DevOps

Prometheus is an open-source monitoring and alerting toolkit that was originally built at SoundCloud. Think of it as your application’s heartbeat monitor — constantly watching, collecting, and helping you understand what’s going on. 🧠 Why Prometheus? Imagine you’re running an application with hundreds of containers across multiple environments. How do you know if something’s slow or broken? Prometheus answers that by: Scraping metrics from your apps and infrastructure Storing data efficiently using a time-series database Letting you query metrics with a powerful language (PromQL) Alerting you when things go wrong 🔧 How It Works Prometheus works by pulling metrics from exporters (tiny HTTP servers that expose /metrics). For example: ...

What Is Kubernetes, Really? Imagine you’re running a lot of apps across many computers. How do you keep track of them all? How do you make sure that if one crashes, it restarts? What if you want to update one without breaking the others? That’s where Kubernetes comes in. Kubernetes (a.k.a. K8s) is an open-source system designed to help you deploy, manage, scale, and monitor containerized applications automatically. Think of it as the brains of your cloud-native app infrastructure. ...

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 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 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. ...