DevOps Intermediate

What is Container Registry?

A storage and distribution service for container images, similar to a package repository but for Docker images.

Container registries store, version, and distribute container images. Docker Hub is the default public registry. Private registries include Amazon ECR, Google Container Registry, Azure Container Registry, and GitHub Container Registry.

Features include vulnerability scanning, image signing, access control, and automated builds. Images are identified by repository:tag (e.g., nginx:1.25-alpine). Registry best practices include scanning for vulnerabilities, using specific tags (not latest), and implementing image retention policies.

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Docker Compose & Multi-Container Applications

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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.

An architectural style where an application is composed of small, independent services that communicate over APIs.

Kubernetes Secret

A Kubernetes object for storing sensitive data like passwords, tokens, and certificates, with base64 encoding and optional encryption at rest.

A server that acts as the single entry point for API requests, handling routing, authentication, rate limiting, and monitoring.

Chaos Engineering

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

A communication mechanism that enables asynchronous message passing between services, decoupling producers from consumers.

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