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Mirror pods for static pods may not be created immediately during node startup because either the node is not registered or node informer is not synced. They will be created eventually when static pods are resynced (every 1-1.5 minutes). However, during this delay of 1-1.5 mins, kube-scheduler might overcommit resources to the node and eventually cause kubelet to reject pods with OutOfCPU/OutOfMemory/OutOfPods error. To ensure kube-scheduler is aware of static pod resource usage faster, mirror pods are created as soon as the node registers.