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On a four-node cluster where each node has one CPU, a Pod requesting 1000m stays Pending on every node. What is the likely explanation?

  1. Requests above 999m are rejected by the scheduler
  2. CPU requests must be expressed in whole cores
  3. The scheduler reserves 25% of each node for the control plane
  4. Addon Pods on every node already consume part of each node's capacity
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Answer: D. Addon Pods on every node already consume part of each node's capacity

Cluster addon Pods run on each node and take part of its allocatable capacity, so a request equal to a node's full CPU can find nowhere to fit.

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

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