When creating a new VM you have code to set a credential, set an OS type and select a base image. For example:
To use an existing disk replace all of the above with:
Note you still set variables for the disk name, caching and location but the attach create option is used instead of fromImage.
Source: https://www.itprotoday.com/iaaspaas/use-existing-vhd-azurerm-vm
$osDiskName = $vmname+'_osDisk'
$osDiskCaching = 'ReadWrite'
$osDiskVhdUri = "https://$stoname.blob.core.windows.net/vhds/"+$vmname+"_os.vhd"
# Setup OS & Image
$user = "localadmin"
$password = 'Pa55word5'
$securePassword = ConvertTo-SecureString $password -AsPlainText -Force
$cred = New-Object System.Management.Automation.PSCredential ($user, $securePassword)
$vm = Set-AzureRmVMOperatingSystem -VM $vm -Windows -ComputerName $vmname -Credential $cred
$vm = Set-AzureRmVMSourceImage -VM $vm -PublisherName $AzureImage.PublisherName -Offer $AzureImage.Offer `
-Skus $AzureImage.Skus -Version $AzureImage.Version
$vm = Set-AzureRmVMOSDisk -VM $vm -VhdUri $osDiskVhdUri -name $osDiskName -CreateOption fromImage -Caching $osDiskCachingTo use an existing disk replace all of the above with:
$osDiskName = $vmname+'_osDisk'
$osDiskCaching = 'ReadWrite'
$osDiskVhdUri = "https://$stoname.blob.core.windows.net/vhds/"+$vmname+"_os.vhd"
$vm = Set-AzureRmVMOSDisk -VM $vm -VhdUri $osDiskVhdUri -name $osDiskName -CreateOption attach -Windows -Caching $osDiskCachingNote you still set variables for the disk name, caching and location but the attach create option is used instead of fromImage.
Source: https://www.itprotoday.com/iaaspaas/use-existing-vhd-azurerm-vm
