You applied the taint key=value:NoSchedule to a node, but pods without tolerations are still scheduling on it. What is the most likely cause?

medium📝 Troubleshoot Q14 of 15

Kubernetes - Scheduling

You applied the taint key=value:NoSchedule to a node, but pods without tolerations are still scheduling on it. What is the most likely cause?

APods have tolerations matching the taint

BTaints do not affect scheduling

CThe node is in a NotReady state

DThe taint was applied with a typo in the key or value

Step-by-Step Solution

Solution:

Step 1: Check taint correctness
If pods without tolerations schedule on a tainted node, the taint might have a typo or was not applied correctly.
Step 2: Evaluate other options
Pods have tolerations matching the taint means pods tolerate the taint, which contradicts the question. The node is in a NotReady state is unrelated to taints. Taints do not affect scheduling is false because taints do affect scheduling.
Final Answer:
The taint was applied with a typo in the key or value -> Option D
Quick Check:
Incorrect taint syntax causes scheduling errors = B [OK]

Quick Trick: Check taint spelling carefully if pods ignore it [OK]

Common Mistakes:

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