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81 lines
2.8 KiB
Plaintext
81 lines
2.8 KiB
Plaintext
---
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layout: docs
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page_title: Nomad node pool specification
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description: |-
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Learn about Nomad's node pool specification. Review an example node pool specification. Configure description, metadata, and scheduler options.
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---
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# Nomad node pool specification
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Node pools group nodes, letting you restrict which jobs are able to place
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allocations in a given set of nodes. Specify node pools as HCL files and submit
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them with the [`nomad node pool apply`][pool-apply] CLI command. Unlike [job
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specifications][jobspecs], node pool specifications do not support HCL2
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features like functions.
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This example is a node pool specification generated with the [`nomad node pool
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init` command][pool-init].
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```hcl
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node_pool "example" {
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description = "Example node pool"
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# meta is optional metadata on the node pool, defined as key-value pairs.
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# The scheduler does not use node pool metadata as part of scheduling.
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meta {
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environment = "prod"
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owner = "sre"
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}
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# The scheduler configuration options specific to this node pool. This block
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# supports a subset of the fields supported in the global scheduler
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# configuration as described at:
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# https://developer.hashicorp.com/nomad/commands/operator/scheduler/set-config
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#
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# * scheduler_algorithm is the scheduling algorithm to use for the pool.
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# If not defined, the global cluster scheduling algorithm is used.
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#
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# Available only in Nomad Enterprise.
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# scheduler_config {
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# scheduler_algorithm = "spread"
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# }
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}
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```
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Example usage if the above is in a file named `pool.nomad.hcl`:
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```shell-session
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$ nomad node pool apply ./pool.nomad.hcl
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Successfully applied node pool "example"!
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```
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## Parameters
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- `description` `(string: <optional>)` - Sets a human readable description for
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the node pool.
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- `meta` `(map[string]string: <optional>)` - Sets optional metadata on the node
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pool, defined as key-value pairs. The scheduler does not use node pool
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metadata as part of scheduling.
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- `scheduler_config` <code>([SchedulerConfig][sched-config]: nil)</code> <EnterpriseAlert inline /> -
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Sets scheduler configuration options specific to the node pool. If not
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defined, the global scheduler configurations are used.
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### `scheduler_config` parameters <EnterpriseAlert inline />
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- `scheduler_algorithm` `(string: <optional>)` - The [scheduler algorithm][]
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used for this node pool. Must be one of `binpack` or `spread`.
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- `memory_oversubscription_enabled` `(bool: <optional>)` - The [memory
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oversubscription][] setting to use for this node pool.
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[pool-apply]: /nomad/commands/node-pool/apply
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[jobspecs]: /nomad/docs/job-specification
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[pool-init]: /nomad/commands/node-pool/init
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[sched-config]: #scheduler_config-parameters
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[scheduler algorithm]: /nomad/api-docs/operator/scheduler#scheduleralgorithm-1
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[memory oversubscription]: /nomad/api-docs/operator/scheduler#memoryoversubscriptionenabled-1
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