Learn DevOps, Kubernetes & AWS — Simplified
Practical tutorials, deep dives, and battle-tested guides for engineers who build and ship in the cloud.
By KP | TZoneLabs | DevOps & Cloud Engineering For nine days, our cluster added and removed the same three worker nodes every six minutes. Every dashboard we watched stayed green the whole time. Pods were running, nodes were Ready, CPU never crossed 60%. Nobody noticed until the AWS bill landed about 40% higher than … Read more
By KP | TZoneLabs | DevOps & Cloud Engineering An AccessDenied error from AWS tells you almost nothing. It names the action and sometimes the resource, but never which of the five places a permission could be blocked actually blocked it. We used to open the IAM console and read policies line by line, sometimes … Read more
By KP | TZoneLabs | DevOps & Cloud Engineering At 3 AM, our ingress started rejecting every HTTPS request with a certificate error. Every health check we had was green. Every pod was Running. The cluster looked perfectly healthy because none of our monitoring ever asked the one question that mattered: how many days is … Read more
By KP | TZoneLabs | DevOps & Cloud Engineering The fastest way to grant a pod too much power in Kubernetes is kubectl create clusterrolebinding temp –clusterrole=cluster-admin –serviceaccount=default:default. It works immediately, which is exactly the problem. Nobody circles back to fix it, and six months later a compromised pod can read every secret in the … Read more
By KP | TZoneLabs | DevOps & Cloud Engineering A PodDisruptionBudget doesn’t protect your application — it protects a number. That’s why a routine EKS managed node group upgrade recently stalled on us for 40 minutes and paged on-call at 2am, even though our minAvailable: 2 config was textbook. The PDB was doing exactly what … Read more
By KP | TZoneLabs | DevOps & Cloud Engineering Most engineers size EKS nodes by CPU and memory. We did too — until one day a pod sat in Pending, the node had plenty of compute free, and the events said something about failing to assign an IP. That was our introduction to the quietest … Read more
kubectl debug node replaces SSH, bastions, and open ports for Kubernetes node access. Learn the exact commands, security benefits, debugging profiles, and real-world walkthrough.
Kubernetes pod eviction silently killed 60% of our production pods. Learn how QoS classes work, how to find at-risk pods, and how to fix and enforce resource requests permanently.
By KP | TZoneLabs | DevOps & Cloud Engineering Here is something nobody tells you when you start in DevOps: the error message is almost never the problem. It is just the messenger. A pod crashes — you blame the application. An API times out — you blame the network. A deployment fails — you … Read more
By KP | TZoneLabs | DevOps & Cloud Engineering We were in the middle of a production scaling event when everything went quiet — in the worst way possible. No crash. No alert. No obvious Kubernetes error. Just pods stuck in Pending, GitHub Actions deployment jobs timing out, and the entire team staring at dashboards … Read more