Kubernetes

Kubernetes (K8s) is an open-source container orchestration platform that automates deployment, scaling, and management of containerized applications across clusters of hosts, for developers, DevOps engineers, and organizations running production workloads.

🚀 Overview

Kubernetes is a portable, extensible, open-source platform for managing containerized workloads and services, enabling declarative configuration and automation.

It solves the challenges of deploying, scaling, and operating containerized applications reliably at scale, from local development to global production environments, reducing operational overhead.

It's built for developers building cloud-native apps, operators managing clusters, and platform teams providing self-service infrastructure.

Kubernetes was developed by Google, drawing from 15+ years of experience with Borg (their internal system), and donated to the Cloud Native Computing Foundation (CNCF) in 2015 to democratize container orchestration and incorporate community best practices.

✨ Key Features

Automated rollouts and rollbacks: Gradually deploys updates while monitoring health and auto-reverting on failure.
Service discovery and load balancing: Provides stable IP/DNS for Pods and traffic distribution without app changes.
Storage orchestration: Dynamically mounts persistent storage systems.
Secret and configuration management: Handles sensitive data and configs securely without rebuilding images.
Self-healing: Restarts failed containers, reschedules Pods, and kills unhealthy ones.
Horizontal Pod autoscaling: Scales apps based on CPU/memory or custom metrics.
Batch jobs and CronJobs: Manages stateless one-off tasks and scheduled jobs.
Extensibility: Supports Custom Resource Definitions (CRDs), operators, and plugins. Optional: Upcoming features include enhanced Gateway API, sidecar containers, and improved IPv6 support.

🛠 Tech Stack

Core: Go (Golang)
Key Components: kube-apiserver (API), kube-scheduler, kube-controller-manager, kubelet (node agent), kube-proxy
Database: etcd (distributed KV store)
Container Runtime: containerd, CRI-O, Docker (deprecated)
Dashboard: Kubernetes Dashboard (React, TypeScript)
Auth: RBAC, Service Accounts, OIDC, Webhook token authentication
Hosting: Bare-metal, VMs, public clouds (GKE, EKS, AKS), hybrid setups