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Clarify resource calculations in NodeUtilization strategy Readmes

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This adds text explaining the resource calculation in LowNodeUtilization and HighNodeUtilization
This commit is contained in:
Mike Dame
2022-01-30 12:42:42 -05:00
parent afb1d75ce1
commit c51c066cd1
1 changed files with 12 additions and 0 deletions
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README.md
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@@ -218,6 +218,12 @@ These thresholds, `thresholds` and `targetThresholds`, could be tuned as per you
strategy evicts pods from `overutilized nodes` (those with usage above `targetThresholds`) to `underutilized nodes`
(those with usage below `thresholds`), it will abort if any number of `underutilized nodes` or `overutilized nodes` is zero.
**NOTE:** Node resource consumption is determined by the requests and limits of pods, not actual usage.
This approach is chosen in order to maintain consistency with the kube-scheduler, which follows the same
design for scheduling pods onto nodes. This means that resource usage as reported by Kubelet (or commands
like `kubectl top`) may differ from the calculated consumption, due to these components reporting
actual usage metrics. Implementing metrics-based descheduling is currently TODO for the project.
**Parameters:**
|Name|Type|
@@ -285,6 +291,12 @@ strategy evicts pods from `underutilized nodes` (those with usage below `thresho
so that they can be recreated in appropriately utilized nodes.
The strategy will abort if any number of `underutilized nodes` or `appropriately utilized nodes` is zero.
**NOTE:** Node resource consumption is determined by the requests and limits of pods, not actual usage.
This approach is chosen in order to maintain consistency with the kube-scheduler, which follows the same
design for scheduling pods onto nodes. This means that resource usage as reported by Kubelet (or commands
like `kubectl top`) may differ from the calculated consumption, due to these components reporting
actual usage metrics. Implementing metrics-based descheduling is currently TODO for the project.
**Parameters:**
|Name|Type|