To meet requirements for governance, security, and patches at your site, you may need to build customized images of ArcGIS Enterprise instead of using the images that Esri provides in the Azure Marketplace. You can use Packer templates to create these custom images.
Packer is an open source tool by HashiCorp for creating identical machine images typically used in cloud environments. Packer templates are available on GitHub. Use these templates to build virtual machine images that you can use with ArcGIS Enterprise Cloud Builder for Microsoft Azure.