Linter rule - use stable VM image

  • Article

Virtual machines shouldn't use preview images. This rule checks the following properties under "imageReference" and fails if any of them contain the string "preview":

  • offer
  • sku
  • version

Linter rule code

Use the following value in the Bicep configuration file to customize rule settings:

use-stable-vm-image

Solution

The following example fails this test.

resource vm 'Microsoft.Compute/virtualMachines@2020-06-01' = {
  name: 'virtualMachineName'
  location: resourceGroup().location
  properties: {
    storageProfile: {
      imageReference: {
        offer: 'WindowsServer-preview'
        sku: '2019-Datacenter-preview'
        version: 'preview'
      }
    }
  }
}

You can fix it by using an image that does not contain the string preview in the imageReference.

resource vm 'Microsoft.Compute/virtualMachines@2020-06-01' = {
  name: 'virtualMachineName'
  location: resourceGroup().location
  properties: {
    storageProfile: {
      imageReference: {
        offer: 'WindowsServer'
        sku: '2019-Datacenter'
        version: 'latest'
      }
    }
  }
}

Next steps

For more information about the linter, see Use Bicep linter.