Migrate Virtual Machines (VM) to a Virtual Distribututed Switch

Migrate-VMToVDSwitch.ps1

$vmhost = 'esxi-01.domain.local'
$virtual_machines = Get-VM -Location $vmhost
$vcenter = 'vcenter.domain.local'
$vcenter_user = 'administrator@vsphere.local'
# Save an encrypted password to a file and retrieve it later for use in a script
# Read-Host -AsSecureString | ConvertFrom-SecureString | Out-File password.txt
$vcenter_password = Get-Content 'Distributed Switch Migration\password.txt' | ConvertTo-SecureString

if(-not $global:DefaultVIServers) {
    $creds = New-Object -TypeName System.Management.Automation.PSCredential -ArgumentList $vcenter_user, $vcenter_password
    Connect-VIServer $vcenter -Credential $creds
}

Start-Transcript -Path 'distributed_switch_migration.txt'

foreach ($vm in $virtual_machines) { 
    $virtual_nics = Get-NetworkAdapter -VM $vm
        foreach ($vnic in $virtual_nics){
            Write-Host "Migrating virtual machine '$($vm.Name)' network adapter '$($vnic.Name)' ... " -NoNewline
            $dist_pg = Get-VDPortgroup -name $vnic.NetworkName -ErrorAction SilentlyContinue
            if ($dist_pg){
                $result = Set-NetworkAdapter -NetworkAdapter $vnic -PortGroup $dist_pg -Confirm:$false
                if ($result) {
                    Write-Host "success"
                } else {
                    Write-Host "fail"
                }
            } else {
                Write-Host "fail"
                Write-Host "`nDistributed port group '$($vnic.NetworkName)' does not exist ($($vm.Name))`n" -ForegroundColor 'Red'
            }
    }

}

Stop-Transcript