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

Continuous Integration and Continuous Deployment — automated practices for building, testing, and deploying code changes.

Trunk-Based Development

A source control strategy where developers integrate small changes directly into the main branch frequently, often multiple times per day.

Configuration Management

The practice of systematically managing and maintaining consistent server configurations across infrastructure.

The acceptable amount of unreliability allowed for a service, calculated as 100% minus the Service Level Objective.

A packaged, versioned output of a build process — such as a Docker image, JAR file, or compiled binary — ready for deployment.

Kubernetes ConfigMap

A Kubernetes object that stores non-sensitive configuration data as key-value pairs, injected into pods as environment variables or files.

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