kubernetes/ingress-nginx

Zero downtime upgrade

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#6,928 建立於 2021年3月4日

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描述

Docs (https://github.com/kubernetes/ingress-nginx/tree/master/charts/ingress-nginx#upgrading-with-zero-downtime-in-production) are mentioning that by default during an upgrade there is a service interruption caused by pods being restarted, and another article is linked with explanation how one can fix that.

But when looking at values.yml I can see both terminationGracePerios and preStop hook is set correctly in order to drain connections.

https://github.com/kubernetes/ingress-nginx/blob/a7fb791132a0dee285b47d0041f4f9acf1e7cff8/charts/ingress-nginx/values.yaml#L237

https://github.com/kubernetes/ingress-nginx/blob/a7fb791132a0dee285b47d0041f4f9acf1e7cff8/charts/ingress-nginx/values.yaml#L583-L587

Is the documentation a little bit outdated or there is something else that I should set to get near zero downtime upgrades?

貢獻者指南

技術棧
gokubernetesdocker
領域
devopsinfrastructurecloud
議題類型
documentation
難度面向新貢獻者的預計實作難度，1 表示很小改動，5 表示專家級工作。
4
預計時間有經驗貢獻者完成調查、實作、測試並準備 pull request 的粗略時間範圍。
1-2 days
活動狀態議題目前的可參與程度：新鮮、活躍、陳舊、阻塞或等待維護者輸入。
stale
清晰度議題是否清楚說明預期改動、驗收標準和下一步。
clear
前置要求
basic kubernetes knowledgehelm chart configurationunderstanding of pod lifecycle hooks
新手友善度1-100 的估計分數，表示該議題對首次貢獻者的友善程度。
30
研究方向
Investigate the helm chart values for terminationGracePeriodSeconds and preStop hook in ingress nginx (see values.yaml lines 237, 583-587). Compare with the linked documentation on zero downtime upgrades. Determine if the documentation is outdated or if additional configuration is needed. Check the referenced article for zero downtime strategies and test the behavior during a rolling update. Consider updating the documentation or values if inconsistencies are found.