ScaleWebApp.ps1
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<#PSScriptInfo .VERSION 1.0.0 .GUID 87567e3f-8e2b-4170-9d6b-c1d3576a4b88 .AUTHOR Umais Khan .COMPANYNAME Sakura Software .COPYRIGHT © 2024 Sakura Software. All rights reserved. .TAGS Azure, Automation, WebApp, Scaling, AzureAutomation .LICENSEURI https://opensource.org/licenses/MIT .PROJECTURI https://github.com/maisyk/Scale-Azure-App-Service .ICONURI .EXTERNALMODULEDEPENDENCIES Az.Accounts, Az.Websites .REQUIREDSCRIPTS .EXTERNALSCRIPTDEPENDENCIES .RELEASENOTES - Initial release for scaling Azure Web App using Azure Automation. .PRIVATEDATA #> <# .SYNOPSIS Vertically scale up or down an Azure Web App .DESCRIPTION This Azure Automation runbook enables vertical scaling of an Azure Web App. You can use this script to increment up or down by 1 instance per run. .PARAMETER resourceGroupName Name of the resource group to which the service plan is assigned. .PARAMETER appServicePlan Azure App Service Plan name (case sensitive). .PARAMETER ScaleDirection Specify 'up' to scale up or 'down' to scale down. .PARAMETER MinInstanceCount Minimum number of instances to maintain when scaling. .EXAMPLE .\ScaleWebApp.ps1 -resourceGroupName "myResourceGroup" -appServicePlan "myAppServicePlan" -ScaleDirection "up" -MinInstanceCount 2 .NOTES Author: Umais Khan Last Update: Oct 2024 #> param( [parameter(Mandatory = $true)] [string] $resourceGroupName, [parameter(Mandatory = $true)] [string] $appServicePlan, [parameter(Mandatory = $false)] [ValidateSet('up', 'down')] [string] $ScaleDirection = 'up', [parameter(Mandatory = $false)] [int] $MinInstanceCount = 1 ) # Authenticate using the system-assigned managed identity Connect-AzAccount -Identity # Retrieve the App Service Plan $asp = Get-AzAppServicePlan -ResourceGroupName $resourceGroupName -Name $appServicePlan if (-not $asp) { Write-Error "App Service Plan '$appServicePlan' not found in Resource Group '$resourceGroupName'." exit 1 } # Get the current instance count from Sku.Capacity $currentInstanceCount = $asp.Sku.Capacity Write-Output "Current instance count: $currentInstanceCount" # Determine the new instance count based on the scale direction switch ($ScaleDirection) { 'up' { $newInstanceCount = [Math]::Max($currentInstanceCount + 1, $MinInstanceCount) } 'down' { $newInstanceCount = [Math]::Max($currentInstanceCount - 1, $MinInstanceCount) } Default { Write-Error "Invalid ScaleDirection specified. Use 'up' or 'down'." exit 1 } } # Check if the new instance count is valid if ($newInstanceCount -eq $currentInstanceCount) { Write-Output "Instance count remains at $currentInstanceCount (minimum instance count reached or no change needed)." } else { # Update the App Service Plan with the new instance count Set-AzAppServicePlan -ResourceGroupName $resourceGroupName -Name $appServicePlan -NumberOfWorkers $newInstanceCount Write-Output "Scaled $ScaleDirection to $newInstanceCount instances." } |