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Use a date search to find and delete AWS AMI's and their corresponding disk snapshots
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<# | |
### Resources: ### | |
# How-To Delete Unutilized EBS-Based AMIs And Corresponding Snapshots | |
# http://www.n2ws.com/how-to-guides/how-to-delete-unutilized-ebs-based-amis-and-corresponding-snapshots.html | |
# Deleting Snapshots by Using the AWS Tools for Windows PowerShell | |
# http://docs.aws.amazon.com/storagegateway/latest/userguide/DeletingSnapshotsUsingPowerShell.html | |
# Adding and Removing Items from a PowerShell Array | |
# http://www.jonathanmedd.net/2014/01/adding-and-removing-items-from-a-powershell-array.html | |
#> | |
# Script variables | |
$owner = "self" | |
$pauseTime = 60 | |
# Date search criteria | |
$dateToday = [DateTime]::Now | |
$daysBack = 20 | |
$searchDate = $dateToday.AddDays(-$daysBack) | |
# Create empty collections / arrays for storing AMI and snapshot ID's that meet the date search criteria | |
$instanceAMIs = @() | |
$amiCollection = {$instanceAMIs}.Invoke() | |
$volumeSnapshots = @() | |
$snapshotCollection = {$volumeSnapshots}.Invoke() | |
# Get all of the images owned by this user | |
$server_images = Get-EC2Image -Owner $owner | |
# Search for AMI's by date | |
# Add each of the AMI's that meet the search criteria to the AMI collection | |
foreach ($ami in $server_images) { | |
if ([DateTime]::Compare($searchDate, $ami.CreationDate) -gt 0) { | |
$amiCollection.Add($ami.ImageId) | |
} | |
} | |
# Search for snapshots based on the AMI's returned by the date search | |
# Add each snapshot ID to the snapshot collection | |
foreach ($amiID in $amiCollection) { | |
$instanceImage = Get-EC2Image $amiID | |
$snapshotCount = $instanceImage.BlockDeviceMapping.Count | |
for ($i=0; $i -lt $snapshotCount; $i++) { | |
$snapshotID = $instanceImage[0].BlockDeviceMapping[$i].Ebs | foreach {$_.SnapshotId} | |
$snapshotCollection += $snapshotID | |
} | |
} | |
# Informational message | |
$amiCount = $amiCollection.Count | |
"WARNING: THIS OPERATION WILL DEREGISTER THE FOLLOWING $amiCount AMI's:" | |
$amiCollection | |
"`n" | |
# Deregister each of the AMI's in the AMI collection | |
foreach ($amiID in $amiCollection) { | |
# Uncomment below to deregister AMI's | |
#Unregister-EC2Image $amiID | |
} | |
# Pause the script to allow for AMI unregisteration | |
Start-Sleep $pauseTime | |
# Informational message | |
$snapshotCount = $snapshotCollection.Count | |
"WARNING: THIS OPERATION WILL REMOVE THE FOLLOWING $snapshotCount SNAPSHOTS:" | |
$snapshotCollection | |
# Delete each snapshot in the snapshot collection | |
foreach ($snapshotID in $snapshotCollection) { | |
# Uncomment below to remove snapshots associated with AMI's | |
#Remove-EC2Snapshot $snapshotID -Force | |
} |
@capn0jack Thank you for the comments and update. From what I recall the AMI's that I was working with didn't have ephemeral storage attached, so I didn't account for them or encounter the error that you did. Thank you for posting a fix and link to the blog post!
--Tim
Was very helpful. Thank you :)
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@tjmichael81, Thank you very much for this; it gave me a huge leg up! I did find one problem, though. I noticed right off the bat that sometimes the script would say that there was 1 more snapshot for a particular AMI than there really was. That's because this code returns the ephemeral block devices, as well as the EBS devices:
foreach ($amiID in $amiCollection) { $instanceImage = Get-EC2Image $amiID $snapshotCount = $instanceImage.BlockDeviceMapping.Count for ($i=0; $i -lt $snapshotCount; $i++) { $snapshotID = $instanceImage[0].BlockDeviceMapping[$i].Ebs | foreach {$_.SnapshotId} $snapshotCollection += $snapshotID } }
But the .ebs property is empty for ephemeral devices, leaving an empty entry at the end of the collection, which would generate an error during Remove-EC2Snapshot. So I borrowed the approach from https://www.yobyot.com/aws/deregister-an-aws-ami-and-remove-associated-s3-snapshots/2014/10/30/ and ended up with:
[EDIT] Oops, realized that that didn't properly account for multiple AMIs because I had boiled down my testing to doing one at a time. This is the right code:
foreach ($amiID in $amiCollection) { $instanceImage = Get-EC2Image $amiID $snapshotCollectionTemp = @($instanceImage.blockdevicemapping.ebs.snapshotid) $snapshotCollection = $snapshotCollection + $snapshotCollectionTemp } $snapshotCount = $snapshotCollection.count
Thanks,
Chaz