PodDisruptionBudgets: The Availability Feature Everyone Skips
PodDisruptionBudgets control how many pods voluntary disruptions can take down. Drain behavior, minAvailable vs maxUnavailable, and PDBs that block upgrades.
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LimitRange and ResourceQuota: Namespace Guardrails That Actually Work
LimitRange sets per-container defaults and bounds; ResourceQuota caps namespace totals. How they interact, the gotchas, and configs that hold up in production.
Read the postQoS Classes: Guaranteed, Burstable, and Who Gets Evicted First
Kubernetes assigns every pod a QoS class: Guaranteed, Burstable, or BestEffort. How the classes are computed and how they decide eviction order under node pressure.
Read the postHPA, VPA, KEDA: Which Autoscaler Does What
HPA scales replicas on metrics, VPA right-sizes requests, KEDA scales on external events. How they differ, how they conflict, and how to combine them safely.
Read the postWhy Your Cluster Autoscaler Isn’t Scaling
Pods Pending, cluster autoscaler doing nothing? The usual causes: PDBs, node group limits, taints, labels, and resource requests no node can satisfy.
Read the postClusterIP, NodePort, LoadBalancer: What You’re Actually Buying
ClusterIP vs NodePort vs LoadBalancer explained by someone who's paid the bills: what each service type actually creates, how kube-proxy routes it, and when to use which.
Read the postPicking an Ingress Controller: nginx vs Traefik vs ALB
An honest ingress-nginx vs Traefik vs AWS ALB comparison from running all three in production: config model, performance, operational pain, and who should pick which.
Read the postForbidden: Debugging RBAC Without Handing Out cluster-admin
RBAC Forbidden errors decode completely if you read them. Use kubectl auth can-i, impersonation, and bindings to grant exactly what's missing.
Read the postYour Pod Is Stuck in Pending: The Actual Checklist
Pod stuck in Pending? Run the real checklist: kubectl describe events, 0/N nodes available reasons, taints and tolerations, resource requests, and unbound PVCs.
Read the postOOMKilled: Debugging Memory Limits Without Guessing
OOMKilled and exit code 137 mean the kernel killed your container. Learn to read Last State, separate cgroup OOM kills from eviction, and find the actual leak.
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