DevOps

Introduction Cross-Origin Resource Sharing (CORS) is one of the most misunderstood parts of modern web development. It sits at the intersection of browsers, HTTP, and security, and when it goes wrong you often see opaque errors like “CORS policy: No ‘Access-Control-Allow-Origin’ header…”. This guide takes you from zero to hero: you’ll learn the mental model behind CORS, how the browser enforces it, how to configure servers correctly across popular stacks, how to optimize performance, and how to avoid common security pitfalls. ...

Nginx is one of the most popular open-source web servers in the world, widely used not only to serve static content but also as a reverse proxy, load balancer, and HTTP cache. This comprehensive tutorial will guide you step-by-step from the basics of installing Nginx to configuring advanced features, helping you become proficient in managing and optimizing it for your projects. Table of Contents Introduction to Nginx Installing Nginx Understanding Nginx Architecture Basic Configuration and Serving Static Content Configuring Reverse Proxy and Load Balancing Optimizing Nginx Performance Setting Up HTTPS with SSL/TLS Advanced Configurations and Use Cases Useful Commands for Managing Nginx Further Resources Conclusion Introduction to Nginx Nginx (pronounced “Engine-X”) is a high-performance web server designed to handle many concurrent connections efficiently. Unlike traditional web servers, it uses an event-driven, asynchronous architecture, which makes it well suited for high-traffic websites and applications. ...

Introduction HAProxy is the de facto open-source load balancer and reverse proxy for high-traffic websites, APIs, and microservices. It’s fast, battle-tested, extremely configurable, and equally at home terminating TLS, routing based on headers or paths, defending against abuse, or load balancing TCP streams. This zero-to-hero guide takes you from first principles to production-ready configurations. We’ll cover installation, core concepts, practical configuration patterns, TLS, health checks, observability, advanced features like ACLs and stick tables, and safe reloads—with copy-and-pasteable examples. ...

Introduction Microservices promise speed, scalability, and team autonomy by decomposing a system into small, independently deployable services. But they also introduce complexity in distributed systems, data consistency, and operational overhead. This in-depth, zero-to-hero guide walks you through microservices architecture from fundamentals to production-ready practices. You’ll learn when to choose microservices, how to design services and APIs, what tooling to adopt, and how to deploy, secure, and observe them at scale. Code snippets and reference patterns are included to bridge theory and practice. We end with curated resources for further study. ...

Introduction Kubernetes has become the de facto standard for running containerized applications at scale. But the ecosystem can feel overwhelming: pods, deployments, services, ingress, operators, Helm, RBAC—the list goes on. This in-depth tutorial takes you from zero to hero with clear explanations, hands-on examples, and practical guidance. You’ll learn the mental model, set up a local cluster, deploy and expose applications, manage configuration and storage, scale reliably, secure your workloads, observe and debug issues, and ship to production using modern workflows. ...