33 posts tagged with "Kubernetes"

You have a ClusterIP Service. You have a NodePort Service. You even have a LoadBalancer Service. But the moment you need path-based routing, virtual hosts, or TLS termination for multiple apps behind a single IP, Services alone fall apart. That is where Ingress takes over.

You can write perfect YAML manifests, but if you cannot navigate a cluster quickly with kubectl, you will drown during an incident. This post is your combat reference — 40 commands organized by category, each with real examples you can run right now. Bookmark this one.

You deploy a PostgreSQL pod. It works great until the pod restarts and all your data vanishes. Containers are ephemeral by design — their filesystem dies with them. Kubernetes storage solves this by letting you attach durable disks that survive pod restarts, rescheduling, and even node failures. But the storage system has layers, and understanding them saves you from painful data loss.

Your app needs a database URL in dev, a different one in staging, and yet another in production. You could bake each URL into a separate Docker image, but then you would need three images for the same code. ConfigMaps and Secrets let you inject configuration at deploy time, so one image works everywhere. Here is how to use them properly.

Your cluster has three teams deploying apps. The frontend team accidentally deletes the backend team's ConfigMap because everything is in the default namespace. The ML team's GPU-hungry job starves everyone else of resources. Sound familiar? Namespaces fix this by giving each team their own isolated sandbox with enforced resource limits.

Your deployment has 5 pods running happily. But pods die and get replaced constantly — each time with a new IP address. So how does your frontend talk to your backend if the backend's IP keeps changing? The answer is Services, and getting them right is the difference between a working cluster and a networking nightmare.