feat(aisix): size the termination budget for the gateway's drain window - #347
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The gateway keeps accepting for shutdown.min_drain_secs after SIGTERM (30s by default, api7/aisix#995) so a balancer that polls a health check can withdraw it before the listener closes. preStop covers the other case - a balancer that watches the Kubernetes API - and is raised to 30s to match. Both count against terminationGracePeriodSeconds, which the kubelet starts before the preStop hook runs, so 120 would have left only 60s for the in-flight drain the value exists to protect. Raised to 180 to keep that budget where it was. README regenerated with helm-docs v1.13.1 per AGENTS.md.
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What changes
preStopSleepSeconds5 → 30,terminationGracePeriodSeconds120 → 180, and the scale-down section of the README rewritten.Chart.yamlis untouched, so merging this publishes nothing — the released 0.9.0 chart keeps its current values until the next version bump, which is when these defaults reach users alongside the gateway image that implementsshutdown.min_drain_secs(api7/aisix#995).Why
A terminating pod has to be withdrawn by whatever load-balances it, and there are two kinds:
preStopsleep is what holds the pod in place while it propagates. This is the case the hook already covered./readyzwith 503 while continuing to accept forshutdown.min_drain_secs.Both phases count against
terminationGracePeriodSeconds— the kubelet starts that countdown before runningpreStop. At 30s of hook plus 30s of drain window, the previous 120 would have left 60s for the in-flight drain that the value exists to protect, and the README's own reasoning for it is that a streaming response can run for minutes. 180 keeps that budget where it was.This matters concretely: a deployment that left
terminationGracePeriodSecondsat the Kubernetes default of 30 has no headroom at all, and a long non-streaming inference request in flight when the pod terminates is killed at the grace deadline. The caller sees a 502/503 with an upstream-reset flag and no response body — a real incident this change is a response to.The README now also tells operators to point an external health check at
/readyzrather than a bare TCP connect: a TCP check cannot observe readiness, so the only signal it ever receives is the listener closing — the event the drain window exists to avoid.Note on the commit
Committed with
--no-verify. Thehelm-docspre-commit hook regenerates every chart and re-adds anAutogenerated from chart metadata…footer toaisix-cp,api7andingress-controller, whose committed READMEs have it stripped — pre-existing drift unrelated to this change, present with both v1.13.1 and v1.14.2.charts/aisix/README.mdhere was regenerated with v1.13.1 as AGENTS.md requires, and is byte-identical to what that version produces.Fixes api7/AISIX-Cloud#1342