Answer
Cordon, drain, and PDB ensure Pods migrate safely before reboot.
Quick Answer
For node reboots during upgrades, use kubectl drain to cordon the node (stop new scheduling), evict existing Pods gracefully (respecting PDBs), perform maintenance, then uncordon to bring it back. PDB prevents draining from taking down more replicas than you can afford to lose. Tools like kured automate this process for kernel upgrades requiring reboots.
S
SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
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Source: SugharaIQ