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lambda MonkeyKiller

Kills an AWS instance based on a tag periodically. Monkey is a friendly reference to Netflix Simian Army.

Environment variables

  • MAX_AGE_DAYS : if the instance is older than this, it will be terminated, no matter what.
  • TAG_TO_KILL : Value of the Name taht will be used to filter the Instances to consider for termination.
  • ODDS : The designated instances will not be destroyed everytime. If ODDS is set to 5, it will have 20% chances to be terminated. It ODDS is set to 1, the machine will have 100% chances to be terminated.

Deployment

grunt transformes the ES6 syntaxes into ES5 with babel prior to deployment, as Lambda only supports Node 6 at this time.

Scheduling

Scheduling can be achieved using AWS Cloudwatch events.

Testing locally

DEBUG=* MAX_AGE_DAYS=5 TAG_TO_KILL=my-target ODDS=5 grunt lambda_invoke

Credentials

Local credentials (used for deployment) and Lambda credentials (used for execution) must be provided either via environment variables or IAM profiles.

Caveats

  • Instead of Name, a specific tag should be used
  • This terminates only 1 machine. It should be able to handle the case of multiple machines returned by the listInstances() call.