?
m
I apologize for any confusion. No physical file named 
dockerfile.auto
is stored on your system, nor does a specific configuration file by that name exist. Instead, specifying 
dockerfile: auto
in a Prefect deployment configuration informs Prefect to automatically generate a Dockerfile using default settings. If you wish to customize the Dockerfile for your deployment, you'll need to create a physical Dockerfile and specify its path in your deployment configuration. Here's the key excerpt on this topic from the documentation: “By specifying 
dockerfile: auto
, Prefect will automatically create a Dockerfile that installs any 
requirements.txt
and copies over the current directory.” If you need more control over the Dockerfile, such as setting environment variables, you'll need to create a custom Dockerfile. You can then provide this custom Dockerfile to Prefect by setting 
dockerfile
to the path of your newly created file. For more details, please refer to the official documentation: - Kubernetes Deployment Guide - Prefect Deploy Guide Let me know if there's anything specific you need help with or any further questions!
d
Thanks @Marvin. In that case, if I include my existing Dockerfile with 
ARG MY_SECRET=PROVIDED_BY_THE_PIPELINE
and I want to use the equivalent of 
--build-arg MY_SECRET="$(my-secret)
m
To pass build arguments to a Dockerfile using Prefect, you can use the 
DeploymentImage
class and specify the 
buildargs
parameter. Here’s an example based on the documentation: 1. Dockerfile Setup: Ensure your Dockerfile includes the 
ARG
instruction:
Copy code
FROM python:3.12
   ARG MY_SECRET
   ENV MY_SECRET_ENV=${MY_SECRET}
   ...
2. Prefect Deployment Setup: Use the 
DeploymentImage
class to pass 
buildargs
in your deployment script:
Copy code
python
   from prefect import flow
   from prefect.deployments.runner import DeploymentImage
   from prefect.blocks.system import Secret

   @flow(log_prints=True)
   def my_flow():
       # Your flow logic
       pass

   if __name__ == "__main__":
       my_secret = "some_secret_value"  # Fetch or define your secret
       deployment_image = DeploymentImage(
           name="my-image",
           tag="latest",
           dockerfile="Dockerfile",
           buildargs={"MY_SECRET": my_secret}
       )
       my_flow.deploy(
           name="my-deployment",
           work_pool_name="k8s-demo",
           image=deployment_image
       )
This script dynamically builds the Docker image with the provided 
buildargs
, including your secret as a build argument. Refer to the Prefect docs for more details on deployment configurations: - Prefect Deploy Guide Let me know if you need further assistance!
4 Views
Open in Slack
PreviousNext
Powered by