Kubernetes Fundamentals

📌 Pinned

Kubernetes Fundamentals - Series Overview

The Kubernetes Fundamentals domain in my KCNA study notes covers the architecture and core resources at a conceptual level - this series goes one layer deeper, into the actual objects and kubectl commands behind those concepts. This series is the companion to Docker Fundamentals, one level up the stack - it assumes that Docker layer (containers, images, the container runtime) and builds the Kubernetes object model on top of it. A throwaway cluster (minikube, kind, or a Killercoda sandbox) is the only prerequisite; none of this needs a managed cloud Kubernetes service to follow along. The series Chapter 1 - Kubernetes Architecture The control plane and node components - kube-apiserver, etcd, kubelet, the controller manager, and the scheduler - and what each is actually responsible for. ...

Posts

Kubernetes Fundamentals - kubectl and Pods

This is Chapter 2 of the Kubernetes Fundamentals series. Installing kubectl Install kubectl before a local cluster tool like minikube - minikube depends on it being present. kubectl reference kubectl Quick Reference Install kubectl - official install steps per OS Confirm kubectl can reach the cluster: kubectl cluster-info List the nodes in it: kubectl get nodes Check a node’s details - capacity, conditions, and what’s running on it: kubectl describe nodes Output formatting kubectl [command] [TYPE] [NAME] -o <format> controls how a command’s output is rendered: ...

Kubernetes Fundamentals - Architecture

This is Chapter 1 of the Kubernetes Fundamentals series. Nodes and clusters A node (sometimes called a minion) is a worker machine in Kubernetes - a collection of Pods runs on it. Multiple nodes together form a cluster. One node in that cluster is the master node - it watches over the worker nodes, orchestrates containers across them, and is where Kubernetes itself is installed. The five components Installing Kubernetes means installing five components. A mnemonic worth keeping: Api-server, Etcd, Kubelet, Controller, Scheduler: ...