44 lines
2.2 KiB
Plaintext
44 lines
2.2 KiB
Plaintext
---
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layout: docs
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page_title: Autoscaling
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sidebar_title: Autoscaling
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description: |-
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Overview of the Nomad Autoscaler that provides horizontal application and
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cluster scaling.
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---
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# Nomad Autoscaler Overview
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This section details the Nomad Autoscaler, a horizontal application and cluster
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autoscaler for Nomad. The Nomad Autoscaler is built and released separately to
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Nomad. The source code can be viewed on [GitHub][autoscaler_github] and releases
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are available on the [HashiCorp releases page][autoscaler_releases] or via
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[Docker Hub][autoscaler_dockerhub].
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The Nomad Autoscaler repository includes a number of [demos][autoscaler_demo]
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which provide guided learning on running the autoscaler.
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## Horizontal Application Autoscaling
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Horizontal application autoscaling is the process of automatically controlling the number of instances of an application
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to have sufficient work throughput to meet service-level agreements (SLA). In
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Nomad, horizontal application autoscaling can be achieved by modifying the number
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of allocations in a task group based on the value of a relevant metric, such as
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CPU and memory utilization or number of open connections. This is enabled by configuring
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[autoscaling policies][autoscaling_policy] on individual Nomad jobs using the [`scaling` block][scaling_block].
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## Horizontal Cluster Autoscaling
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Horizontal cluster autoscaling is the process of adding or removing Nomad clients from a cluster to ensure there
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is an appropriate amount of cluster resource for the scheduled applications.
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This is achieved by interacting with remote providers to start or terminate new
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Nomad clients based on metrics such as the remaining free schedulable CPU or memory.
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Cluster scaling is enabled by configuring the [autoscaler agent](/docs/autoscaling/agent#dir)
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with policies targeting the Nomad cluster.
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[scaling_block]: /docs/job-specification/scaling
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[autoscaling_policy]: /docs/autoscaling/policy
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[autoscaler_github]: https://github.com/hashicorp/nomad-autoscaler
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[autoscaler_releases]: https://releases.hashicorp.com/nomad-autoscaler/
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[autoscaler_dockerhub]: https://hub.docker.com/r/hashicorp/nomad-autoscaler
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[autoscaler_demo]: https://github.com/hashicorp/nomad-autoscaler/tree/master/demo
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