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Currently, `docker-compose --build-arg` requires that a service be specified as part of the command-line invocation. So, $ docker-compose build --build-arg nocache=`git rev-parse @` foom works. However, when using out-of-band scripts to automate the build process of several Docker containers (in a CI system, for instance), it becomes difficult to specify exactly which service requires the build-arg. Docker has supported Dockerfiles that ignore build-args for a long time, so there is no problem is specifying spurious build-args to builds that don't consume it. The limitation on `docker-compose build` today is artificial, and there are no other commands that require specifying a service. Allow `--build-arg` to also match all services so this is possible: $ docker-compose build --build-arg nocache=`git rev-parse @` Please refer to #3790 for discussion on the original feature. Signed-off-by: Ramkumar Ramachandra <artagnon@gmail.com>
Docker Compose
Compose is a tool for defining and running multi-container Docker applications. With Compose, you use a Compose file to configure your application's services. Then, using a single command, you create and start all the services from your configuration. To learn more about all the features of Compose see the list of features.
Compose is great for development, testing, and staging environments, as well as CI workflows. You can learn more about each case in Common Use Cases.
Using Compose is basically 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
docker-compose.ymlso they can be run together in an isolated environment. - Lastly, run
docker-compose upand Compose will start and run your entire app.
A docker-compose.yml looks like this:
version: '2'
services:
web:
build: .
ports:
- "5000:5000"
volumes:
- .:/code
redis:
image: redis
For more information about the Compose file, see the Compose file reference
Compose has commands for managing the whole lifecycle of your application:
- Start, stop and rebuild services
- View the status of running services
- Stream the log output of running services
- Run a one-off command on a service
Installation and documentation
- Full documentation is available on Docker's website.
- If you have any questions, you can talk in real-time with other developers in the #docker-compose IRC channel on Freenode. Click here to join using IRCCloud.
- Code repository for Compose is on GitHub
- If you find any problems please fill out an issue
Contributing
Want to help build Compose? Check out our contributing documentation.
Releasing
Releases are built by maintainers, following an outline of the release process.