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<@ULVA73B9P> I have several flows on prefect that ...
# ask-marvin
c
@Marvin I have several flows on prefect that attempt to distinguish between a dev and prod environment. When running them with EKS hosted workers and a work pool, I want them to determine which environment they are a part of by checking the os of the environment they are in. How can I set an EKS hosted worker or work pool to have an application environment variable, and how can I set it to dev or prod
m
To help you set up environment variables for EKS hosted workers or work pools in Prefect, I'll guide you through how this might typically be achieved, although precise details can depend on your Prefect version and setup, which we need to confirm. In general, setting environment variables for pods running on EKS can be done using Kubernetes ConfigMaps and Secrets. Here’s a general approach: 1. ConfigMap/Secrets: Use Kubernetes to define ConfigMaps and Secrets for your environment variables. This allows you to configure environment variables at a pod level. 2. Deployment Specification: Modify your deployment specification to include these ConfigMaps or Secrets. This typically involves adding them under the 
env
section of your container specification. 3. Prefect and Kubernetes: If you are running Prefect agents in Kubernetes, you might need to adjust the deployment configurations for these agents to include environment variables. This can be specified in the agent's Kubernetes configuration. For executing these configurations in Prefect across varying versions, we typically need to refer to the official Prefect documentation for the specific steps. Here’s what you would generally do: - Set environment variables within your Kubernetes specifications. - Configure Prefect task or flow logic to read these environment variables using Python's 
os.environ
. I will search the Prefect documentation for more detailed instructions specific to your setup. Could you confirm whether you are using Prefect 2.x or 3.x, or provide more specific queries related to your Prefect version? This will help me provide precise steps or direct links.
It seems some errors occurred while searching for the relevant Prefect documentation. Let's address your question directly. To set an environment variable in a Prefect flow when using EKS hosted workers and work pools, you'll typically use Kubernetes' ConfigMaps or Secrets to manage these variables. Here's a general approach: 1. Create a ConfigMap or Secret in Kubernetes: - Use 
kubectl
to create a ConfigMap or Secret that stores your environment setting, e.g., 
ENV_TYPE: dev
. 2. Update your EKS Pod deployment: - Modify the EKS Kubernetes Pod spec to include these environment variables. You can do this in the deployment YAML file:
Copy code
yaml
     env:
     - name: ENV_TYPE
       valueFrom:
         configMapKeyRef:
           name: your-configmap-name
           key: ENV_TYPE
3. Access the Environment Variable in Your Prefect Flow: - In your Prefect flow, you can access the environment variable using Python's 
os
module:
Copy code
python
     import os

     def determine_environment():
         env_type = os.getenv("ENV_TYPE", "dev")  # Default to 'dev' if not set
         print(f"Running in {env_type} environment")
         return env_type
4. Deployment Considerations: - Ensure that your Prefect agents/workers are configured to run with the necessary permissions and access to the ConfigMaps/Secrets. 5. Testing: - Test this configuration in a staging or non-production environment to confirm it's correctly identifying the environment. This setup allows your Prefect flows to dynamically identify whether they're running in a development or production environment based on the configuration provided by Kubernetes. If the documentation errors persist, I recommend checking directly on the Prefect documentation website or their GitHub repository for more detailed examples related to your specific version (2.x or later).
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