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AWS LightSail Delete Snapshots

August 8, 2019

Here’s my script to delete AWS LightSail snapshots. It can delete daily or weekly backups and scheduled via crontab. If you want longer or shorter retention, adjust the expired value. It’s in seconds. 604800 is 1 week. 2592000 is 1 month.

#!/bin/bash
 
current=$(date +%s)
 
if [ $# -eq 0 ]; then
  exit 1
fi
 
if [[ $1 = 'daily' ]]; then
  prefix='daily'
  expired=$(($current-604800))
elif [[ $1 = 'weekly' ]]; then
  prefix='weekly'
  expired=$(($current-2592000))
else
  exit 1
fi
 
snaps='/root/snapshots/snapshots.json'
names='/root/snapshots/names.txt'
parse='/root/snapshots/parse.txt'
logfile='/root/snapshots/snapshots.log'
 
/usr/local/bin/aws lightsail get-instance-snapshots > $snaps
cat $snaps | jq -r '.instanceSnapshots[] | .name' > $names
cat $names | grep $prefix > $parse
 
while read -r line; do
 
  snapshot=$(echo $line | cut -d_ -f3)
  snapshotname=$line
 
  if [ `expr $snapshot + 1 2> /dev/null` ] ; then
 
    if [ $snapshot -le $expired ]; then
      echo 'Deleted: '$snapshotname >> $logfile
      /usr/local/bin/aws lightsail delete-instance-snapshot \
      --instance-snapshot-name $snapshotname
    else
      echo 'Nothing: '$snapshotname >> $logfile
    fi
 
  else
    echo $snapshot is not numeric > /dev/null
  fi
 
done < $parse
 
echo 'Current time: '$current >> $logfile
echo 'Expired time: '$expired >> $logfile
echo '-----------------------------------' >> $logfile

#!/bin/bash current=$(date +%s) if [ $# -eq 0 ]; then exit 1 fi if [[ $1 = 'daily' ]]; then prefix='daily' expired=$(($current-604800)) elif [[ $1 = 'weekly' ]]; then prefix='weekly' expired=$(($current-2592000)) else exit 1 fi snaps='/root/snapshots/snapshots.json' names='/root/snapshots/names.txt' parse='/root/snapshots/parse.txt' logfile='/root/snapshots/snapshots.log' /usr/local/bin/aws lightsail get-instance-snapshots > $snaps cat $snaps | jq -r '.instanceSnapshots[] | .name' > $names cat $names | grep $prefix > $parse while read -r line; do snapshot=$(echo $line | cut -d_ -f3) snapshotname=$line if [ `expr $snapshot + 1 2> /dev/null` ] ; then if [ $snapshot -le $expired ]; then echo 'Deleted: '$snapshotname >> $logfile /usr/local/bin/aws lightsail delete-instance-snapshot \ --instance-snapshot-name $snapshotname else echo 'Nothing: '$snapshotname >> $logfile fi else echo $snapshot is not numeric > /dev/null fi done < $parse echo 'Current time: '$current >> $logfile echo 'Expired time: '$expired >> $logfile echo '-----------------------------------' >> $logfile

Schedule deletes via crontab.

# run daily at 5am
0 5 * * * /bin/bash /root/snapshots/delete-snapshot.sh daily 2>&1
# run weekly every sunday at 6am
0 6 * * 0 /bin/bash /root/snapshots/delete-snapshot.sh weekly 2>&1

# run daily at 5am 0 5 * * * /bin/bash /root/snapshots/delete-snapshot.sh daily 2>&1 # run weekly every sunday at 6am 0 6 * * 0 /bin/bash /root/snapshots/delete-snapshot.sh weekly 2>&1

Filed Under: Cloud, Linux Tagged With: aws, bash, cli, cron, delete, lightsail, snapshots

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