Docker-compose.yml
docker-compose.yml is a declarative YAML configuration file that defines Docker Compose application services and their containers, networks, volumes, and runtime settings.
Learn Docker in a Month of Lunches, Second Edition
A Docker Compose file is a declarative configuration file that defines a multi-container application and its services.
- How it is used
- Defines an application’s desired state so Docker Compose can start its services and create required resources on one machine.
- How deep it goes
- Works through YAML structure, service settings, lifecycle commands, and environment overrides; distinguishes one-time application from continuous reconciliation.
- Examples
- Uses a single-service to-do app, a three-service image gallery, and exercises for persistent databases and monitoring containers.
- What you can do after
- Build it from scratch: define and run a multi-container app, then adapt its configuration for development and test.
Read how Learn Docker in a Month of Lunches, Second Edition explains docker-compose.yml →
Road to Kubernetes
A Compose file is a YAML configuration file that declares the services, parameters, networks, volumes, and other settings for a Docker Compose application.
- How it is used
- Stores container build and run parameters so services can be started without reconstructing long Docker commands.
- How deep it goes
- Works through service fields, commands, multi-service volumes, and environment-specific files; defers additional database-driver setup.
- Examples
- Uses Python and Node.js web services, a Redis-backed stack, and a production configuration deployed to a virtual machine.
- What you can do after
- Operate/configure it to build, run, stop, and adapt containerized services across local and production environments.
Build Financial Software with Generative AI (From Scratch)
A docker-compose.yml file is a YAML configuration file that defines services, networks, volumes, and related settings for Docker Compose applications.
- How it is used
- Coordinates building and starting related application services from a centralized configuration.
- How deep it goes
- Works through service builds, ports, volumes, build arguments, and common connection failures rather than Compose internals.
- Examples
- Uses CloudBeaver, a FastAPI files API, WSO2 API Manager, WireMock, PostgreSQL, and a dashboard as service examples.
- What you can do after
- Operate/configure it to build and start services, expose ports, mount local files, and resolve port or container-address conflicts.
Read how Build Financial Software with Generative AI (From Scratch) explains docker-compose.yml →
Build Python Web Apps with Streamlit
A docker-compose.yml file is a YAML configuration file that defines services, builds, networking, and other settings for Docker Compose.
- How it is used
- Centralizes Docker runtime instructions so applications start consistently without retyping complex build, port, and volume commands.
- How deep it goes
- Defines services, builds, port mappings, and volumes, then adapts mounts for Elastic Beanstalk without detailing YAML syntax broadly.
- Examples
- Uses a Streamlit service with port 8502:8501 and a .streamlit volume, then changes the mapping to port 80 for Elastic Beanstalk.
- What you can do after
- Operate Docker applications through docker-compose up with configured builds, networking, and mounted Streamlit secrets.
Read how Build Python Web Apps with Streamlit explains docker-compose.yml →
Related concepts
- Docker Composeused by · Docker Compose is a tool for defining and running applications composed of multiple containers through declarative configuration.
- port mappingconfigures · Port mapping forwards network traffic from a port in one network environment to a port in another, such as from a host to a container.
- Dockerfileuses · A Dockerfile is a text file containing declarative instructions for building a container image and specifying its contents and runtime metadata.
- API keyconfigures · An API key is a credential used to identify or authorize a client accessing an application programming interface.
- YAMLuses · YAML is a human-readable data-serialization standard for representing structured data, including mappings, sequences, and scalar values.
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