English best practices: high availability #341
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kirkonru
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Dec 7, 2021
alexey-igrychev
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Dec 7, 2021
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| In practice, the liveness probe is not as widely used as you may have thought. Its purpose is to restart a container if, for example, the application is frozen. However, in real life, such app deadlocks are an exception rather than the rule. If the application demonstrates partial functionality for some reason (e.g., it cannot restore connection to a database after it has been broken), you have to fix that in the application, rather than “inventing” livenessProbe-based workarounds. | ||
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| > **Общая рекомендация для всех проб:** выставляйте высокий `timeoutSeconds`. Значение по умолчанию в одну секунду — слишком низкое. Особенно критично для `readinessProbe` и `livenessProbe`. Слишком низкий `timeoutSeconds` будет приводить к тому, что при увеличении времени ответов у приложений в Pod'ах (что обычно происходит для всех Pod'ов сразу благодаря балансированию нагрузки с помощью Service) либо перестанет приходить трафик почти во все Pod'ы (readiness), либо, что ещё хуже, начнутся каскадные перезапуски контейнеров (liveness). |
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