Maintain AWS CloudWatch log streams
AWS Cloudwatch Log minder
AWS CloudWatch logs is an useful logging system, but it has two quircks. It does not allow you too set a default retention period for newly created log groups, and it does not delete empty log streams that are older than the retention period. This utility:
- sets a default retention period on log groups without a period set.
- removes empty log streams older than the retention period of the log group
You can use it as a command line utility. You can also install it as an AWS Lambda function and have your logs kept in order, NoOps style!
install the log minder
to install the log minder, type:
pip install aws-cloudwatch-log-minder
set default retention period
to set the default retention period on log groups without one, type:
cwlog-minder --dry-run set-log-retention --days 30
This will show you which log groups will have its retention period set. Remove the
it the retention period will be set. If you wish to set the retention of all log groups to the same
cwlog-minder --dry-run set-log-retention --days 30 --overwrite
delete empty log streams
To delete empty log streams older than the retention period, type:
cwlog-minder --dry-run delete-empty-log-streams
This will show you which empty log streams will be deleted. Remove the
these stream will be deleted.
deploy the log minder
To deploy the log minder as an AWS Lambda, type:
git clone https://github.com/binxio/aws-cloudwatch-log-minder.git cd aws-cloudwatch-log-minder aws cloudformation deploy \ --capabilities CAPABILITY_IAM \ --stack-name aws-cloudwatch-log-minder \ --template-file ./cloudformation/aws-cloudwatch-log-minder.yaml \ --parameter-overrides LogRetentionInDays=30
This will install the log minder in your AWS account and run every hour.
delete empty log groups
To delete empty log groups, type:
cwlog-minder --dry-run delete-empty-log-groups
This will show you which empty log groups will be deleted. Remove the
these groups will be deleted. Do not use this command, if your log groups are
managed by CloudFormation or Terraform.
export LOG_LEVEL=DEBUG cwlog-minder ...
region and profile selection
AWS regions and credential profiles can be selected via command line arguments or environment variables.
region via parameter
cwlog-minder --region eu-west-1 ...
region via environment
export AWS_DEFAULT_REGION=eu-west-1 cwlog-minder ...
profile via parameter
cwlog-minder --profile dev ...
profile via environment
export AWS_PROFILE=dev cwlog-minder ...
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