rightsizer

rightsizer allows you to compute the appropriate size of your ECS services based on the average resource usage in a given period of time. You can use the output of the program to update your task definitions and keep your services on the perfect size.

Usage

In order to use rightsizer you need to be logged in to your AWS Cli using aws config files or a credential manager like our own hologram. Then you invoque the rightsizer command using your target cluster and service:

$ rightsizer some-cluster some-service
containerDefinitions:
  some-database:
    cpu: 1
    memory: 500
    memoryReservation: 95
  some-nginx-thing:
    cpu: 1
    memory: 500
    memoryReservation: 95
  some-language-api:
    cpu: 1
    memory: 500
    memoryReservation: 95

The program will output the suggested configuration for your service based on your actual usage. Then you can use this output to patch your service or patch your deploy configuration.

Getting rightsizer

The best way to get rightsizer is from dockerhub:

docker pull nextroll/rightsizer

Then you can run the container with the following command:

docker run --rm nextroll/rightsizer rightsizer some-cluster some-service

Building rightsizer

If you want to build rightsizer from source you can use the following,

go build .

This will generate a binary called rightsizer that you can use to run the program.

Testing rightsizer

We use gomock to generate mocks for our custom clients. If you update or create a new client, you need to regenerate the mocks. You can do this by running:

go generate ./...

Then you can run the tests with the following command:

go test ./...