Rajesh Kumar

here’s an up-to-date, Meta-supported shortlist of 20 global WhatsApp Business Solution Providers (BSPs), each with quick “about / pros / cons,” plus a compact pricing-model table. (Meta’s…

The cheapest WhatsApp Business API provider from India in 2026 is WAPI (wapi.in.net), closely followed by BOL7 and WABA Connect, all offering transparent, low-cost plans designed for…

Here’s your end-to-end, no-gaps guide. I’ll keep the vocabulary crisp and the mental model consistent. The layers “KafkaConsumer is NOT thread-safe” — what this actually means Unsafe…

using Laravel Passport—the oauth_access_tokens table balloons when tokens aren’t expiring, not being revoked on logout, or not being purged. Here’s a practical, safe cleanup + prevention plan…

It covers Android SDK, Java (JDK), Flutter, Path wiring, Plugin setup, Validation, AVD/emulator, and creating a project—plus quick fixes. Assumptions: default shell = zsh, Apple Silicon path…

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…

Area Sub‑Area Action Items 0) Readiness & Goals SLOs & Metrics Define business SLOs, Core Web Vitals, establish baselines, create dashboards, prepare test data Profiling Enable APM/Tracing,…

Here’s a clear, end-to-end tutorial you can keep handy. It explains what “socket-based” vs “TCP-based” really means, how to tell which one you’re using, and how to…

Here’s a clean, up-to-date, “everything you need” CLI guide you can keep nearby. I’ll cover: I’m using Keycloak 26.x syntax (matches the 26.3.x you’re running). kc.sh —…

To run Keycloak 17+ (Quarkus) with MySQL on the same server (XAMPP/LAMPP). It covers two supported setups. Pick A (TCP) for a production-style config, or B (UNIX…

These tutorials and channels provide a mix of free and paid content, catering to different levels of expertise and covering the entire spectrum of DevOps tools and…

DevOps adoption improves IT and developer collaboration leading to faster delivery. Organizations use this strategy to improve software security, resolve issues quickly, and reduce errors. You need…

I’ll cover Apache Kafka core terms, Confluent Platform extensions, and Confluent Cloud additions. Kafka & Confluent Terminology – Complete Glossary 🔹 Core Kafka Concepts 🔹 Kafka Internals…

To train a machine learning or AI model, the hardware requirements depend heavily on the type of model, the dataset size, and whether you’re doing training from…

The file .github/CODEOWNERS is a special configuration file used by GitHub to define who is responsible for different parts of a repository’s codebase. Here’s a breakdown: 📌…

5 Days Program Advanced performance engineering in .NET: Category Tool(s) Why it’s the best (quick note) Code Profiling & Debugging Visual Studio Profiler, JetBrains dotTrace Deep CLR…

when we talk specifically about Advanced Performance Engineering for .NET programs and software, the toolset is a bit different from Java, Python, or C++ because of the…

Here are the advanced performance engineering tools commonly used by developers for .NET programs and software in 2026: Category Tool(s) Why it’s the best (quick note) Code…

let’s go step-by-step so Kafka partitions and consumer groups are crystal clear. 1. Kafka Partition Think of a Kafka topic as a folder and partitions as the…

What is ITSM? IT service management (ITSM) is a framework for managing and delivering IT services. It is a set of processes and best practices that help…

Keycloak: Identity & SSO Tool (IAM in one box) What it is Keycloak is an open-source Identity and Access Management (IAM) platform that provides Single Sign-On (SSO),…

Absolutely! Ansible Tower (now called Controller in AAP) has a robust, well-documented REST API. You can use it to automate everything you do via the web UI—launch…

Below is a detailed Ansible tutorial covering execution strategies (linear vs free), task delegation, fact caching, and async jobs—with clear code examples, explanations, and a professional tutorial…

What is Ansible Collection? Ansible Collections are a standardized packaging format for distributing Ansible content (roles, modules, plugins, playbooks, and documentation). Introduced in Ansible 2.9+, collections allow…

Here’s a very detailed, step-by-step tutorial on Ansible Collections—covering what they are, why you need them, how to use them, how to create your own, and key…

What is Unit Testing in Ansible? Unit testing in Ansible refers to testing the smallest pieces of code within Ansible—primarily custom modules, plugins, or Ansible-related Python code—in…

Here’s a comprehensive tutorial on all the ways to define and use variables in Ansible inventory/hosts, covering every major approach—including their best use cases and clear examples…

Below is a simple dynamic inventory Bash script for Ansible that queries all EC2 instances in your AWS account, gets their public IPs, and outputs a valid…