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@@ -4,10 +4,10 @@ reviewers:
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- filipg
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- piosz
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title: Guaranteed Scheduling For Critical Add-On Pods
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content_template: templates/concept
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content_type: concept
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---
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{{% capture overview %}}
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<!-- overview -->
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In addition to Kubernetes core components like api-server, scheduler, controller-manager running on a master machine
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there are a number of add-ons which, for various reasons, must run on a regular cluster node (rather than the Kubernetes master).
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@@ -19,14 +19,14 @@ vacated by the evicted critical add-on pod or the amount of resources available
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Note that marking a pod as critical is not meant to prevent evictions entirely; it only prevents the pod from becoming permanently unavailable.
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For static pods, this means it can't be evicted, but for non-static pods, it just means they will always be rescheduled.
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{{% /capture %}}
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{{% capture body %}}
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<!-- body -->
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### Marking pod as critical
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To mark a Pod as critical, set priorityClassName for that Pod to `system-cluster-critical` or `system-node-critical`. `system-node-critical` is the highest available priority, even higher than `system-cluster-critical`.
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{{% /capture %}}
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