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

A tool by HashiCorp for securely managing secrets, encryption keys, and certificates with dynamic secret generation.

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

A file containing build rules and commands that automates compilation and common project tasks using the make utility.

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

Kubernetes ConfigMap

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

A CI/CD platform integrated into GitHub that automates build, test, and deployment workflows using YAML configuration.

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