KCNA · Question #175
A new Pod is created. Then, the Pod is assigned to a Node. Which Kubernetes component was re-sponsible for determining which Node to assign the Pod to?
The correct answer is B. Scheduler. The Kubernetes Scheduler is the control plane component responsible for watching for newly created Pods that have no assigned node and selecting a node for them to run on.
Question
A new Pod is created. Then, the Pod is assigned to a Node. Which Kubernetes component was re-sponsible for determining which Node to assign the Pod to?
Options
- Akubelet
- BScheduler
- CAPI Server
- DController manager
How the community answered
(63 responses)- A6% (4)
- B89% (56)
- C3% (2)
- D2% (1)
Why each option
The Kubernetes Scheduler is the control plane component responsible for watching for newly created Pods that have no assigned node and selecting a node for them to run on.
The kubelet is an agent that runs on each node and ensures containers are running in a Pod, but it does not assign Pods to nodes.
The Scheduler component of the Kubernetes control plane is responsible for selecting the optimal node for newly created Pods to run on. It evaluates various factors like resource requirements, node constraints, taints and tolerations, and quality-of-service requirements to make its decision.
The API Server exposes the Kubernetes API, allowing interaction with the cluster, but it does not make scheduling decisions.
The Controller Manager runs various controllers that watch the shared state of the cluster, but it does not schedule Pods.
Concept tested: Kubernetes Scheduler function
Source: https://kubernetes.io/docs/concepts/overview/components/#kube-scheduler
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