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Understanding Kubernetes: Part 23 Node Selector
📢 If you’ve been following our Kubernetes series 2025, welcome back! For new readers, check out Part 22: Resource Requests & Limits
📖 Not a Medium member? No worries! Here’s the free link: Part 23 — Node Selector
What is Node Selector in Kubernetes?
In Kubernetes, a Node Selector is a simple way to constrain a pod to run on a specific set of nodes. It ensures that your workloads are scheduled on the appropriate nodes based on labels assigned to them.
- Labels: Key-value pairs assigned to nodes that categorize them based on attributes like hardware type, region, or purpose.
- nodeSelector: A field in the pod specification that matches node labels to schedule pods on specific nodes.
Why Use Node Selector?
✅ Hardware Optimization: Schedule workloads on nodes with specific CPU, memory, or GPU capabilities.
✅ Cost Efficiency: Run cost-sensitive workloads on cheaper node pools.
✅ High Availability: Ensure critical workloads run on dedicated nodes for reliability.
✅ Compliance & Security: Deploy sensitive applications on isolated nodes for security.
