What is a Scheduler in Kubernetes?

The Scheduler in Kubernetes is a component responsible for distributing pods across the cluster nodes. Its task is to determine on which node to run a new pod, considering available resources, constraints, placement requirements, and policies.

Main functions of the Scheduler:

• Checking resource availability (CPU, memory) on nodes.
• Considering constraints such as affinity/anti-affinity, taints, and tolerations.
• Optimizing load distribution and resource utilization.

The Scheduler operates after the API server receives a request to create a pod, but the pod has not yet been assigned to a node. It selects an appropriate node and updates the pod object, indicating the chosen node for deployment.