When you define your app with Compose in development, you can use this definition to run your application in different environments such as CI, staging, and production.
The easiest way to deploy an application is to run it on a single server, similar to how you would run your development environment. If you want to scale up your application, you can run Compose apps on a Swarm cluster.
You’ll almost certainly want to make changes to your app configuration that are more appropriate to a live environment. These changes may include:
restart: always) to avoid downtime
For this reason, you’ll probably want to define an additional Compose file, say
production.yml, which specifies production-appropriate configuration. This configuration file only needs to include the changes you’d like to make from the original Compose file. The additional Compose file can be applied over the original
docker-compose.yml to create a new configuration.
Once you’ve got a second configuration file, tell Compose to use it with the
$ docker-compose -f docker-compose.yml -f production.yml up -d
See Using multiple compose files for a more complete example.
When you make changes to your app code, you’ll need to rebuild your image and recreate your app’s containers. To redeploy a service called
web, you would use:
$ docker-compose build web $ docker-compose up --no-deps -d web
This will first rebuild the image for
web and then stop, destroy, and recreate just the
web service. The
--no-deps flag prevents Compose from also recreating any services which
web depends on.
You can use Compose to deploy an app to a remote Docker host by setting the
DOCKER_CERT_PATH environment variables appropriately. For tasks like this, Docker Machine makes managing local and remote Docker hosts very easy, and is recommended even if you’re not deploying remotely.
Once you’ve set up your environment variables, all the normal
docker-compose commands will work with no further configuration.
Docker Swarm, a Docker-native clustering system, exposes the same API as a single Docker host, which means you can use Compose against a Swarm instance and run your apps across multiple hosts.
Read more about the Compose/Swarm integration in the integration guide.
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