How to Switch a VM From Dynamic IP To Static IP Pool in Virtual Machine Manager? #VMM #SCVMM #SysCtr #HyperV

2 Min. Read

Hello folks,

This blog post is meant to show you how you can move a virtual machine from Dynamic IP to static IP Pool in VMM for your virtual machines post deployments.

I deployed recently a virtual machine from VM Templates, however, during the deployment, I missed selecting the IP address to be Static IP (from a static IP Pool).

I ended up with a VM without an IP address.

SNAGHTML5f37dac

A little bit of context about IP Pool in VMM.

An IP Pool is like a DHCP server. There is an IP address range, where you can configure basic options such as a gateway, the suffixes DNS and DNS itself, etc… An IP Pool is associated with a VM Subnet that belongs to a VM network. For each VM Subnet, it is possible to create one or more IP Pool while the IP addresses in the range belong to the VM subnet.

So after the VM is deployed, you cannot change the IP address mode in the UI from Dynamic to Static, the option will be greyed out as shown in the following screenshot.

image

If we click on Connection details… we can see the VM has no IP address assigned.

image

So what is the solution then… PowerShell of course!

By running the following script we can update the IP address from Dynamic to Static IP Pool on the fly while the VM is running.

<#
 .SYNOPSIS
Switch From Dynamic IP To Static IP Pool.

.DESCRIPTION
Switch From Dynamic IP To Static IP Pool in Virtual Machine Manager.

.NOTES
File Name  : Set-SCVMIPAddressMode.ps1
Author     : Charbel Nemnom
Date       : 13-Mar-2021
Version    : 2.0
Requires   : PowerShell Version 3.0 or above, VMM IP Pools defined
OS         : Windows Server 2016 with System Center Virtual Machine Manager 2016

.LINK
To provide feedback or for further assistance, <a href="#respond">please leave a comment below</a>.

.EXAMPLE
./Set-SCVMIPAddressMode -VMMServer <VMMServerName> -VM <VMName>
This example will switch <VMName> from Dynamic IP to Static IP Pool and assign a static IP Address 
#>

[CmdletBinding()]
param(
    [Parameter(Mandatory=$true, HelpMessage='VMM Server Name')]
    [Alias('VMMServer')]
    [String]$VMMServerName,

    [Parameter(Mandatory=$true, HelpMessage='Virtual Machine Name')]
    [Alias('VM')]
    [String]$VMName   
  )

$VM = Get-SCVirtualMachine -Name $VMName

# Select The VM Network  
$VMNetwork = Get-SCVMNetwork -VMMServer $VMMServerName | Out-Gridview -PassThru -Title 'Select VM Network'

# Select the VM Subnet
$VMSubnet = Get-SCVMSubnet -VMMServer $VMMServerName -VMNetwork $VMNetwork | Out-GridView -PassThru -Title 'Select VM Subnet'

# Select the IP Address Pool
$IPPool = Get-SCStaticIPAddressPool -VMMServer $VMMServerName -VMSubnet $VMSubnet | Out-GridView -PassThru -Title 'Select IP Address Pool'

# Select which Virtual NIC you want to apply Static IP Mode
$NIC = Get-SCVirtualNetworkAdapter -VMMServer $VMMServerName -VM $VM.Name | Out-Gridview -PassThru -Title 'Select VMs vNIC'

# Get a free IP address from the IP Pool
$IPAddress = Grant-SCIPAddress -GrantToObjectType VirtualNetworkAdapter -GrantToObjectID $VM.VirtualNetworkAdapters[($NIC.SlotID)].ID -StaticIPAddressPool $IPPool -Description $VM.Name

# Allocate to the vmNIC an IP Address from the IP Pool
Set-SCVirtualNetworkAdapter -VMMServer $VMMServerName -VirtualNetworkAdapter $VM.VirtualNetworkAdapters[($NIC.SlotID)] -VMNetwork $VMNetwork -IPv4AddressType Static -IPv4Addresses $IPAddress.Address
.\Set-SCVMIPAddressMode.ps1 -VMMServerName VMM01 -VMName DEMO-VM

When the job is completed, look back at the VM properties in VMM, we can see the IP address is set to Static IP (from a static IP Pool).

VMM-DYN_SCIPPool-04

Click on Connection details… to check if the VM has an IP address allocated from the IP Pool.

image

And lastly, login to the VM and ensure that these settings are reflected within the guest Operating System as well.

image

That’s it. Have a good one!

Cheers,
-Charbel

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