castai-prod-checklist

CAST AI Production Checklist

Overview

Complete checklist for enabling CAST AI cost optimization on a production Kubernetes cluster. Covers Phase 1 (monitoring) through Phase 2 (full automation) with validation steps at each stage.

Prerequisites

• CAST AI tested on a staging cluster first
• Production API key (Full Access)
• Change management approval for node lifecycle changes

Phase 1: Monitoring Only

• Agent installed with read-only key
• Agent pod healthy: kubectl get pods -n castai-agent
• Console shows cluster as "Connected"
• Savings report generating (wait 24h for full data)
• Review savings estimate before enabling automation

Phase 2: Autoscaling Enabled

• Full Access API key provisioned and stored in secrets manager
• Cluster controller installed
• Evictor installed with conservative settings (non-aggressive)
• Spot handler installed for graceful interruption handling
• Autoscaler policies configured with appropriate limits:
  • clusterLimits.cpu.maxCores set to safe ceiling
  • unschedulablePods.headroom configured (10-15%)
  • nodeDownscaler.emptyNodes.delaySeconds >= 300 for production
  • spotInstances.spotDiversityEnabled = true
• Node templates created for workload-specific needs (GPU, high-memory)
• PodDisruptionBudgets set on all critical workloads

Workload Autoscaler

• Workload autoscaler installed
• Critical deployments annotated with min/max resource bounds
• Anti-shrink cooldown set (300s minimum)
• Memory headroom >= 20% for production workloads

Security

• API key in secrets manager (not Helm values files)
• Kvisor security agent installed
• Network policies applied to castai-agent namespace
• RBAC reviewed and minimized
• Key rotation scheduled (90-day interval)

Monitoring and Alerting

• Alert on agent pod restarts: kube_pod_container_status_restarts_total{namespace="castai-agent"}
• Alert on API errors in agent logs
• CAST AI console email notifications enabled
• Savings report reviewed weekly
• Dashboard tracking spot vs on-demand node ratio

Rollback Procedure

# Disable autoscaling immediately (keeps agent monitoring)
curl -X PUT -H "X-API-Key: ${CASTAI_API_KEY}" \
  -H "Content-Type: application/json" \
  "https://api.cast.ai/v1/kubernetes/clusters/${CASTAI_CLUSTER_ID}/policies" \
  -d '{"enabled": false}'

# Or remove all CAST AI components
helm uninstall castai-evictor -n castai-agent
helm uninstall cluster-controller -n castai-agent
# Keep the agent for monitoring if desired

Validation Commands

# Final pre-go-live verification
echo "=== CAST AI Production Validation ==="

# Agent healthy
kubectl get pods -n castai-agent -o wide

# All components running
helm list -n castai-agent

# Policies correct
curl -s -H "X-API-Key: ${CASTAI_API_KEY}" \
  "https://api.cast.ai/v1/kubernetes/clusters/${CASTAI_CLUSTER_ID}/policies" \
  | jq '{enabled, unschedulablePods: .unschedulablePods.enabled, downscaler: .nodeDownscaler.enabled, spot: .spotInstances.enabled}'

# Savings estimate
curl -s -H "X-API-Key: ${CASTAI_API_KEY}" \
  "https://api.cast.ai/v1/kubernetes/clusters/${CASTAI_CLUSTER_ID}/savings" \
  | jq '{monthly: .monthlySavings, percent: .savingsPercentage}'

Resources

• CAST AI Autoscaler Checklist
• CAST AI Status

Next Steps

For version upgrades, see castai-upgrade-migration.