PowerCLI script to migrate virtual machines to the new vCenter environment

Hello world

in the next few weeks, we need about migrate 700 VMs (Windows/Linux) server to a new environment (new vCenter, new hosts, but VMs will remain on same data warehouses). VMs will be migrated not in one batch, but rather from time to time (which, however, can understand the need to migrate some 10s of virtual machines at the same time).

Cluster names and folder structure will be identical to the old and the new vCenters. As host in the new vCenter names differ from those in the old vCenter, thought to provide a table of 'translation', which tells the script to save a given VM on host B (new vCenter) when having been registered in order to host a (old vCenter) and so on.

I thought writing a PowerCLI script which, broadly speaking, can accomplish the following steps:

  • Connect to vCenterOld and vCenterNew
  • Correspondence table of host to read from a file (see step "register VM vCenterNew below)

Then, in a loop:

  • Ask VM name
  • Get the settings of the virtual machine: Datastore/path, network/Portgroup, HA restart priority, host, folder, note
  • View the parameters and the VM name and request confirmation migrate the virtual machine
  • Turn off VM (closed OS gracefully, but force power off if power status is still not equal 'off' after a time given)
  • To unsubscribe from VM vCenterOld (removal of inventory)
  • Registry of the VM to the data store vCenterNew (assumptions: same folder as vCenterOld, host names are different, but for each source in vCenterOld host a host of destination in vCenterNew for you join the virtual machine to can be provided, that is, CSV)
  • The value of VM portgroup (same name as in vCenterOld)
  • Set VM HA restart priority
  • PowerON VM
  • Wait / check the VM (for example, ping) connectivity / continue immediately if the virtual machine is accessible or after a certain time if the virtual machine is still inaccessible
  • Confirm that the virtual machine has been migrated successfully, OR ask the user to check the connectivity of the virtual machine

Now to my questions:

  • Is anyone know about an existing script that does something similar or contains parts that can be useful to compile a script like this?
  • How can vCenter two connections at the same time been managed within a PowerCLI script - or doesn't work at all and a connect/disconnect to/from the two vCenters must be completed for each virtual computer?

Many thanks for any help.


The following seems to work for me

$vm = Get-VM -Name MyVM$nic = Get-NetworkAdapter -VM $vm $vdPG = $nic | select -ExpandProperty NetworkName

Get-VDPortgroup -Name $vdPG

Tags: VMware

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