kcost

README

kcost

kcost is a cli tool (& quick hack) to calculate the monthly cost of a Google Kubernetes Engine (GKE) Autopilot cluster. It iterates over all pods in the cluster, checks their resource consumption against a price table, and calculates the total cost.

How it works

kcost uses kubectl to interact with the Kubernetes cluster. It retrieves information about the nodes and pods in the cluster, except those in excluded namespaces, and calculates the cost based on the CPU and memory requested by each pod.

Prerequisites

• Go 1.21 or higher
• kubectl installed and configured to interact with your GKE cluster

Installation

go install github.com/gigurra/kcost@latest

Configuration

kcost uses a configuration file named config.yaml. This file should be located in the same directory from where you run the kcost command. The configuration file contains the price details for GKE Autopilot and the namespaces to exclude from the cost calculation.

Here is an example of a config.yaml file:

prices:
  gke:
    autopilot:
      spot:
        cpu: 11
        ram: 1
      regular:
        cpu: 36
        ram: 4
namespaces:
  excluded:
    - 'gke-gmp-system'
    - 'gke-managed-filestorecsi'
    - 'gmp-public'
    - 'kube-node-lease'
    - 'kube-public'
    - 'kube-system'

• Prices are in currency units per GB (ram) and CPU cores (cpu).
• The example prices match the best Autopilot prices in Euros currently (2023-09-25).

Example

> kcost

2023/09/25 23:14:53 INFO 
2023/09/25 23:14:53 INFO -----------PRICE FOR NAMESPACE default------------
2023/09/25 23:14:53 INFO  + pod ubuntu-deployment-b8c49ddcf-2qb5b: spot=true, cpu=0.500000, memory=0.500000 => price=6.000000
2023/09/25 23:14:53 INFO  = 6.000000
2023/09/25 23:14:53 INFO 
2023/09/25 23:14:53 INFO -->> TOTAL PRICE: 6.000000

• The cpu and memory units are in GB and cores respectively.

License

kcost is released under the MIT License.

Future

• Maybe add some cli args
• Maybe include a default config
• Maybe go eat some ice cream!