Docker Compose Has a Free Multi-Container Orchestration Tool

Docker Compose lets you define your entire stack — app, database, cache, message queue — in one YAML file. docker compose up starts everything. The Problem Your app needs PostgreSQL, Redis, and a background worker. Without Compose: docker run -d postgres docker run -d redis docker build -t myapp . docker run -d --link postgres --link redis myapp docker run -d --link postgres --link redis myapp-worker Five commands. Manual networking. No reproducibility. With Docker Compose # docker-compose.yml services : app : build : . ports : [ ' 3000:3000' ] depends_on : [ db , redis ] environment : DATABASE_URL : postgres://user:pass@db:5432/mydb REDIS_URL : redis://redis:6379 worker : build : . command : node worker.js depends_on : [ db , redis ] db : image : postgres:16 volumes : [ pgdata : /var/lib/postgresql/data ] environment : POSTGRES_PASSWORD : pass POSTGRES_DB : mydb redis : image : redis:7-alpine volumes : pgdata : docker compose up -d Entire stack running. Networking handled. Volumes per