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CKA study material · question 382 of 1000

Why is a node's schedulable headroom smaller than its machine size suggests?

  1. The kubelet reserves half the memory
  2. The scheduler keeps 25% in reserve
  3. Capacity is reported before the disk is mounted
  4. Addon Pods on every node consume part of each node's capacity
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Answer: D. Addon Pods on every node consume part of each node's capacity

Cluster addon Pods run on every node and take a share of its capacity.

Source: Debug Running Pods (Kubernetes) — Example: debugging Pending Pods

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