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<@ULVA73B9P> How can I add the node selector as a job variable for a k8s based work-pool in prefect
# marvin-in-the-wild
s
@Marvin How can I add the node selector as a job variable for a k8s based work-pool in prefect
m
To add a node selector as a job variable for a Kubernetes-based work pool in Prefect, you need to override the job variables in your deployment. Here's a general approach: 1. Job Variables: You can define job variables in your deployment script to specify the node selector. 2. Using `infra_overrides`: When creating your deployment, use 
infra_overrides
to specify infrastructure-related overrides, including the node selector. Here is an example based on the provided documentation and common patterns:
Copy code
python
from prefect.deployments import Deployment
from prefect.infrastructure.kubernetes import KubernetesJob  # Import KubernetesJob infrastructure

# Define your flow
from my_flow import my_flow_function

# Define the KubernetesJob with your specific configuration
k8s_job = KubernetesJob(
    image="my-custom-image:latest",
)

# Define `infra_overrides` with node selector
infra_overrides = {
    "nodeSelector": {
        "<http://kubernetes.io/hostname|kubernetes.io/hostname>": "specific-node-name"
    }
}

# Deploy your flow with the specified overrides
deployment = Deployment.build_from_flow(
    flow=my_flow_function,
    name="my_deployment",
    work_pool_name="my_k8s_work_pool",
    infrastructure=k8s_job,
    infra_overrides=infra_overrides
)

if __name__ == "__main__":
    deployment.apply()
### Additional Resources: - Overriding Work Pool Job Variables - Prefect Kubernetes Worker documentation For any specific issues or tailored advice, you might want to check this GitHub issue related to infra_overrides and other related discussions. If you encounter specific issues, ensure you search the documentation and the Prefect GitHub repository for any related updates or fixes.
s
@Marvin Im using a prefect.yaml file to deploy my deployment not from python in that case how will that yaml file look like
m
To configure your 
prefect.yaml
file with a node selector for a Kubernetes-based work pool, follow these steps: 1. Job Definition: Use the 
infrastructure.overrides
section to specify the node selector. 2. Deployment Configuration: Include the flow deployment details. Here's an example configuration for your `prefect.yaml`:
Copy code
yaml
# prefect.yaml

version: 2

build:
  - prefect_docker.deployments.steps.build_docker_image:
      id: build-image
      requires: prefect-docker>=0.3.0
      image_name: my-image
      tag: latest
      dockerfile: auto

push:
  - prefect_docker.deployments.steps.push_docker_image:
      id: push-image
      requires: prefect-docker>=0.3.0
      image_name: my-image
      tag: latest

# Definitions are reusable configurations
definitions:
  work_pools:
    my_kubernetes_work_pool:
      type: kubernetes
      job_variables:
        image: "my-image:latest"
      overrides:
        nodeSelector:
          <http://kubernetes.io/hostname|kubernetes.io/hostname>: "specific-node-name"

deployments:
  - name: my_deployment
    flow_name: my_flow
    version: latest
    infra_overrides:
      nodeSelector:
        <http://kubernetes.io/hostname|kubernetes.io/hostname>: "specific-node-name"
    work_pool:
      name: my_kubernetes_work_pool
      job_variables:
        image: "my-image:latest"
This file template includes: - 
work_pools
Definitions: These are reusable settings for your work pools, including job variables and node selector overrides. - Deployment Configuration: Defines the deployment settings, including flow name, version, and specific 
infra_overrides
for the node selector. ### Additional Resources: - Prefect Deploy Guide - Prefect Kubernetes Integration - GitHub issue on Kubernetes deployments For further customization, refer to these resources for specific details on overriding job variables and other deployment configurations.
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