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CKA study material · question 725 of 1000

Why does kube-proxy return 503 from /healthz while its node is being deleted?

  1. To make the API server remove the node object faster
  2. So load balancers supporting connection draining stop sending new connections
  3. To signal that the node's iptables rules are corrupt
  4. To trigger eviction of the node's remaining Pods
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Answer: B. So load balancers supporting connection draining stop sending new connections

Failing the readiness check first lets a draining-capable load balancer finish existing connections and refuse new ones before the node is removed from its target set.

Source: Virtual IPs and Service Proxies (Kubernetes) — Traffic policies › External traffic policy

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