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Why does Pod startup time increase when ConfigMaps or Secrets grow large?

Mid Kubernetes
Quick Answer Kubernetes projects ConfigMaps and Secrets into Pods via the API server. Kubelet watches these resources and syncs them into the Pod. Large ConfigMaps mean more data to transfer, more etcd I/O per watch event, and more time for kubelet to process and write files into the container. The sync loop adds latency proportional to data size.

Answer

Large data mounts slow kubelet volume setup and Pod initialization.
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Source: SugharaIQ

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