AWSCLi – Create Snapshot and Delete oldest snapshot for 1 Volume

This script was created by my brother Scott Prudence and I, this snapshot’s 1 specific volume then once the snapshot is completed the script then removes the oldest snapshot. This is a way of implementing a weekly snapshot of a single volume within AWS.

NOTE – Change the VOLUMEID variable from vol-xxxxxx to your volume ID

#! /bin/bash

# Set the variables
DATE="$(date +"%d-%m-%y")"
DESCRIPTION="Web server backup - $DATE"
VOLUMEID="vol-xxxxxx"
BACKUPSTOKEEP="1"

# Run the backup
SNAPSHOTID=$(aws ec2 create-snapshot --volume-id $VOLUMEID --description "$DESCRIPTION" --output text --query "SnapshotId")
echo "Waiting for Snapshot ID: $SNAPSHOTID"

SNAPSHOTPROGRESS=$(aws ec2 describe-snapshots --snapshot-ids $SNAPSHOTID --query "Snapshots[*].Progress" --output text)

while [ $SNAPSHOTPROGRESS != "100%" ]
do
 sleep 15
 echo "Snapshot ID: $SNAPSHOTID $SNAPSHOTPROGRESS"
 SNAPSHOTPROGRESS=$(aws ec2 describe-snapshots --snapshot-ids $SNAPSHOTID --query "Snapshots[*].Progress" --output text)
done

# Delete the oldest backup
NUMBEROFBACKUPS="$(aws ec2 describe-snapshots --filters Name=volume-id,Values=$VOLUMEID --query 'Snapshots[].[SnapshotId]' | wc -l)"
if [ $NUMBEROFBACKUPS -gt $BACKUPSTOKEEP ]
then
 SNAPSHOTID=$(aws ec2 describe-snapshots --filters Name=volume-id,Values=$VOLUMEID --query 'Snapshots[].[StartTime,SnapshotId]' --output text | sort -n | head -1 | awk '{print $2}')
 echo "Deleting oldest backup - $SNAPSHOTID"
 aws ec2 delete-snapshot --snapshot-id $SNAPSHOTID
else
 echo "The only backup that exists was just created, not deleting any backups..."
fi