#ReplicaSet

K8s Basics #4: Deployment and ReplicaSet — Declarative Deploys and Rolling Updates

A follow-up to the closing line of [#3](/en/posts/k8s-basics-3) — Pods are mortal, they just disappear when they die. This post writes a controller manifest for the first time. We pin down the three layers Deployment / ReplicaSet / Pod, watch auto-recovery when one Pod is deleted under replicas: 3, see how a one-character image-tag change drives a rolling update, and roll back a bad version with one command.