Summary
This chapter introduces container orchestration concepts, detailing how to automatically scale, distribute load, and recover from failures for containerized services.

General domain of usage
Web applications

Now that you are familiar with **Docker** and know how to **containerize applications**, it's time to take the next step: learning how to **manage containerized applications at scale**, so they can automatically **scale**, **recover from failures**, and **run reliably** in any environment.

**Kubernetes (K8s)** is a platform for managing containerized applications. Simply put, it helps you run and control multiple containers at the same time.

Definition

Imagine you have a **web application** with several services: **frontend**, **backend**, and a **database**. You run each service in a separate **Docker container**. As your application gets more users, you need more copies of the **backend** to handle the increased load. Having extra copies allows requests to be spread across containers, reducing the load on each one and improving response times.

This is where **Kubernetes** comes in: it automatically creates new containers when needed, distributes the load, and ensures each service runs reliably.

In short, **Kubernetes** turns your set of containers into a smart, self-managing application that can **scale** and **recover from failures**.

# Why Use Kubernetes?

**Kubernetes** provides several key advantages, especially as your applications grow:

If your application experiences high traffic, Kubernetes can automatically spin up more containers to handle the load.

Automatic Scaling

If a container crashes, Kubernetes restarts it automatically, keeping your application running.

Self-Healing

Kubernetes distributes containers across servers to make the best use of available resources.

Efficient Resource Usage

Like Docker, Kubernetes ensures your application behaves the same way locally, on a teammate's machine, or in the cloud.

Environment Consistency

What does Kubernetes do when application traffic increases?

Lær det grunnleggende om DevOps og hvordan det effektiviserer programvareutvikling. Ved slutten vil du forstå sentrale prinsipper, automatisering og versjonskontroll for å sette opp en grunnleggende DevOps-arbeidsflyt.


Utforsk kjernebegrepene i DevOps og dets innvirkning på moderne utvikling. Ved slutten vil du ha kunnskap om CI/CD, Git versjonskontroll og automatisering for å bygge et solid grunnlag for DevOps-praksis.

Fordyp deg i grunnleggende CI/CD, Jenkins for automatisering, Docker og Kubernetes for containerbasert distribusjon, samt GitHub Actions for arbeidsflytautomatisering. Ved slutten vil du ha en fullstendig automatisert CI/CD-pipeline som integrerer utvikling, testing og distribusjon sømløst.

Du vil anvende sentrale DevOps-praksiser ved bruk av Infrastructure as Code (IaC)-verktøy som Terraform og Ansible. Hver oppgave er utformet for å hjelpe deg med å automatisere reelle infrastrukturkonfigurasjoner, noe som gjør systemene dine raskere å implementere, enklere å administrere og klare for vekst.

Lær hvordan du overvåker systemhelse og ytelse, setter opp varsler og bruker logger for dypere innsikt. Seksjonen dekker overvåkingsverktøy og loggføringspraksis for å sikre applikasjonspålitelighet.

Introduction to Kubernetes

What is Kubernetes?

Why Use Kubernetes?