DEPRECATED DO NOT USE OR UPDATE
This is a small Serverless Framework application that will restart a given AWS Fargate Service once it goes over an 85% memory usage.
As Rails applications tend to have memory leaks, and AWS Fargate has a hard memory limit when it comes to the tasks you can run on it, this will make sure services are gracefully restarted before they reach that limit.
The project will create two alarms in Cloudwatch: one for the admin service and one for the api service. The alarm will then trigger
when the memory usage of any of the services reaches 85% or more over a period of 4 minutes.
The alarms are then piped to an SNS topic. And finally, we have a small lambda function subscribed to that SNS topic.
When the lambda executes, it inspects the payload, find out which service triggered it, and proceeds to safely restart that service in AWS Fargate.
First of all, clone the repository. Then do a bundle install. If you don't have the Serverless framework installed, make sure you do by
installing the npm package: npm install serverless -g. Finally, ensure your terminal has the AWS credentials properly configured. After
setting all this up, just run serverless deploy to deploy.
By default the deploy will trigger the staging stage. You can override this by passing in a stage parameter to the command: serverless deploy --stage production.
The code is tested using rspec. To run the tests, simply run bundle exec rspec.