Migrating distributed vSwitch to new vCenter

[raymcdonald]

Hi All,

So I have been using these great scripts from.

http://www.gabesvirtualworld.com/migrating-distributed-vswitch-to-new-vcenter/

They work great, but I need to know if I can change the value to Get-Cluster instead of Get-Datacenter, I am trying to run this against some clusters and the script runs against the datacenter level.

I will be doing some testing but I wanted to see what others have to say about this.

Thanks

[LucD]

If you look at the Network Inventory in the vSPhere client, you'll notice that dvSwitches are defined in the hidden "network" folder that is in the root of each datacenter. A dvSwitch is defined on the level of the datacenter.

What you could do to limit it to a specific cluster, is look at which ESXi are connected to a specific dvSwitch. And from these ESXi you are able to retrieve the cluster these ESXi belong to.

[raymcdonald]

How would I do that, using code, I am pretty new at PowerCLI.

[LucD]

The following code should return the clusters that have hosts connected to a specific vdSwitch

$tgtVDS = "MyVDS"
 
$vds = Get-VDSwitch | where {$_.Name -eq $tgtVDS}
$esxNames = @()
$vds.ExtensionData.Config.Host | %{
    $esxNames += Get-View $_.Config.Host | Select -ExpandProperty Name
}

Get-VMHost -Name $esxNames | Get-Cluster  | Select Name

[raymcdonald]

Well I already know which clusters are connected to the vDswitch, the issue is that all the hosts are connected to one vDswitch and I just want to migrate say four hosts in one cluster, will this still work?

Thanks

[LucD · Accepted solution]

You will have to disconnect those 4 ESXi hosts from the vdSwitch before migrating I suspect.

You can use the Remove-VDSwitchVMHost cmdlet for that.

[markdjones82]

Ray,

  Not exactly what you are doing but might give you an example of how to move a host.  THis script I created will migrate our 2 interfaces from a DVswitch back to a standard and then reregister at a new Vcenter.

This will put host in maint mode, but you could remove that part and do a disconnect/remove instead after you've done your migrate VM's to standard switch.  I do hardcode the 2 vcenter names in a couple spots in the script where you would want to modify for your 2 vcenters. So you might have to tailor it to your needs.

You could do a txt list with all the host names example:

$hosts = get-content hostlist.txt

foreach ($vmhost in $hosts) {

   Migrate_Host -VMHost $VMhost -VDSwitch "switchname"

}

function Migrate_Host {
param (
[Parameter(Mandatory=$true)][string]$VMHost,
[Parameter(Mandatory=$true)][string]$VDSwitch)
 

#Get Credentials to pass to Connect
$credential = Get-Credential -Message "Please enter your credentials"

#Connect to old Vcenter
Connect-VIServer vcenter01 -Credential $credential

#Set host into maintenance mode
Set-VMHost -VMHost $VMHost -State Maintenance -Evacuate -Confirm:$false

#Get VMhost object data
$VMHostobj = Get-VMHost $VMHost

#Remove Vmnic1 adapter from VDS
$VMhostObj | Get-VMHostNetworkAdapter -Physical -Name vmnic1 | Remove-VDSwitchPhysicalNetworkAdapter -Confirm:$false

#Wait till it is removed
Start-Sleep -S 5

#Add Physical nic to Standard Switch
Get-VirtualSwitch -VMhost $VMHost -name "vSwitch0" | Set-VirtualSwitch -Nic "vmnic1" -Confirm:$false

#Set network ID object for Standard Switch
$networkid = $VMHostObj.ExtenSionData.Configmanager.NetworkSystem

# ------- AddPortGroup ------- for VMotion

$portgrp = New-Object VMware.Vim.HostPortGroupSpec
$portgrp.name = "VMotion"
$portgrp.vlanId = 3721
$portgrp.vswitchName = "vSwitch0"
$portgrp.policy = New-Object VMware.Vim.HostNetworkPolicy

$_this = Get-View -Id $networkid
$_this.AddPortGroup($portgrp)



# ------- UpdateVirtualNic ------- for Vmotion

$nic = New-Object VMware.Vim.HostVirtualNicSpec
$nic.portgroup = "VMotion"

$_this = Get-View -Id $networkid
$_this.UpdateVirtualNic("vmk1", $nic)

# ------- AddPortGroup ------- for Management

$portgrp = New-Object VMware.Vim.HostPortGroupSpec
$portgrp.name = "Management"
$portgrp.vlanId = 0
$portgrp.vswitchName = "vSwitch0"
$portgrp.policy = New-Object VMware.Vim.HostNetworkPolicy

$_this = Get-View -Id $networkid
$_this.AddPortGroup($portgrp)



# ------- UpdateVirtualNic ------- for Management

$nic = New-Object VMware.Vim.HostVirtualNicSpec
$nic.portgroup = "Management"

$_this = Get-View -Id $networkid
$_this.UpdateVirtualNic("vmk0", $nic)

#Remove 2nd nic from the VDS
$VMhostObj | Get-VMHostNetworkAdapter -Physical -Name vmnic0 | Remove-VDSwitchPhysicalNetworkAdapter -Confirm:$false

Start-Sleep -s 5

#Move both interfaces to standard switch
Get-VirtualSwitch -VMHost $VMHost -name "vSwitch0" | Set-VirtualSwitch -Nic "vmnic0","vmnic1" -Confirm:$false

#Remove host from VDswitch
Get-VDSwitch | Where {$_.Name -eq $VDSwitch} | Remove-VDSwitchVMHost -VMhost $VMHost -Confirm:$false


#If remove from VDS successful Remove host from Vcenter

if ($?) {
    Start-Sleep -s 5
    Remove-VMHost -VMHost $VMHost -Confirm:$false
    Disconnect-VIServer vcenter01 -Confirm:$false
    Start-Sleep -s 5
    #Connect to new Vcenter and add host to cluster
    Connect-VIServer vcenter02 -Credential $credential
    #add transport host
    Add-VMHost -Name $VMHost -Location "Cluster1" -User root -Password "pass"-Force -Confirm:$false

    } 
   else {
    exit 
    } 
}