The Kubernetes Cost Problem
Kubernetes makes it easy to deploy workloads — sometimes too easy. Without proper governance, clusters accumulate over-provisioned resources, idle workloads, and forgotten environments that silently inflate cloud bills.
Studies show that the average Kubernetes cluster wastes 30-50% of its allocated resources.
Strategy 1: Right-Size Resource Requests and Limits
Most teams set CPU and memory requests based on guesswork. Use historical utilization data to right-size:
- Analyze actual usage over 7-14 days
- Set requests to the P95 of actual usage
- Set limits to 2x requests for burst capacity
- Use Vertical Pod Autoscaler (VPA) recommendations
Strategy 2: Implement Horizontal Pod Autoscaling (HPA)
Scale pods based on actual demand instead of running at peak capacity:
- Use CPU and memory metrics for basic scaling
- Implement custom metrics for business-driven scaling
- Set appropriate min/max replicas
Strategy 3: Use Spot/Preemptible Instances
Run non-critical workloads on spot instances for 60-90% savings:
- Dev/staging environments
- Batch processing jobs
- Stateless worker pools
- CI/CD build agents
Strategy 4: Namespace Resource Quotas
Prevent teams from over-allocating resources:
- Set CPU and memory quotas per namespace
- Implement LimitRanges for default pod resources
- Review and adjust quotas quarterly
Strategy 5: Clean Up Idle Resources
Regularly audit and remove:
- Unused PersistentVolumeClaims
- Orphaned ConfigMaps and Secrets
- Completed Jobs and Pods
- Unused Services and Ingresses
Strategy 6: Multi-Tenancy and Cluster Consolidation
Instead of one cluster per team, consolidate with proper namespace isolation:
- Use NetworkPolicies for traffic isolation
- Implement RBAC for access control
- Set ResourceQuotas per team
Strategy 7: Reserved Instances for Base Load
Use reserved instances for predictable base load and spot for burst:
- Analyze your baseline resource consumption
- Purchase 1-year or 3-year reservations for base
- Use node autoscaling for variable demand
Strategy 8: Continuous Cost Monitoring
Implement real-time cost visibility:
- Tag resources by team, environment, and project
- Set budget alerts for unexpected spikes
- Review cost reports weekly
How SRExpert Helps Optimize Costs
SRExpert provides resource analytics across all clusters, highlighting over-provisioned workloads, idle resources, and cost optimization opportunities with actionable recommendations.