nodeSelector

Definition

nodeSelector is a field in Kubernetes that allows you to constrain a Pod to be scheduled on nodes that match specific labels. It acts as a simple key-value pair filter, ensuring that the Pod only runs on nodes that have the specified labels. This is useful for ensuring that workloads are placed on nodes with the appropriate resources, capabilities, or compliance requirements.

Secure Settings Example

apiVersion: v1
kind: Pod
metadata:
  name: secure-pod
spec:
  nodeSelector:
    environment: production
    compliance: pci-dss

In this example, the Pod is scheduled only on nodes labeled with environment: production and compliance: pci-dss, ensuring it runs in a secure and compliant environment.

Insecure Settings Example

apiVersion: v1
kind: Pod
metadata:
  name: insecure-pod
spec:
  nodeSelector:
    environment: development

This configuration schedules the Pod on nodes labeled with environment: development, which may not have the necessary security controls or compliance measures for production workloads, potentially exposing sensitive data or services to risk.