Kubernetes - Scheduling
Why might a DaemonSet pod fail to run on a node even if the node matches the nodeSelector labels?
Why might a DaemonSet pod fail to run on a node even if the node matches the nodeSelector labels?
hard📝 Conceptual Q10 of 15
Step-by-Step Solution
Solution:
Step 1: Understand taints and tolerations
Nodes can have taints that prevent pods from scheduling unless pods have matching tolerations.Step 2: Identify cause of pod not running
If nodeSelector matches but pod does not tolerate node taints, pod will not run on that node.Final Answer:
The node has a taint that the pod does not tolerate -> Option AQuick Check:
Node taints block pods without tolerations [OK]
Quick Trick: Pods must tolerate node taints to run on tainted nodes [OK]
Common Mistakes:
- Ignoring node taints when pods fail to schedule
- Blaming pod image size for scheduling failure
- Confusing missing selector with scheduling issues
Master "Scheduling" in Kubernetes
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