Inconsistent functionality between Azure CLI and Powershell cmdlet

Question

I tried to create 2 virtual machines with the same parameters but with 2 different ways:

1. The Powershell cmdlet:

   New-AzVm -ResourceGroupName $rg -Name "Testing1img" -Credential $credential -Image UbuntuLTS
   

2. Azure CLI from Powershell:

   az vm create `
     --name "Testing2img" `
     --resource-group $rg `
     --admin-username $credential.UserName `
     --admin-password $credential.Password `
     --image "UbuntuLTS"
   

Both create an Ubuntu LTS VM on the same resource group (different name). The problem I have is that they create VMs with slightly different settings.

In the first case it creates:

• an Ubuntu 16.04 Linux
• DNS name is being assigned

In the second case we have:

• an Ubuntu 18.04 Linux
• No Dns name is being configured

Why these (even small) differences? Shouldn't they both create the same exact VMs? Someone asking for an UbuntuLTS would expect the latest available image and not 16.04.

Answer 1

For New-AzVM you can specify the Ubuntu version with... -Image Canonical:UbuntuServer:18.04-LTS:latest