Hey Ganesh,
Use Get-VM instead of Get-Content since, by default, Get-VM will return all VMs in the inventory. You can also pass it names or wildcards to get specific VMs. I've also run into some small snags with running Connect-VIServer without error-checking, so you may want to throw something like this in:
## Disconnect all viServer instances so we don't get duplicate results.
Write-Host "Checking for unclosed vCenter Connections..." -noNewLine
try{
# We don't want a previous connection because it will cause duplicate entries later on.
Disconnect-VIServer * -confirm:$false
# Run it again just in case it missed one or there were already multiple connections.
Disconnect-VIServer * -confirm:$false
}
catch{
# Nothing to do here since there were no servers to disconnect from.
Write-Host -foregroundColor Green "[Done]"
}
## Attempt to connect to the vCenter Server
Write-Host -foreGroundColor Cyan "`nInitializing Services:"
try{
Write-Host "Connecting to vCenter $vcAddress..." -noNewLine
$vcConnection = Connect-ViServer vmware
Write-Host -foreGroundColor Green "[Done]"
}
catch{
Write-Host -foregroundColor Red -backgroundColor Black "`nCould not authenticate to vCenter"
exit
}
That's something I like to add at the beginning of all my PowerCLI scripts just to make sure I've got a single, clean, connection to vCenter.
Beyond that, you'll want to use Get-VM instead of Get-Content since it's much easier and you can specify VM names including wildcards. Here's a small example of setting up and deleting a snapshot for a VM:
function createSnapshot($vm){
try{
Write-Host "Creating new snapshot for $vm"
Get-VM $vm | New-Snapshot -name "$vm Daily Snap" -description "Created with Snapshot Manager.ps1" -memory:$false -quiesce:$false -confirm:$false
Write-Host -foregroundcolor "Green" "`nDone."
}
catch{
Write-Host -foregroundcolor RED -backgroundcolor BLACK "Error creating new snapshot. See VCenter log for details."
}
}
function removeSnapshot($vm){
try{
Write-Host "Previous snapshot detected, removing first..."
Get-VM $vm | Get-Snapshot -name $snapshot | Remove-Snapshot -confirm:$false
Write-Host -foregroundcolor "Green" "`nDone."
}
catch {
Write-Host -foregroundcolor RED -backgroundcolor BLACK "Error deleting old snapshot. See VCenter log for details."
break
}
}
In combination with those above functions, you can run a for-loop for each VM. Here's a quick example that will grab all my VM's who's names begin with "vm-", deletes any current snapshots and creates a new one:
$vmList = Get-VM "vm-*"
forEach ($vm in $vmList) {
$snapshot = Get-VM $vm | Get-Snapshot | Select-Object -expandProperty name
if ($snapshot -eq "" -or $snapshot -eq $null){
#No snapshots, create one at top level.
createSnapshot($vm)
}
else {
#Snapshot Exists, remove before continuing.
removeSnapshot($vm)
createSnapshot($vm)
}
}
Hope this helps! 