[Solved] You wrote this pod spec with pod anti-affinity but pods are still scheduled on the same node. What is the likely error? affinity: podAntiAffinity: preferredDuringSchedulingIgnoredDuringExecution:... | Kubernetes

Kubernetes - Scheduling

You wrote this pod spec with pod anti-affinity but pods are still scheduled on the same node. What is the likely error?

affinity:
  podAntiAffinity:
    preferredDuringSchedulingIgnoredDuringExecution:
    - weight: 100
      podAffinityTerm:
        labelSelector:
          matchLabels:
            app: myapp
        topologyKey: "kubernetes.io/hostname"

AIncorrect labelSelector syntax causes failure

BMissing nodeSelector in the pod spec

CUsing preferred instead of required anti-affinity allows scheduling on same node

DtopologyKey should be set to "zone" instead of hostname

Step-by-Step Solution

Solution:

Step 1: Understand pod anti-affinity types
Preferred anti-affinity suggests avoiding co-location but does not enforce it strictly. Required anti-affinity enforces pods not to be scheduled together.
Step 2: Analyze the pod spec anti-affinity type
The spec uses preferredDuringSchedulingIgnoredDuringExecution, which is a soft rule. This allows pods to be scheduled on the same node if needed.
Final Answer:
Using preferred instead of required anti-affinity allows scheduling on same node -> Option C
Quick Check:
Preferred anti-affinity is a soft rule [OK]

Quick Trick: Preferred anti-affinity is soft; use required to enforce [OK]

Common Mistakes:

Confusing preferred and required anti-affinity
Assuming labelSelector syntax is wrong without checking
Thinking topologyKey must be zone for anti-affinity

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You wrote this pod spec with pod anti-affinity but pods are still scheduled on the same node. What is the likely error?

Step 1: Understand pod anti-affinity types

Step 2: Analyze the pod spec anti-affinity type

Final Answer:

Quick Check:

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