What is Docker? Docker is a tool that makes it easier to create, deploy, and run applications using containers. Why use Docker? Imagine you built an app that works perfectly on your machine. You send it to your teammate, and suddenly… it doesn’t work! Different OS, different dependencies, different versions — it’s a mess. Docker solves this by putting your app and everything it needs into a container. A container is like a box with your app, its settings, and all dependencies — isolated and portable. ...

Introduction How does Kubernetes know where to send traffic for your services? That’s the job of kube-proxy. Whether you’re accessing a ClusterIP, NodePort, or LoadBalancer — kube-proxy is working behind the scenes to route traffic correctly. Let’s unpack how it works in a way that’s easy to understand. What is kube-proxy? kube-proxy is a network component that runs on every node in your Kubernetes cluster. It’s responsible for: Handling traffic for Kubernetes Services Managing IP rules and routing Forwarding requests to the right Pods kube-proxy acts like a traffic router inside your Kubernetes cluster. ...

Introduction Ever wondered who actually starts, stops, and monitors containers on your Kubernetes node? That’s the job of kubelet — the silent agent that lives on every node and makes sure containers are running as expected. Let’s explore kubelet in a clear and friendly way. What is kubelet? kubelet is an agent that runs on each Kubernetes node. It talks to the control plane and makes sure the containers assigned to that node are healthy and running. ...

Introduction Kubernetes is powerful, but what’s the brain behind all those kubectl commands? That role is played by the kube-apiserver — the front door to your Kubernetes cluster. Everything goes through it: creating pods, scaling deployments, checking health — you name it. Let’s break it down in a way that’s easy to understand. What is kube-apiserver? kube-apiserver is the central communication hub of Kubernetes. It exposes the Kubernetes API and handles: ...

Introduction One of the magical things about Kubernetes is that it just knows how to restart pods, create replicas, or handle node failures. But how? Behind the scenes, there’s a key component called kube-controller-manager. Let’s demystify what it does — and why it’s essential. What is kube-controller-manager? It’s a Kubernetes control plane component that runs multiple controllers — small control loops that handle routine tasks. Think of it like an army of little workers keeping your cluster healthy and aligned with your YAML definitions. ...