Merge pull request #26840 from mltsy/patch-1

Clarify sources of voluntary disruptions
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Kubernetes Prow Robot 2021-05-16 05:53:59 -07:00 committed by GitHub
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@ -80,12 +80,14 @@ Here are some ways to mitigate involuntary disruptions:
[multi-zone cluster](/docs/setup/multiple-zones).) [multi-zone cluster](/docs/setup/multiple-zones).)
The frequency of voluntary disruptions varies. On a basic Kubernetes cluster, there are The frequency of voluntary disruptions varies. On a basic Kubernetes cluster, there are
no voluntary disruptions at all. However, your cluster administrator or hosting provider no automated voluntary disruptions (only user-triggered ones). However, your cluster administrator or hosting provider
may run some additional services which cause voluntary disruptions. For example, may run some additional services which cause voluntary disruptions. For example,
rolling out node software updates can cause voluntary disruptions. Also, some implementations rolling out node software updates can cause voluntary disruptions. Also, some implementations
of cluster (node) autoscaling may cause voluntary disruptions to defragment and compact nodes. of cluster (node) autoscaling may cause voluntary disruptions to defragment and compact nodes.
Your cluster administrator or hosting provider should have documented what level of voluntary Your cluster administrator or hosting provider should have documented what level of voluntary
disruptions, if any, to expect. disruptions, if any, to expect. Certain configuration options, such as
[using PriorityClasses](https://kubernetes.io/docs/concepts/configuration/pod-priority-preemption/)
in your pod spec can also cause voluntary (and involuntary) disruptions.
## Pod disruption budgets ## Pod disruption budgets