[Solved] To ensure that no two pods with label app=web are scheduled on the same node, which pod anti-affinity configuration should you use? | Kubernetes

Kubernetes - Scheduling

To ensure that no two pods with label app=web are scheduled on the same node, which pod anti-affinity configuration should you use?

ApodAntiAffinity: requiredDuringSchedulingIgnoredDuringExecution: - labelSelector: matchLabels: app: web topologyKey: "kubernetes.io/hostname"

BpodAffinity: preferredDuringSchedulingIgnoredDuringExecution: - weight: 100 labelSelector: matchLabels: app: web topologyKey: "zone"

CnodeAffinity: requiredDuringSchedulingIgnoredDuringExecution: nodeSelectorTerms: - matchExpressions: - key: app operator: NotIn values: - web

DpodAntiAffinity: preferredDuringSchedulingIgnoredDuringExecution: - weight: 1 labelSelector: matchLabels: app: web topologyKey: "zone"

Step-by-Step Solution

Solution:

Step 1: Understand requirement
Pods with label app=web must never co-locate on the same node.
Step 2: Use pod anti-affinity
Required pod anti-affinity with topologyKey: kubernetes.io/hostname enforces this at node level.
Step 3: Eliminate incorrect options
podAffinity: preferredDuringSchedulingIgnoredDuringExecution: - weight: 100 labelSelector: matchLabels: app: web topologyKey: "zone" uses pod affinity, not anti-affinity. nodeAffinity: requiredDuringSchedulingIgnoredDuringExecution: nodeSelectorTerms: - matchExpressions: - key: app operator: NotIn values: - web uses node affinity incorrectly. podAntiAffinity: preferredDuringSchedulingIgnoredDuringExecution: - weight: 1 labelSelector: matchLabels: app: web topologyKey: "zone" uses preferred anti-affinity which is not guaranteed.
Final Answer:
Option A -> Option A
Quick Check:
Required pod anti-affinity with hostname topologyKey prevents co-location [OK]

Quick Trick: Use required podAntiAffinity with hostname topologyKey to separate pods [OK]

Common Mistakes:

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To ensure that no two pods with label app=web are scheduled on the same node, which pod anti-affinity configuration should you use?