Author: Rajesh Kumar

Rajesh KumarI’m a DevOps/SRE/DevSecOps/Cloud Expert passionate about sharing knowledge and experiences. I have worked at Cotocus. I share tech blog at DevOps School, travel stories at Holiday Landmark, stock market…

The Rundeck Project SCM Export and SCM Import features are designed to version control your job definitions and project configuration, by integrating Rundeck projects with a source control management system…

Here’s a complete guide to running Ansible Playbooks using Rundeck, covering all supported methods, including what you’ve done, plus troubleshooting options and best practices. ✅ Goal Run an Ansible Playbook…

🛡️ What is Fortify? Fortify is a Static Application Security Testing (SAST) tool developed by Micro Focus (now part of OpenText). It helps developers and security teams identify vulnerabilities early…

System Requirements for Rundeck Supported Operating Systems: Amazon EC2 Supported Database. Supported Log store Others Important Network access How to Install Rundeck OSS in Ubtunu? Step 1- Install Java $…

Excellent question. When we say AWS ALB “downgrades HTTP/2 → HTTP/1.1”, it means that although the client connects to ALB over HTTP/2, ALB then connects to your backend (e.g., EKS…

That’s a great question. The reason it’s hard to visually spot the difference in a gRPC request is because it’s a binary protocol over HTTP/2, unlike human-readable formats like REST…

Here’s a complete and standalone guide to gRPC, suitable for beginners and intermediate engineers who want to use gRPC in real-world applications, especially in a cloud-native or AWS-based architecture. 🌐…

This guide covers the most common communication protocols used in modern cloud-native architectures, compares their capabilities, and discusses when to use each. It also analyzes support and limitations within the…

Rundeck Student Assignments (Windows Local Node) 📝 Setup Prerequisites: 🎓 Assignment List Assignment 1: Hello World in PowerShell Objective: Run a basic PowerShell script as a Rundeck job. Assignment 2:…

Rundeck Student Assignments (Local Node Only) — Assignment 1: Hello World Job Objective: Learn to create and execute your first Rundeck job. Assignment 2: Disk Usage Check Objective: Monitor disk…

✅ What is Rundeck? Rundeck is an open-source tool used for Runbook Automation, designed to help DevOps teams, SREs, and IT operations teams automate routine tasks, reduce toil, and manage…

Here’s a clear explanation of the Rundeck Basic Workflow, perfect for beginners or teams implementing Rundeck for the first time. 🔄 Rundeck Basic Workflow: Step-by-Step This describes the standard flow…

Here’s a curated list of the 21 most popular and widely adopted DevSecOps tools in 2025, along with short descriptions and a summary comparison table at the end. 🔐 Top…

Here is a very comprehensive, feature-by-feature comparison between Argo CD and Flux, including: 📊 Feature-by-Feature Comparison: Argo CD vs Flux Feature Argo CD Flux GitOps Core Functionality ✅ Yes ✅…

Here are some 100% free, full-page, mobile-friendly WordPress themes ideal for technical blogging — clean code, responsive design, fast performance, and great typography for long-form content. ✅ Top Free WordPress…

Increasing the upload file size limit in WordPress allows you to upload larger images (or other media) without errors. Many hosting providers set a default upload limit (often anywhere from…

Here’s a comprehensive list of top real-time collaborative, web-based text editors, including both open-source/self-hostable and cloud/SaaS platforms. Each tool includes its key features, and a feature-by-feature comparison follows to help…

GitHub Organization Policies are rules and settings enforced at the organization level to control how repositories, members, and integrations behave. These policies help you: 📘 Section 1: What are GitHub…

A GitHub App Installation Token is a short-lived access token that allows a GitHub App to interact with specific repositories or organizations where it has been installed — on behalf…

🧠 What is a GitHub App? A GitHub App is a first-class actor in the GitHub ecosystem. Unlike OAuth apps which act on behalf of a user, GitHub Apps have…

🚀 What is Google Cloud NAT? Google Cloud NAT (Network Address Translation) is a fully managed service that enables outbound internet connectivity for resources in private Google Cloud VPC subnets,…

Source – https://github.com/rajeshkumarin/k8s-500-prod-issues 📘 Scenario #1: Zombie Pods Causing NodeDrain to HangCategory: Cluster ManagementEnvironment: K8s v1.23, On-prem bare metal, Systemd cgroupsScenario Summary: Node drain stuck indefinitely due to unresponsive terminating…

📌 What is Google Cloud CDN? Google Cloud CDN is a globally distributed content delivery network that accelerates the delivery of your web and media content by caching it closer…