DevOps Intermediate

What is Containerization?

A lightweight virtualization method that packages applications with their dependencies into isolated, portable containers.

Containers package code, runtime, libraries, and settings together, ensuring applications run identically everywhere. Unlike VMs, containers share the host OS kernel, making them faster to start and more resource-efficient.

Docker is the most popular containerization platform. Container images are built from Dockerfiles, stored in registries (Docker Hub, ECR), and orchestrated by Kubernetes or Docker Swarm for production deployments.

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Related Terms

Immutable Infrastructure

An approach where servers are never modified after deployment — changes require building and deploying entirely new server instances.

A tool for defining and running multi-container Docker applications using a YAML configuration file.

A technique that allows enabling or disabling features in production without deploying new code, enabling safe rollouts and A/B testing.

Chaos Engineering

The discipline of deliberately introducing failures into a system to test its resilience and identify weaknesses before they cause outages.

Blue-Green Deployment

A deployment strategy using two identical environments where traffic is switched from the old version to the new one instantly.

A structured analysis conducted after an incident to understand what happened, why, and how to prevent recurrence — without assigning blame.

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