kubernetes
6 minKubernetes disruption budgets: protect capacity, not every failure
Understand eviction admission, readiness accounting, and why a drain can correctly refuse to proceed.
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Q&A
Q&AWhy can a Kubernetes drain be blocked by a healthy-looking deployment?
Eviction permission depends on the budget and observed ready capacity.
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A PDB can reject supported voluntary eviction when too few healthy selected pods would remain. It does not prevent node failures, guarantee replacement capacity, or govern every controller deletion.
Q&A
Q&AWhat changes with acks=all and min.insync.replicas=2 during a broker partition?
The producer may reject writes when fewer than two replicas remain in the in-sync set.
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With three brokers and min.insync.replicas=2, acks=all requires the current in-sync replica set to meet the minimum. If the ISR falls to one, writes are rejected rather than acknowledged with reduced replication. acks=1 favors availability but risks losing leader-only writes if that leader fails before replication.