49a4cb13b8
Previously, getAliases() unconditionally appended the service name as a network alias when useNetworkAliases was true. This caused containers to register their service name as an alias on external networks, leaking internal service discovery names into networks managed outside of Compose. Guard the service name alias behind an external-network check: only append it when the network is not marked as external. Explicitly configured aliases in the service network config are still passed through regardless. To make the behavior change discoverable, `up` now emits one warning per external network the project is connected to, listing the services whose service-name alias was skipped. Services that already declare their own name under networks.<net>.aliases are excluded, so the warning disappears once the user adopts the workaround. `create` and `run --use-aliases` are intentionally not warned about: `create` is rarely used standalone, and `run --use-aliases` produces ephemeral one-off containers where the warning would be noise. Fixes #8223 Signed-off-by: Stanislav Zhuk <stasadev@gmail.com> |
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Table of Contents
Docker Compose
Docker Compose is a tool for running multi-container applications on Docker
defined using the Compose file format.
A Compose file is used to define how one or more containers that make up
your application are configured.
Once you have a Compose file, you can create and start your application with a
single command: docker compose up.
Note
Docker Swarm used to rely on the legacy compose file format but did not adopt the compose specification so is missing some of the recent enhancements in the compose syntax. After acquisition by Mirantis swarm isn't maintained by Docker Inc, and as such some Docker Compose features aren't accessible to swarm users.
Where to get Docker Compose
Windows and macOS
Docker Compose is included in Docker Desktop for Windows and macOS.
Linux
You can download Docker Compose binaries from the release page on this repository.
Rename the relevant binary for your OS to docker-compose and copy it to $HOME/.docker/cli-plugins
Or copy it into one of these folders to install it system-wide:
/usr/local/lib/docker/cli-pluginsOR/usr/local/libexec/docker/cli-plugins/usr/lib/docker/cli-pluginsOR/usr/libexec/docker/cli-plugins
(might require making the downloaded file executable with chmod +x)
Quick Start
Using Docker Compose is a three-step process:
- Define your app's environment with a
Dockerfileso it can be reproduced anywhere. - Define the services that make up your app in
compose.yamlso they can be run together in an isolated environment. - Lastly, run
docker compose upand Compose will start and run your entire app.
A Compose file looks like this:
services:
web:
build: .
ports:
- "5000:5000"
volumes:
- .:/code
redis:
image: redis
Contributing
Want to help develop Docker Compose? Check out our contributing documentation.
If you find an issue, please report it on the issue tracker.
Legacy
The Python version of Compose is available under the v1 branch.