What a container actually is on an Ubuntu VM — three problems that VMs and containers each solve, the runtime stack from dockerd and kubelet down to runC, why runC vanishes and containerd-shim stays as the parent, the six namespaces and one cgroup directory seen through /proc.
How Kubernetes Deployment resource automates application upgrades and rollbacks through declarative strategies including RollingUpdate, Recreate, Blue-Green, and Canary.
How to declare resource requirements and runtime dependencies so Kubernetes can schedule and manage containers predictably.
A beginner-friendly summary of Chapter 1 from Kubernetes Patterns — covering containers, pods, services, labels, annotations, and namespaces.
앱 옆에 붙어 공통 잡일을 대신하는 컨테이너. 앱 코드를 고치지 않고 기능을 얹는 방법이다.