Author

Rajesh Kumar

@rky211

articles: 51
total claps: 462
top claps: 100
avg read: 6.2 min
paywalled: 17
active: 2021-12-17 → 2026-07-25

Wiki topics

LLM · Large Language Models · 10 AI · AI · General · 10 ☁️ · DevOps & Cloud · 10 💻 · Programming · 7 RAG · RAG & Retrieval · 7 AGT · AI Agents · 5 🌐 · Web Development · 5 🏃 · Running & Endurance · 4

Top tags

#kubernetes ·7 #ansh ·7 #trains ·6 #ambulance ·6 #services ·6 #claude-code ·5 #astrologer-in-bangalore ·5 #honest-astrologer ·5 #genuine-astrologer ·5 #best-astrologer ·5

MDA TCH

RA Rajesh Kumar

React Routing Part 1: The Story From Roads to Routes

Understanding routing conceptually before touching any library will save you countless hours of confusion.

Apr 24, 2026 · 8 min read · 100 claps #react-router #routing #route

React Routing Part 1: The Story From Roads to Routes

TCH AI SPT

RA Rajesh Kumar

Minio is Dead:A Guide to Velero + Garage S3 for RKE2 Clusters

When you run Kubernetes at home, backups are optional until they are not. I learned this the hard way. I had two clusters running, and one…

Feb 24, 2026 · 11 min read · 70 claps paywalled #garage #velero #backup

Minio is Dead:A Guide to Velero + Garage S3 for RKE2 Clusters

ECO MDA AI TCH SCI

RA Rajesh Kumar

Building a Live Stock Portfolio Tracker in Python with yfinance and Rich

A beginner Python project: fetch live NSE/US stock prices, calculate P&L, and display a colour-coded terminal dashboard, no API key…

May 11, 2026 · 11 min read · 61 claps paywalled #python #stock-market #programming

Building a Live Stock Portfolio Tracker in Python with yfinance and Rich

AI HUM TCH

RA Rajesh Kumar

I Built a BPE Tokenizer From Scratch in Python And Finally Understand How LLMs Work

I built a BPE tokenizer, the same tokenization algorithm used inside ChatGPT, GPT-4, and Qwen3 etc from scratch in plain Python.

May 28, 2026 · 17 min read · 43 claps paywalled #artificial-intelligence #python #machine-learning

I Built a BPE Tokenizer From Scratch in Python And Finally Understand How LLMs Work

AI GEN

RA Rajesh Kumar

RAG Strategies Part 3: Embeddings — How Your RAG System Learns to Understand Meaning

In this article, we’ll finally unlock the missing piece that turns your RAG system from “keyword matcher” into something that actually…

Apr 16, 2026 · 10 min read · 37 claps paywalled #embedding #cosine-similarity #rags

RAG Strategies Part 3: Embeddings — How Your RAG System Learns to Understand Meaning

TCH

RA Rajesh Kumar

Controller-gen: Building a Custom Kubernetes CRD Without kubebuilder

A few months back I built a Kubernetes operator from scratch in Go. It watches HTTPRoute resources and automatically syncs them to…

Jun 11, 2026 · 10 min read · 25 claps paywalled #kubernetes #kubernetes-crds #kubernetes-operator

Controller-gen: Building a Custom Kubernetes CRD Without kubebuilder

RA Rajesh Kumar · engineering-udaan

How udaan cut SQL database costs by 50% without sacrificing performance

Overview

Apr 30, 2026 · 8 min read · 25 claps #sql #cost-optimization #scaling

How udaan cut SQL database costs by 50% without sacrificing performance

TCH HUM

RA Rajesh Kumar

Deep Dive: Understanding the read() System Call From File Descriptors to Data Flow

Master Linux read() system calls with hands-on strace examples. Learn why buffer size ≠ bytes read, detect EOF, debug partial reads, and…

Nov 14, 2025 · 13 min read · 16 claps paywalled #strace #linux #troubleshooting

TCH SPT

RA Rajesh Kumar

How I Run Virtual Kubernetes Clusters with k3k, ArgoCD and Cloudflare Tunnels

Running multiple isolated Kubernetes environments in a homelab usually means either spinning up separate VMs which are expensive on…

Jun 14, 2026 · 15 min read · 14 claps paywalled #k3k #virtual-cluster #kubernetes

How I Run Virtual Kubernetes Clusters with k3k, ArgoCD and Cloudflare Tunnels

TCH

RA Rajesh Kumar

Building a Kubernetes Operator from Scratch: Automate Cloudflare Tunnel with HTTPRoute

I run a home lab on Proxmox. Kubernetes cluster, a bunch of self-hosted services sitting inside VMs with no public IP. In a previous…

Apr 27, 2026 · 15 min read · 13 claps paywalled #kubernetes #cloudflare-tunnel #go-operator

Building a Kubernetes Operator from Scratch: Automate Cloudflare Tunnel with HTTPRoute

TCH SPT

RA Rajesh Kumar

How to Set Up Cloudflare Tunnel on Kubernetes and How It Actually Works Inside

I spent a good chunk of time recently setting up Cloudflare Tunnel to expose services running inside a Kubernetes cluster that lives on VMs…

