DevOps

Introduction Have you ever wondered how Kubernetes decides where to run your pods? That’s where the kube-scheduler comes into play. It’s one of the most important — yet often overlooked — components in the Kubernetes control plane. Let’s explore how it works in plain English. What is kube-scheduler? kube-scheduler is the default scheduler for Kubernetes. Its job is simple but critical: 🧠 It picks a node for every pod that doesn’t yet have a node assigned. ...

Amazon Web Services vs Cloudflare: What’s the Difference? Amazon Web Services (AWS) and Cloudflare are both major cloud providers, but they serve different purposes. AWS offers a full suite of cloud computing services, while Cloudflare focuses on performance and security at the network edge. Quick Overview Feature AWS Cloudflare Core Purpose Full cloud computing (IaaS, PaaS, SaaS) Edge CDN, DNS, and security Popular Services EC2, S3, Lambda, Route 53 CDN, DNS, WAF, DDoS Protection Global CDN Amazon CloudFront Built-in and faster at the edge DNS Route 53 Fast DNS with built-in proxy/security DDoS Protection AWS Shield Included with Cloudflare proxy SSL/TLS ACM or manual setup Free and automatic Pricing Model Pay-as-you-go, complex Free tier + flat pricing When to Choose AWS Full infrastructure deployment (compute, storage, DB) Custom cloud-native app architecture Need for serverless (Lambda), container services (ECS, EKS) When to Choose Cloudflare CDN + DNS + WAF + DDoS on top of existing hosting Protect origin servers from attacks Easy HTTPS setup and caching without managing infrastructure Combined Approach (Best Practice) Often, they’re used together: ...

Why Dockerfile Best Practices Matter Poorly written Dockerfiles lead to large, insecure, and hard-to-maintain container images. Following best practices ensures faster builds, smaller images, better security, and improved maintainability. 1. Use Official or Minimal Base Images Choose minimal or well-maintained base images like: FROM alpine:3.19 # or FROM python:3.11-slim 2. Pin Versions Explicitly Avoid surprises by pinning versions of dependencies and packages: RUN apt-get install -y curl=7.68.0-1ubuntu2.6 3. Combine RUN Commands Reduce layers by chaining commands: ...

Introduction In the Java ecosystem, Gradle and Maven are the two most popular build tools. Each offers a different approach to dependency management, configuration, and build automation. Gradle Overview Gradle uses a Groovy or Kotlin-based DSL. It’s highly customizable and optimized for performance via incremental builds and caching. Pros Faster builds with incremental compilation and daemon Flexible scripting with Groovy/Kotlin DSL Strong integration with Android Cons Steeper learning curve Harder to debug in complex configurations Maven Overview Maven relies on XML (pom.xml) for configuration. It’s declarative and standardized, which makes onboarding easier. ...

Introduction Containers revolutionized the way we package and deploy applications. Two major containerization technologies are LXC (Linux Containers) and Docker. While they serve similar purposes, their underlying architecture and usage differ significantly. What is LXC? LXC is a userspace interface for the Linux kernel containment features. It creates system-level containers that behave more like lightweight virtual machines. Key Characteristics System containers (can run full OS) Uses cgroups and namespaces directly Close to the kernel Pros Great for simulating full Linux environments Low overhead Flexible networking Cons More complex setup Less standardization across environments Not focused on developer UX What is Docker? Docker is a platform for developing, shipping, and running applications in containers. It builds on top of container runtimes and provides tooling, APIs, and images. ...