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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.

Related Terms

Health Check
An endpoint or mechanism that reports whether an application is running correctly and ready to handle requests.
Blue-Green Deployment
A deployment strategy using two identical environments where traffic is switched from the old version to the new one instantly.
CI/CD
Continuous Integration and Continuous Deployment — automated practices for building, testing, and deploying code changes.
Chaos Engineering
The discipline of deliberately introducing failures into a system to test its resilience and identify weaknesses before they cause outages.
Docker Compose
A tool for defining and running multi-container Docker applications using a YAML configuration file.
Trunk-Based Development
A source control strategy where developers integrate small changes directly into the main branch frequently, often multiple times per day.
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