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docs: add empty_ignore_system node selector strategy for autoscaling (#10306)

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Luiz Aoqui
2021-04-06 13:02:56 -04:00
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parent 3f4b175cd4
commit 6caee502bf
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website/content/docs/autoscaling/internals/node-selector-strategy.mdx
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@@ -36,6 +36,17 @@ perform the scaling action.
The `empty` strategy is ideal for batch workloads, ensuring allocations are not
interrupted by scaling.
~> **Note:** [system][system_scheduler] jobs will prevent this strategy from
scaling-in nodes. Please use the [`empty_ignore_system`](#empty_ignore_system)
strategy if you have system jobs in your cluster.
### `empty_ignore_system` Node Selector Strategy
The `empty_ignore_system` strategy is similar to `empty`, but it will not
consider allocations from [system][system_scheduler] jobs. A node with only
terminal allocations and allocations from system jobs is considered empty under
this strategy.
### `newest_create_index` Node Selector Strategy
The `newest_create_index` strategy is the simplest strategy and uses the order
@@ -45,3 +56,4 @@ due to scaling. It is also the least computationally intensive selector strategy
[nomad_api_terminal_alloc]: https://github.com/hashicorp/nomad/blob/14568b3e002868fc5c83ee7d158a78394c1ea9c1/api/allocations.go#L422-L442
[nomad_api_node_stub_sort]: https://github.com/hashicorp/nomad/blob/14568b3e002868fc5c83ee7d158a78394c1ea9c1/api/nodes.go#L797-L810
[system_scheduler]: /docs/schedulers#system