6649e9aba3
self._project.client is a docker.client.Client, so creating a new self._project leaks (via the embedded connection pool) a bunch of Unix socket file descriptors for each test which overrides self.project using this mechanism. In my tests I observed the test harness using 800-900 file descriptor, which is OK on Linux with the default limit of 1024 but breaks on OSX (e.g. with Docker4Mac) where the default limit is only 256. The failure can be provoked on Linux too with `ulimit -n 256`. With this fix I have observed the process ending with ~100 file descriptors open, including 83 Unix sockets, so I think there is likely at least one more leak lurking. Signed-off-by: Ian Campbell <ian.campbell@docker.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.