AWS EC2 AMI and snapshot removal - with awesome stuff from @mdjx https://xkln.net/blog/powershell-7-foreach-object-parallel-memory-consumption/

imaegs-and-snaps-ps7.ps1

Set-AWSCredential -ProfileName myprofile
Set-DefaultAWSRegion -Region ap-east-1

$images = Get-EC2Image -Owner self -Verbose

# Our parallel processing code is now inside a function that takes start end end array indexes as parameters
function ProcessFiles([int]$FromIndex, [int]$ToIndex) {
    $images[$FromIndex..$ToIndex] | Where-Object {$_.CreationDate -Like "2020-04*"} | ForEach-Object -ThrottleLimit 6 -Parallel {
        Write-Output -InputObject "Image $($_.ImageId) $($_.CreationDate) $($_.Name)"
        Unregister-EC2Image -ImageId $($_.ImageId) -Verbose
    }
}

$FromIndex = 0      # Arrays start at 0
$ToIndex = 1499     # Our initial batch goes to index 1499
$Increment = 1500   # We increment each batch by 1500 items
$End = $false       # Bool for whether we're at the end of the images array
$LastItemIndex = $images.count - 1  # The index of the last item in the array

do {
    
    Write-Host "[+] Processing AMIs from $FromIndex to $ToIndex" -ForegroundColor Green
    ProcessFiles -FromIndex $FromIndex -ToIndex $ToIndex

    Write-Host "[+] Running Garbage Collection" -ForegroundColor Red
    [system.gc]::Collect() # Manual garbage collection following parallel processing of a batch

    # We increment the FromIndex and ToIndex variables to set them for the next batch
    $FromIndex = $ToIndex + 1
    $ToIndex = $ToIndex + $Increment

    # If the ToIndex value exceeds the index of the last item of the array, we set it to the last item 
    # and flip the $End flag to end batch processing. 
    if ($ToIndex -ge $LastItemIndex) {
        $ToIndex = $LastItemIndex
        $End = $true
    }

} while ($End -ne $true)

images-and-snaps.ps1

Set-AWSCredential -ProfileName myprofile
Set-DefaultAWSRegion -Region ap-east-1

$images = Get-EC2Image -Owner self -Verbose

$images `
  | Where-Object {$_.Description -like "*21go*" -and $_.CreationDate -Like "2020-05-02T02:*"} `
  | Sort-Object -Property CreationDate -Descending `
  | Format-Table -Property CreationDate, ImageId, Description | Select -First 10

$images | Where-Object {$_.CreationDate -Like "2020-03*"} | ForEach-Object -ThrottleLimit 30 -Parallel {
    Write-Output -InputObject "Image: $($_.ImageId) $($_.CreationDate)"
    Unregister-EC2Image -ImageId $($_.ImageId) -Verbose
}

 # Remove 2020 March AMIs

$snaps = Get-EC2Snapshot -OwnerId self -Verbose

$snaps | Where-Object {$_.StartTime -gt (Get-Date -Date "1 Feb 2020")} # Show Snapshots after 1 Feb 2020

($snaps | Where-Object {$_.StartTime -lt (Get-Date -Date "1 Mar 2020")}) | Remove-EC2Snapshot # Remove Snapshots dated before 1 Jan 2020