Docker Compose Generator

Build multi-container Docker applications visually and share configurations via URL.

Docker Compose Spec Version

Quick Add Service Preset

WEB-SERVER

Service Name

Docker Image

Ports (Host:Container, one per line)

Environment (KEY=value, one per line)

Volumes (HostPath:ContainerPath, one per line)

Restart Policy

If referencing local files (e.g. ./data), make sure the paths exist relative to your docker-compose.yml file.

docker-compose.yml

version: "3.9"

services:
  web-server:
    image: nginx:alpine
    ports:
      - "80:80"
    volumes:
      - ./html:/usr/share/nginx/html:ro
    restart: unless-stopped

Docker Compose Best Practices

Docker Compose allows you to define and manage multi-container applications easily. By declaring databases, backend processes, and caching servers under one file, you ensure that network communication between containers is wired automatically.

Named Volumes: Any volume path that does not begin with ./ or / is interpreted by Docker as a named volume. Named volumes are automatically provisioned and managed inside Docker's core directory, making them highly durable and optimal for storing databases like Postgres or MySQL.

Environment Secrets: Avoid committing credentials directly. In production, utilize a .env file in the same directory, then declare environment fields in your compose file without values (e.g. - POSTGRES_PASSWORD). Docker will pull values dynamically from the host environment or .env file automatically.

Built and maintained by Meet Shah · Last updated 19 July 2026

What this tool is used for

Producing a compose file with several services from a form.
Getting the ports, volumes and environment syntax right.
Producing a starting file you then extend.
Standardising compose structure across projects.
Generating a file for a stack you set up rarely.

Frequently Asked Questions

What is the minimum a service needs?: An `image` or a `build`. Everything else — ports, volumes, environment, networks — is optional, which is why a two-line Compose file is valid and why the format scales down to a single container as comfortably as up to a dozen.
Named volume or bind mount?: A named volume is managed by Docker and is the right choice for database storage — it survives recreation and performs better on macOS and Windows. A bind mount maps a host path and is for source code you are editing live.
Why publish to 127.0.0.1 rather than just the port?: Because `8080:80` binds every interface, exposing the container to your whole network. `127.0.0.1:8080:80` restricts it to the local machine. On a laptop on shared Wi-Fi that single prefix is the difference between a private dev server and a public one.
How do services find each other?: By service name on the default network — the web container reaches the database at `db:5432`, not at localhost. Each container has its own network namespace, which is why `localhost` inside a container means that container and nothing else.
Why does depends_on not prevent connection errors?: Because it waits for the container to have started, not for the service inside it to accept connections. A database is running long before it is ready, so either add a healthcheck with `condition: service_healthy` or make the application retry on startup.

Common errors and gotchas

Committing secrets in environment values rather than using an env file or a secret.
Binding a host path that only exists on your machine, which breaks for everyone else.
Exposing a database port to the host unnecessarily, which is a real exposure.
Omitting a depends-on and finding services race at startup.
Assuming depends-on waits for readiness, when it only waits for the container to start.