On-Premises Pricing

On-premises cluster pricing is supported in OpenCost by providing default prices for node data via the default.json.

{
    "provider": "custom",
    "description": "Default prices based on GCP us-central1",
    "CPU": "0.031611",
    "spotCPU": "0.006655",
    "RAM": "0.004237",
    "spotRAM": "0.000892",
    "GPU": "0.95",
    "storage": "0.00005479452",
    "zoneNetworkEgress": "0.01",
    "regionNetworkEgress": "0.01",
    "internetNetworkEgress": "0.12"
}

This file is loaded when the OpenCost starts up, providing default prices. You may verify these values by querying Prometheus:

kubectl port-forward -n prometheus service/my-prometheus-server 9003:80
curl -s 'http://localhost:9003/api/v1/query?query=node_cpu_hourly_cost' | jq '.data.result[0]'
{
  "metric": {
    "__name__": "node_cpu_hourly_cost",
    "instance": "mom.bottlebru.sh",
    "instance_type": "k3s",
    "job": "opencost",
    "node": "mom.bottlebru.sh",
    "provider_id": "k3s://mom.bottlebru.sh"
  },
  "value": [
    1675411231.44,
    "0.031611"
  ]
}

Similarly you can query node_ram_hourly_cost, node_total_hourly_cost, and pv_hourly_cost.

Modified Default.json Example

You can update the prices in the default.json file and rebuild your container with the modified source (make sure permissions are 644 on the default.json).

{
    "provider": "custom",
    "description": "Modified prices based on arbitrary whims",
    "CPU": "1.25",
    "spotCPU": "0.006655",
    "RAM": "0.50",
    "spotRAM": "0.000892",
    "GPU": "0.95",
    "storage": "0.25",
    "zoneNetworkEgress": "0.01",
    "regionNetworkEgress": "0.01",
    "internetNetworkEgress": "0.12"
}

produces output similar to

kubectl port-forward -n prometheus service/my-prometheus-server 9003:80
curl -s 'http://localhost:9003/api/v1/query?query=node_cpu_hourly_cost' | jq '.data.result[0]'
{
  "metric": {
    "__name__": "node_cpu_hourly_cost",
    "instance": "mom.bottlebru.sh",
    "instance_type": "k3s",
    "job": "opencost",
    "node": "ndnd.bottlebru.sh",
    "provider_id": "k3s://mom.bottlebru.sh"
  },
  "value": [
    1675416174.822,
    "1.25"
  ]
}

This is reflected in the OpenCost UI with substantially higher CPU, RAM and PV costs than before the update.

Custom pricing using the OpenCost Helm Chart

Create a configmap with custom pricing

apiVersion: v1
kind: ConfigMap
metadata:
  name: opencost-conf
data:
  default.json: |
    {
      "provider": "custom",
      "description": "Modified prices based on arbitrary whims",
      "CPU": "1.25",
      "spotCPU": "0.006655",
      "RAM": "0.50",
      "spotRAM": "0.000892",
      "GPU": "0.95",
      "storage": "0.25",
      "zoneNetworkEgress": "0.01",
      "regionNetworkEgress": "0.01",
      "internetNetworkEgress": "0.12"
    }

Attach and reference the configmap by providing helm overrides during install.

opencost:
  exporter:
    extraEnv:
      # The default config path is read only, for customizing we have to swap spots.
      CONFIG_PATH: "/tmp/custom-config"  
    extraVolumeMounts:
      - mountPath: /tmp/custom-config
        name: custom-configs
extraVolumes:
  - name: custom-configs
    configMap:
      name: opencost-conf