What is docker-compose used for?

Compose describes multi-container applications in one YAML file, so a full stack (app, database, cache) starts with a single docker compose up command.

What is the difference between ports and expose?

ports publishes a container port to the host (8080:80), while expose only documents that a port is used for inter-container traffic without binding it to the host.

How do volumes work in compose?

Volumes persist data beyond container restarts. Named volumes (db-data:/var/lib/postgresql/data) are managed by Docker; bind mounts (./src:/app) map host directories for live development.

Do I still need a version key in docker-compose.yml?

No — the version field is obsolete in the modern Compose specification and Docker ignores it. Current files simply start with services:.

Docker Compose Generator

Compose version:

Service 1

Service name

Image

Container name (opt)

Restart policy

Ports (host:container)

Environment (KEY=VALUE)

Volumes (host:container)

depends_on (comma-separated)

docker-compose.yml

version: '3.8'
services:
  service1:
    image: nginx:latest
    restart: unless-stopped
    ports:
      - "80:80"
    environment:
      - ENV=production

Generate docker-compose.yml files visually

Define services, ports, volumes, environment variables, and dependencies through a form and get a valid docker-compose.yml instantly. No YAML indentation errors, no memorizing the compose spec.

Frequently Asked Questions

What is docker-compose used for?: Compose describes multi-container applications in one YAML file, so a full stack (app, database, cache) starts with a single docker compose up command.
What is the difference between ports and expose?: ports publishes a container port to the host (8080:80), while expose only documents that a port is used for inter-container traffic without binding it to the host.
How do volumes work in compose?: Volumes persist data beyond container restarts. Named volumes (db-data:/var/lib/postgresql/data) are managed by Docker; bind mounts (./src:/app) map host directories for live development.
Do I still need a version key in docker-compose.yml?: No — the version field is obsolete in the modern Compose specification and Docker ignores it. Current files simply start with services:.

Generate docker-compose.yml files visually

Frequently Asked Questions

Related Tools