Behind the Scenes of Cloud & DevOps

     Imagine you’re at a huge music festival 🎶. There are different stages (services), and you need a way to find your favorite band (pod) without getting lost. That’s exactly what service discovery does in Kubernetes—it helps different parts of your application find and communicate with each other. What is Service Discovery? 🤔      Service discovery is the process of automatically detecting and connecting services within a system. In Kubernetes, applications are broken down into microservices, running as individual pods. Since pods are ephemeral and can be created and destroyed dynamically, hardcoding IP addresses just won’t work. That’s where Kubernetes service discovery comes in! The Two Types of Service Discovery in Kubernetes 🕵️‍♂️ Environment Variables-Based Discovery 🔧      When a pod starts, Kubernetes injects environment variables containing service information into the pod. And applications inside the pod can use these variable...

The Mysterious Land of AWS Kingdom     Once upon a time, in the vast AWS Kingdom, there were many digital citizens—EC2 , Lambda functions, users, and services—all trying to access different resources. But chaos loomed over the kingdom! Some citizens tried to access the S3 without permission. Others attempted to control EC2 without knowing the secret words. And worst of all—some citizens had ALL the power but were careless!       Then, King AWS decreed: "Let there be IAM!" and thus, IAM Roles and Policies were born to restore order. The Power of IAM Policies      Policies are like magical scrolls that define who can do what. These scrolls have a special language called JSON Example-  {     "Version": "2012-10-17",     "Statement": [         {             "Effect": "Allow",             "Action": "s3:GetObject",       ...

  Introduction      Imagine you are moving to a new house. You need to pack all your furniture, kitchen items, clothes, and essentials. But instead of randomly throwing things into a truck, you put everything neatly into labeled boxes. These boxes are easy to transport, and when you reach your new house, you simply unpack them exactly as they were.      Docker works the same way! It packages applications and their dependencies into containers , making them easy to move, run, and deploy anywhere. What is Docker?      Docker is a platform that helps developers build, ship, and run applications inside lightweight, portable containers. Think of it as a magic box that contains everything your application needs to run, no matter where it is deployed! Containers vs. Virtual Machines (VMs) Visualizing Containers vs. VMs: How Docker Works (Step-by-Step) Let's break it down into a fun pizza analogy! 🍕 Step 1: Dockerfile (The Recipe)  ...

Introduction      Linux provides powerful mechanisms for process isolation and resource management, which are essential for containers, security, and system administration. Two key technologies enabling this are namespaces and control groups (cgroups) . While namespaces isolate processes, cgroups manage and limit their resource usage. Understanding how these technologies work together helps in designing scalable and secure containerized environments. Understanding Linux Namespaces      Linux namespaces enable process isolation by creating independent execution environments. Each namespace provides its own view of a specific system resource. When a process is placed in a namespace, it perceives only the resources assigned to that namespace, isolating it from the rest of the system. Types of Namespaces PID Namespace : Isolates process IDs, ensuring that processes within a namespace cannot see or interact with those outside it. Network Namespace : Provides is...

  Introduction      Once upon a time in the vast world of computing, servers ran applications like kings ruling their kingdoms. But as demands grew, developers sought ways to optimize resources. Enter containers , a revolutionary way to run applications in isolated environments. However, with great power came great responsibility— how do you manage resources efficiently in this new world? This is the tale of cgroups (Control Groups) , the invisible force that ensures fairness, efficiency, and order in the land of containers. The Birth of Chaos: A World Without cgroups      Imagine a kingdom where everyone eats from the same pot without limits. Some take more than they need, leaving others hungry. This was the state of computing before cgroups—processes could consume CPU, memory, and disk I/O unchecked, often leading to system crashes.      Developers faced a nightmare when running multiple applications on the same machine. A memory-hungr...