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ec2_mybackup.sh
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ec2_mybackup.sh
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#!/bin/bash
export PATH=$PATH:/home/mickael/.local/bin/:/usr/bin
## Automatic AWS EBS Volume Snapshot Creation & Clean-Up Script
#
# Written by Mickael Alliel (https://www.mickaelalliel.com)
# Script Github repo: https://github.com/MickaelAlliel
#
# PURPOSE: This Bash script can be used to take automatic snapshots of your Linux EC2 instance. Script process:
# - Determine volume id and region from arguments
# - Take a snapshot of the volume id
# - The script will then delete all associated snapshots taken by the script for this volume id that are older than 3 days
#
# DISCLAIMER: This script deletes snapshots (though only the ones that it creates).
# Make sure that you understand how the script works. No responsibility accepted in event of accidental data loss.
#
## Variable Declarations ##
RETENTION_DAYS=3
CURRENT_DATE=$(date +%s)
PURGE_DATE=$(date +%s --date "$RETENTION_DAYS days")
REGION='eu-central-1'
while getopts "v:tr" option
do
case $option in
v)
VOLUME_ID=$OPTARG
;;
t)
RETENTION_DAYS=$OPTARG
PURGE_DATE=$(date +%s --date "$RETENTION_DAYS days")
;;
r)
REGION=$OPTARG
;;
esac
done
add_tags() {
echo 'Creating tags for new snapshot...'
snapshot_tags="Key=CreatedBy,Value=ec2ma_autobackup"
snapshot_tags="$snapshot_tags Key=CreatedAt,Value=$CURRENT_DATE"
snapshot_tags="$snapshot_tags Key=PurgeAfter,Value=$PURGE_DATE"
created_tags=$(aws ec2 create-tags --resources $created_snapshot_id --region $REGION --tags $snapshot_tags)
echo 'Tags created!'
echo''
}
create_snapshot() {
echo Creating new snapshot for volume $VOLUME_ID
created_snapshot_id=$(aws ec2 create-snapshot --volume-id $VOLUME_ID --region $REGION --description 'MA EC2 Automatic Backup Script' --output text --query SnapshotId)
echo $created_snapshot_id - created succesfully!
echo ''
}
get_snapshots_list() {
echo Getting list of existing snapshots for volume $VOLUME_ID
SNAPSHOTS_LIST=$(aws ec2 describe-snapshots --filters Name=volume-id,Values=$VOLUME_ID Name=tag:CreatedBy,Values=ec2ma_autobackup --output text --query 'Snapshots[*].SnapshotId')
}
purge_snapshots() {
echo 'Preparing to delete old snapshots...'
echo ''
for snap_id in $SNAPSHOTS_LIST; do
if [ -z $snap_id ]; then
echo 'No snapshots to purge'
else
purge_after=$(aws ec2 describe-snapshots --snapshot-id $snap_id --output text | grep ^TAGS.*PurgeAfter | cut -f 3)
if [ $CURRENT_DATE -ge $purge_after ]; then
echo Deleting $snap_id
$(aws ec2 delete-snapshot --snapshot-id $snap_id)
else
echo Snapshot $snap_id is not up for purge yet. Moving on!
fi
fi
done
echo ''
echo 'Old snapshots successfully purged!'
}
echo 'Beginning MA EC2 Automatic Backup Script --'
echo $(date +%Y-%m-%H___%R:%S)
create_snapshot
add_tags
get_snapshots_list
purge_snapshots
echo 'Terminated MA EC2 Automatic Backup Script --'
echo ''
echo ''
echo ''