aws_cloudwatch_log_group_retention.py

#!/usr/bin/env python3
'''
This script sets a retention on all the logGroups that don't have one set
'''
import boto3
import logging

# Retention it will be set to
RETENTION = 30

logging.basicConfig(format='%(message)s', level=logging.INFO)
client = boto3.client('logs')
paginator = client.get_paginator('describe_log_groups')
for page in paginator.paginate(limit = 50):
    for group in page.get('logGroups', []):
        _ret = group.get('retentionInDays', -1)
        name = group.get('logGroupName', '')
        if _ret == -1 and len(name) > 0:
            logging.info('Setting retention to %s days for %s', RETENTION, name)
            client.put_retention_policy(logGroupName=name, retentionInDays=RETENTION)