[Solved] Given this pod spec snippet, what will happen if a pod with label app: frontend is scheduled?affinity: podAffinity: requiredDuringSchedulingIgnoredDuringExecution: - labelSelector: matchLabels: app:... | Kubernetes

Kubernetes - Scheduling

Given this pod spec snippet, what will happen if a pod with label app: frontend is scheduled?

affinity:
  podAffinity:
    requiredDuringSchedulingIgnoredDuringExecution:
    - labelSelector:
        matchLabels:
          app: backend
      topologyKey: kubernetes.io/hostname

AThe pod will be scheduled only if no pod with label app=backend exists

BThe pod will be scheduled on any node regardless of other pods

CThe pod will be scheduled on a node that already runs a pod with label app=backend

DThe pod scheduling will fail due to syntax error

Step-by-Step Solution

Solution:

Step 1: Understand required podAffinity behavior
Required podAffinity means the pod must be placed on a node where pods with matching labels already run, here app=backend.
Step 2: Apply to given pod spec
The pod with label app=frontend requires a node with pods labeled app=backend, so it will schedule only on such nodes.
Final Answer:
The pod will be scheduled on a node that already runs a pod with label app=backend -> Option C
Quick Check:
Required podAffinity = schedule near matching pods [OK]

Quick Trick: Required podAffinity means schedule near matching pods [OK]

Common Mistakes:

Thinking podAffinity prevents scheduling near pods
Confusing required and preferred affinity
Assuming scheduling fails without matching pods

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More Kubernetes Quizzes

Given this pod spec snippet, what will happen if a pod with label app: frontend is scheduled?

Step 1: Understand required podAffinity behavior

Step 2: Apply to given pod spec

Final Answer:

Quick Check:

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