394c8efe98
The Service.create_container() method fetches a list of the current containers in order to determine the next container number. In doing so, it makes several API calls: one to fetch the list of containers, then one per container in order to inspect it. In some situations it can happen that a container is removed after having been listed: in that case, the call to inspect will get a 404 and raise a NotFound. One situation in which this has been observed is when trying to concurrently create multiple one-off containers for the same service (using `docker-compose run` and a unique `--name`), as described in more detail in gh-5179. This patch adds a unit test that simulates the race between the calls to list and to inspect, and changes Service._next_container_number to skip removed containers instead of blowing up. Fixes gh-5179 Signed-off-by: Alberto Piai <apiai@sensational.ch>
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.