OpenCost — Real-Time Kubernetes Cost Monitoring

What it is

OpenCost is a CNCF sandbox project that monitors and allocates Kubernetes infrastructure costs in real time. It gives teams visibility into cluster spending broken down by namespace, pod, deployment, and custom labels. OpenCost works with all major cloud providers (AWS, GCP, Azure) and on-premise clusters, pulling actual pricing data to calculate accurate per-workload costs.

Platform engineering teams and DevOps engineers managing Kubernetes clusters benefit most from OpenCost. It answers the question 'which team or service is driving our cloud bill' without requiring manual spreadsheet analysis.

How it saves time or tokens

OpenCost automates cost attribution that otherwise requires manual cross-referencing of cloud billing dashboards with Kubernetes resource usage. Instead of spending hours parsing invoices and mapping them to workloads, teams get a real-time dashboard showing exactly where money is going. For AI workloads running on GPU nodes, this visibility helps identify idle resources quickly.

How to use

1. Install OpenCost via Helm into your Kubernetes cluster
2. Configure your cloud provider pricing source (or use on-prem custom pricing)
3. Access the web UI or API to view cost breakdowns by namespace, pod, or label

Example

# Install via Helm
helm repo add opencost https://opencost.github.io/opencost-helm-chart
helm install opencost opencost/opencost \
  --namespace opencost --create-namespace

# Port-forward to access the UI
kubectl port-forward -n opencost \
  svc/opencost 9090:9090

# Open http://localhost:9090 for the cost dashboard
# Or query the API:
curl http://localhost:9090/allocation/compute?window=7d

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Common pitfalls

• Cloud provider pricing APIs require proper IAM permissions; misconfigured access leads to inaccurate cost data
• On-premise clusters need manual pricing configuration since there is no cloud billing API to query
• OpenCost measures resource allocation, not actual utilization; over-provisioned pods show higher costs than they truly consume