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content/en/docs/tasks/run-application/horizontal-pod-autoscale-walkthrough.md

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 - justinsb
 - directxman12
 title: Horizontal Pod Autoscaler Walkthrough
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 weight: 100
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 Horizontal Pod Autoscaler automatically scales the number of pods
 in a replication controller, deployment, replica set or stateful set based on observed CPU utilization
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 This document walks you through an example of enabling Horizontal Pod Autoscaler for the php-apache server.  For more information on how Horizontal Pod Autoscaler behaves, see the [Horizontal Pod Autoscaler user guide](/docs/tasks/run-application/horizontal-pod-autoscale/).
 
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 This example requires a running Kubernetes cluster and kubectl, version 1.2 or later.
 [metrics-server](https://github.com/kubernetes-incubator/metrics-server/) monitoring needs to be deployed in the cluster
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 you must be able to communicate with the API server that provides the external metrics API.
 See the [Horizontal Pod Autoscaler user guide](/docs/tasks/run-application/horizontal-pod-autoscale/#support-for-custom-metrics) for more details.
 
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 ## Run & expose php-apache server
 
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 Autoscaling the replicas may take a few minutes.
 {{< /note >}}
 
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 ## Autoscaling on multiple metrics and custom metrics
 
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 horizontalpodautoscaler.autoscaling/php-apache created
 ```
 
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