kubernetes
4 free lessons tagged kubernetes across Programming. Each one is a short sequence of focused steps with narration and a five-question quiz at the end — take them in any order, no signup required.
The Failure Modes the Design Creates
Reconciliation buys robustness and charges for it in a specific currency: nothing is ever definitely finished, commands succeed without meaning anything worked, and manual fixes are silently undone. This lesson covers the failures that come from the model rather than from bugs, how to debug them, and when the whole thing is the wrong tool.
Scheduling and Resources: Requests Are Not Limits
Two numbers govern where a pod lands and how it behaves under pressure, and they do completely different jobs. Requests are used for placement and are a promise; limits are enforced at run time and are a ceiling. This lesson separates them, covers the asymmetry between CPU and memory enforcement, and explains what actually happens when a node runs out.
Pods, Services, and the Label That Joins Them
The object types look like an arbitrary vocabulary until you notice they are layers of controllers, each reconciling the one below. This lesson works up from the pod, explains why a Service can point at something whose address changes constantly, and shows that the whole system is joined by one mechanism: a label match.
Reconciliation: Declare the End State, Not the Steps
Kubernetes is often taught as a pile of object types. Underneath it is one idea repeated: store a description of the desired state, and run loops that continuously compare it to reality and act on the difference. This lesson builds that loop, explains why it is level-triggered rather than event-driven, and shows what the design buys and costs.