33 posts tagged with "Kubernetes"

Learning Kubernetes without a roadmap is like navigating a city without a map — you will eventually get somewhere, but you will waste a lot of time going in circles. This is the plan I wish I had when I started. Six months of structured learning, from "what is a container" to passing the CKA exam and being confident enough to run production clusters.

Whether you are preparing for a DevOps engineer role, a platform engineering position, or the CKA/CKAD certification, these 50 questions cover what interviewers actually ask. Each answer is concise enough to say in an interview but detailed enough to demonstrate real understanding.

Most Kubernetes performance problems are not in your application code. They are in the platform underneath — an etcd database that has not been defragmented in months, an API server drowning in audit logs, a scheduler that takes 5 seconds to place a pod, or CoreDNS adding 30ms to every service call. Fixing these is free performance you are leaving on the table.

Docker Compose is excellent for running multi-container applications on a single machine. But when your application needs to run across multiple nodes, survive hardware failures, scale to thousands of replicas, or serve traffic globally, Compose cannot follow. Kubernetes was built for exactly these problems. This post maps every Compose concept to its Kubernetes equivalent, walks through both automated and manual migration, and shows the hybrid workflow most teams actually use in practice.

Your Kubernetes cluster will fail. Maybe not today, maybe not this quarter, but the combination of cloud provider outages, human error, and software bugs guarantees that at some point your cluster will be unavailable. The question is not if — it is whether you can recover in minutes instead of hours, and whether you lose zero data instead of the last six hours.

You have built your app, containerized it, wrote the Kubernetes manifests, and it works great in staging. Now someone says "let's go to production" and suddenly you are wondering what you forgot. This checklist exists because every production incident I have seen traces back to skipping something obvious during setup.