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--- title: Post-deployment configuration with extensions description: Learn how to use Azure Resource Manager template (ARM template) extensions for post-deployment configurations. ms.topic: article ms.custom: devx-track-arm-template ms.date: 06/26/2026 --- # Post-deployment configurations by using extensions Azure Resource Manager template (ARM template) extensions are small applications that provide post-deployment configuration and automation tasks on Azure resources. The most popular one is virtual machine extensions. See [Virtual machine extensions and features for Windows](/azure/virtual-machines/extensions/features-windows), and [Virtual machine extensions and features for Linux](/azure/virtual-machines/extensions/features-linux). ## Extensions The existing extensions are: - [Microsoft.Compute/virtualMachines/extensions](/azure/templates/microsoft.compute/virtualmachines/extensions) - [Microsoft.Compute virtualMachineScaleSets/extensions](/azure/templates/microsoft.compute/virtualmachinescalesets/extensions) - [Microsoft.HDInsight clusters/extensions](/azure/templates/microsoft.hdinsight/clusters) - [Microsoft.Sql servers/databases/extensions](/azure/templates/microsoft.sql/servers/databases/extensions) - [Microsoft.Web/sites/siteextensions](/azure/templates/microsoft.web/sites/siteextensions) To find out the available extensions, browse to the [template reference](/azure/templates/). In **Filter by title**, enter **extension**. To learn how to use these extensions, see: - [Tutorial: Deploy virtual machine extensions with ARM templates](template-tutorial-deploy-vm-extensions.md). - [Tutorial: Import SQL BACPAC files with ARM templates](template-tutorial-deploy-sql-extensions-bacpac.md) ## Next steps > [!div class="nextstepaction"] > [Tutorial: Deploy virtual machine extensions with ARM templates](template-tutorial-deploy-vm-extensions.md)