Apr 24, 2026 · 10 min read · 12 claps paywalled #kubernetes #cloudflare #devops

How to Set Up Cloudflare Tunnel on Kubernetes and How It Actually Works Inside

LIF SPR

RA Rajesh Kumar

Context-Aware Shell Aliases: Never Forget Your Shortcuts Again

I built dozens of shell aliases over months. purn to grab Pulumi resource URNs. kgp instead of kubectl get pods. Each one saved keystrokes…

Oct 07, 2025 · 12 min read · 10 claps paywalled #terminal #bash #zshrc

Context-Aware Shell Aliases: Never Forget Your Shortcuts Again

TCH

RA Rajesh Kumar

Why Proxmox VMs Lose Network After Installing RKE2 on the Host

I was setting up new VMs on my Proxmox homelab. Standard stuff, bridged networking on vmbr0, DHCP enabled, expected an IP in seconds…

Apr 15, 2026 · 6 min read · 9 claps paywalled #proxmox #kubernetes #calico

Why Proxmox VMs Lose Network After Installing RKE2 on the Host

RA Rajesh Kumar

Claude Code Memory: Project, Local, Folder, and Machine-Level CLAUDE.md

Learn how Claude Code loads memory across projects, folders, and your machine and how to use each memory level to get more accurate…

Jun 18, 2026 · 7 min read · 6 claps #claude-code-memory #claude-md #claude-code

Claude Code Memory: Project, Local, Folder, and Machine-Level CLAUDE.md

TCH

RA Rajesh Kumar

iPXE + Harvester: Automate Kubernetes Hypervisor Deployment in 15 Minutes

Skip the 6GB downloads and manual clicking — network boot your way to production-ready HCI

Jul 03, 2025 · 7 min read · 6 claps paywalled #linux #installation #ipxe

iPXE + Harvester: Automate Kubernetes Hypervisor Deployment in 15 Minutes

TCH

RA Rajesh Kumar

Kubernetes Pod Security Context: Harden Containers With Seccomp, Capabilities, And Resource Limits

Most people, including me for a long time, copy security context fields from examples online and move on. The fields look right, the pod…

Jun 09, 2026 · 9 min read · 5 claps paywalled #kubernetes #golang #devops

Kubernetes Pod Security Context: Harden Containers With Seccomp, Capabilities, And Resource Limits

SPT TCH

RA Rajesh Kumar

Python Stock Tracker: Modules, Fundamentals, and CLI Flags with argparse

How splitting a 300-line file into five modules made it easier to extend, plus caching fundamentals data and adding command line flags with…

May 14, 2026 · 8 min read · 5 claps paywalled #python #yfinance #free-python-tutorials

Python Stock Tracker: Modules, Fundamentals, and CLI Flags with argparse

RA Rajesh Kumar

Part 2: Claude Code Advanced Tools and Automation

From web research to autonomous agents, discover the tools that make Claude Code a powerful AI development assistant

Jun 08, 2026 · 6 min read · 2 claps #claudetools #claude-code-tips #agents

Part 2: Claude Code Advanced Tools and Automation

AI TCH

RA Rajesh Kumar

Claude Code in Action : How AI Coding Assistants Works

A coding assistant is more than just a tool that writes code, let’s see how these assistants work behind the scenes.

May 25, 2026 · 7 min read · 1 claps #ai-tools #vibe-coding #ai-coding-assistant

Claude Code in Action : How AI Coding Assistants Works

RA Rajesh Kumar

Claude Code: Adding context

Learn why context is the foundation of AI-assisted development and how techniques like /init, CLAUDE.md, /memory, and @file references help…

Jun 14, 2026 · 6 min read · 1 claps #claude-md #context-engineering #context

AI GEN

RA Rajesh Kumar

Why Simple Keyword Search Fails in RAG Chunk Retrieval And Why Embeddings Are Needed

When developers first start building Retrieval-Augmented Generation (RAG) systems, they often begin with a simple idea: keyword matching.

Mar 17, 2026 · 4 min read · 1 claps paywalled #agentic-rag #retrieval-augmented-gen #embedding

Why Simple Keyword Search Fails in RAG Chunk Retrieval And Why Embeddings Are Needed

TCH MDA SPT

RA Rajesh Kumar

Securing Every Service Using Cloudflare Zero Trust Without Touching The Dashboard

You have ten services running in your home lab. ArgoCD, Rancher, Vault, Grafana, and a handful of others. They are all exposed via…

Jun 17, 2026 · 31 min read · 0 claps paywalled #kubernetes #cloudflare #zero-trust-security

Securing Every Service Using Cloudflare Zero Trust Without Touching The Dashboard

RA Rajesh Kumar

Cosine Similarity in AI

Turning meaning into numbers and comparing it with angles

Apr 06, 2026 · 8 min read · 0 claps paywalled #cosine-similarity #cosine #generative-ai-tools

AI SPT

RA Rajesh Kumar

Part 1: Claude Code Basic Core Tools

From terminal commands to task tracking: understanding Claude Code’s core capabilities through real-world examples

Jun 03, 2026 · 7 min read · 0 claps #claude-code #claude-tool-use #tools

LIF TCH

RA Rajesh Kumar

How to Write HTML Faster Using Emmet and VS Code Snippets

Learn how to use Emmet shortcuts and VS Code snippets to speed up your HTML workflow, reduce repetition, and make coding feel effortless.

Jan 27, 2026 · 6 min read · 0 claps #emmet #vscode-extension #snippet