DevOps Intermediate

What is Docker Compose?

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

Docker Compose defines multi-container applications in a docker-compose.yml file. Services, networks, and volumes are declared, and a single command (docker compose up) starts everything. This is ideal for development environments and simple deployments.

A typical configuration includes application server, database, cache (Redis), and reverse proxy containers with defined dependencies, environment variables, port mappings, and volume mounts.

Related Terms

Canary Deployment

A deployment strategy that gradually rolls out changes to a small subset of users before deploying to the entire infrastructure.

Infrastructure Drift

The divergence between the actual state of infrastructure and its defined desired state, caused by manual changes or untracked modifications.

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

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

The practice of collecting, analyzing, and alerting on system metrics and logs to ensure application health and performance.

Chaos Engineering

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

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