Automated backup of EC2 Volume for last seven days using AWS CloudWatch

automated-ec2-backup

'''
This is tiny script (self note) for automated back of AWS EC2

1. Create Lambda function. Visit https://us-west-2.console.aws.amazon.com/lambda/home
2. Assigned right AIM role (should have sufficient privileges). Visit https://console.aws.amazon.com/iam/home?#/roles)
3. Set to schedule run from CloudWatch Event. Visit https://us-west-2.console.aws.amazon.com/cloudwatch/home

'''
import boto3
import datetime

region ='region'
ec2 = boto3.resource('ec2' region)
client = boto3.client('ec2', region)

    
def describe_volumes():
    volumes = client.describe_volumes(
        Filters=[
            {'Name': 'tag:Name', 'Values': ['VolumeName']},
        ]
    )
    if len(volumes['Volumes']) >= 1:
        volume_id = volumes['Volumes'][0]['Attachments'][0]['VolumeId']
        volume = ec2.Volume(volume_id)

        snapshot = volume.create_snapshot(Description='PowrbotMainVolumeImageBackup')

        now = datetime.datetime.utcnow() - datetime.timedelta(days=7)
        for image in volume.snapshots.all():
            tnow = image.start_time.replace(tzinfo=None)
            if image.description == 'AutoSnappVolumeImages' and now > tnow:
                image.delete()
    
def lambda_handler(event, context):
    describe_volumes()
    

This may not require as AWS has Life Cycle Policy