Tag
5 items tagged Kubectl.
A troubleshooting sequence (get, describe, logs, events, exec, port-forward) applied to four broken workloads: a crashing container, a missing image, a missing ConfigMap and an empty Service. Real events, real fixes.
What readiness, liveness and startup probes do (with a failing one of each), how requests decide scheduling and limits decide OOMKilled and throttling, what the cgroup counters show, and how termination grace works.
Manual scaling, rolling updates and rollback as an operator sees them, and a HorizontalPodAutoscaler on kind with metrics-server: real utilisation figures, a 2-to-6 scale-up under load, and the scale-down window.
How a request finds a pod: cluster DNS, the Service ClusterIP, the EndpointSlice the selector fills, port versus targetPort, headless Services and Ingress in outline; each inspected on a kind cluster, mistakes included.
Deployments, StatefulSets, DaemonSets, Jobs and CronJobs on a real three-node cluster: what kubectl reports, what happens when you delete a pod of each kind, why a DaemonSet skips the control plane, and which to use.