GKGulshan Kumar

The DevOps Blog

Real-world write-ups on CI/CD pipelines, Kubernetes, AWS infrastructure, monitoring, DevSecOps, and lessons learned from production.

Kubernetes4 min read

Kubernetes Simulation from Scratch: Learn Kubernetes Internals

Stop just using Kubernetes. Start understanding it. I built a production-style Kubernetes simulation from scratch to explore real-world bare-metal setups.

1 Apr 2026Read more →
AI Agents3 min read

Building a Self-Healing Docker Agent with Ollama

If you don’t have access to paid coding agents, try running models locally using Ollama. Here is how I built a self-healing container agent with local LLMs.

25 Mar 2026Read more →
CI/CD8 min read

Blue-Green Deployments: Achieving Zero Downtime in Production

A deep dive into Blue-Green deployment strategy — how it works, how I implemented it at Onsurity to achieve zero-downtime releases, and the pitfalls to avoid.

15 Mar 2025Read more →
Security10 min read

Hardening Your AWS Infrastructure with WAF — A Practical Guide

How I configured AWS WAF with rate limiting, geo-blocking, and IP rules to mitigate OWASP Top 10 and DDoS threats at the application layer.

28 Feb 2025Read more →
CI/CD7 min read

Slashing CI/CD Runtime by 50% with GitHub Actions Optimization

Practical tips I used to reduce our GitHub Actions pipeline from 40 minutes to under 20 — caching, matrix builds, and smart job splitting.

10 Feb 2025Read more →
Kubernetes12 min read

Migrating from Docker Swarm to AWS EKS: What I Learned

Key decisions, gotchas, and architectural changes when moving production workloads from Docker Swarm to Amazon EKS for better scalability and observability.

20 Jan 2025Read more →
Observability9 min read

Production Monitoring with Prometheus & Grafana — Complete Setup

A complete walkthrough of setting up Prometheus and Grafana for production monitoring, alerting, and dashboards — with real configs from my setup.

5 Dec 2024Read more →