terraform-aws-ec2-pricing

Terraform module that uses the AWS Pricing API to query EC2 instance type attributes

Usage

module "instance" {
  source        = "bendrucker/ec2-pricing/aws"
  instance_type = "m5.large"
}

The module exposes outputs that describe key attributes of the specified instance type. These values are helpful for creating monitoring or resource quotas that are defined relative to the instance's capacity.

For example, you might pass these along to a kubernetes_resource_quota in order to assign a percentage of cluster capacity to a namespace:

locals {
  # allow developers to use 80% of worker resources
  # reserve the remaining 20% for system components
  developer_quota = 0.8
}

resource "kubernetes_resource_quota" "developers" {
  metadata {
    name      = "developers-quota"
    namespace = "developers"
  }

  spec {
    hard = {
      cpu    = var.worker_count * module.instance.cpus * local.developer_quota
      memory = "${var.worker_count * module.instance.memory * local.developer_quota} GiB"
    }
  }
}

Providers

Name	Version
aws	~> 2

Inputs

Name	Description	Type	Default	Required
instance_type	EC2 instance type for which attributes will be fetched	`string`	n/a	yes

Outputs

Name	Description
cpus	Number of CPU cores available on the instance
memory	Memory available on the instance, in gibibytes (GiB)

Testing

This module is tested via Terratest.

make test