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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 servicesfrom your configuration. To learn more about all the features of Composesee .
Compose is great for development, testing, and staging environments, as well asCI workflows. You can learn more about each case in.
Using Compose is basically a three-step process.
Dockerfile
so it can bereproduced anywhere.docker-compose.yml
sothey can be run together in an isolated environment.docker-compose up
and Compose will start and run your entire app.A docker-compose.yml
looks like this:
web: build: . ports: - "5000:5000" volumes: - .:/code links: - redisredis: image: redis
For more information about the Compose file, see the
Compose has commands for managing the whole lifecycle of your application:
The features of Compose that make it effective are:
Compose uses a project name to isolate environments from each other. You can usethis project name to:
The default project name is the basename of the project directory. You can seta custom project name by using the or the.
Compose preserves all volumes used by your services. When docker-compose up
runs, if it finds any containers from previous runs, it copies the volumes fromthe old container to the new container. This process ensures that any datayou’ve created in volumes isn’t lost.
Compose caches the configuration used to create a container. When yourestart a service that has not changed, Compose re-uses the existingcontainers. Re-using containers means that you can make changes to yourenvironment very quickly.
Compose supports variables in the Compose file. You can use these variablesto customize your composition for different environments, or different users.See for moredetails.
You can extend a Compose file using the extends
field or by creating multipleCompose files. See for more details.
Compose can be used in many different ways. Some common use cases are outlinedbelow.
When you’re developing software, the ability to run an application in anisolated environment and interact with it is crucial. The Compose commandline tool can be used to create the environment and interact with it.
The provides a way to document and configureall of the application’s service dependencies (databases, queues, caches,web service APIs, etc). Using the Compose command line tool you can createand start one or more containers for each dependency with a single command(docker-compose up
).
Together, these features provide a convenient way for developers to getstarted on a project. Compose can reduce a multi-page “developer gettingstarted guide” to a single machine readable Compose file and a few commands.
An important part of any Continuous Deployment or Continuous Integration processis the automated test suite. Automated end-to-end testing requires anenvironment in which to run tests. Compose provides a convenient way to createand destroy isolated testing environments for your test suite. By defining the fullenvironment in a you can create and destroy theseenvironments in just a few commands:
$ docker-compose up -d$ ./run_tests$ docker-compose stop$ docker-compose rm -f
Compose has traditionally been focused on development and testing workflows,but with each release we’re making progress on more production-oriented features.You can use Compose to deploy to a remote Docker Engine. The Docker Engine maybe a single instance provisioned with or an entire cluster.
For details on using production-oriented features, see in this documentation.
To see a detailed list of changes for past and current releases of DockerCompose, please refer to the.
Docker Compose is under active development. If you need help, would like tocontribute, or simply want to talk about the project with like-mindedindividuals, we have a number of open channels for communication.
To report bugs or file feature requests: please use the .
To talk about the project with people in real time: please join the#docker-compose
channel on freenode IRC.
To contribute code or documentation changes: please submit a .
For more information and resources, please visit the .
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