waagent -deprovision+user

$rgName = "VMTestGroup"
$template = "Template-test.json"
$vmName = "VMTest"
$vhdName = "VHDTest"
 
azure vm deallocate -g $rgName -n $vmName
azure vm generalize $rgName -n $vmName
azure vm capture $rgName $vmName $vhdName -t $template
 
# the $template should looks like this. and you have to change 'newvmname' before use.
...
         "storageProfile": {
          "dataDisks": [
            {
              "caching": "ReadOnly",
              "vhd": {
                "uri": "https://yourdiskname.blob.core.windows.net/vhds/dataDisk-0.newvmname.vhd"
              },
              "image": {
                "uri": "https://yourdiskname.blob.core.windows.net/system/Microsoft.Compute/Images/vhds/yourcapturedvmname-dataDisk-0.ff60129b-...3cf59bf9315a.vhd"
              },
              "createOption": "FromImage",
              "name": "yourcapturedvmname-dataDisk-0.ff60129b-4ec5-4dcd-ae97-3cf59bf9315a.vhd",
              "lun": 0
            }
          ],
          "osDisk": {
            "caching": "ReadWrite",
            "vhd": {
              "uri": "https://yourdiskname.blob.core.windows.net/vhds/osDisk.newvmname.vhd"
            },
            "image": {
              "uri": "https://yourdiskname.blob.core.windows.net/system/Microsoft.Compute/Images/vhds/yourcapturedvmname-osDisk.ff60129b-...3cf59bf9315a.vhd"
            },
            "createOption": "FromImage",
            "name": "yourcapturedvmname-osDisk.ff60129b-4ec5-4dcd-ae97-3cf59bf9315a.vhd",
            "osType": "Linux"
          }
        },
...
 
 
azure group deployment create $rgName MyDeployment -f Template-test-modified.json
    info:    Executing command group deployment create
    info:    Supply values for the following parameters
    vmName: NewVmName
    adminUserName: username
    adminPassword: password
    networkInterfaceId: /subscriptions/61719d1b-...ab74b6f77865/resourceGroups/VMTestGroup/providers/Microsoft.Network/networkInterfaces/YourNetworkInterfaceName
 
#If you do not have an existing NetworkInterface, you need create first. 
azure network nic create $rgName YourNetworkInterfaceName -k default -m YourSubnetVnetName  -l "westus2"