How to clean orphaned EBS SnapShots in Amazon Web Services
Managing AWS resources is the key and i believe is the single most important thing you need to do as AWS consumer. Amazon will give access to unlimited resources so do get carried away.
From time to time you will have EBS SnapShots stacking up so for this i use this easy script to identify and remove EBS SnapShots that are not attached to any AMI.
#!/bin/bash
set -e
AWS_ACCOUNT_ID=self
REGION=ap-southeast-2
ORPHANED_SNAPSHOTS_COUNT_LIMIT=10
WORK_DIR=/tmp
aws ec2 --region $REGION describe-snapshots --owner-ids $AWS_ACCOUNT_ID --query Snapshots[*].SnapshotId --output text | tr '\t' '\n' | sort $WORK_DIR/all_snapshots
aws ec2 --region $REGION describe-images --filters Name=state,Values=available --owners $AWS_ACCOUNT_ID --query "Images[*].BlockDeviceMappings[*].Ebs.SnapshotId" --output text | tr '\t' '\n' | sort $WORK_DIR/snapshots_attached_to_ami
ORPHANED_SNAPSHOT_IDS=comm -23 <(sort $WORK_DIR/all_snapshots) <(sort $WORK_DIR/snapshots_attached_to_ami)
if [ -z "$ORPHANED_SNAPSHOT_IDS" ]; then
echo "OK - no orphaned (not attached to any AMI) snapshots found"
exit 0
fi
ORPHANED_SNAPSHOT_IDS=echo "$ORPHANED_SNAPSHOT_IDS" | grep "snap"
ORPHANED_SNAPSHOTS_COUNT=echo "$ORPHANED_SNAPSHOT_IDS" | wc -l
if (( ORPHANED_SNAPSHOTS_COUNT ORPHANED_SNAPSHOTS_COUNT_LIMIT )); then
echo "CRITICAL - $ORPHANED_SNAPSHOTS_COUNT orphaned (not attached to any AMI) snapshots found: [ $ORPHANED_SNAPSHOT_IDS ]"
echo "To delete them, use commands below:"
IFS=$'\n'
for snapshot_id in $ORPHANED_SNAPSHOT_IDS; do echo "aws ec2 --region $REGION delete-snapshot --snapshot-id $snapshot_id"; done
exit 1
else
echo "OK - $ORPHANED_SNAPSHOTS_COUNT orphaned (not attached to any AMI) snapshots found"
if (( ORPHANED_SNAPSHOTS_COUNT 0 )); then
echo "[ $ORPHANED_SNAPSHOT_IDS ]"
fi
exit 0
fi
