Either a path to a directory containing a Dockerfile, or a url to a git repository.When the value supplied is a relative path, it is interpreted as relative to the location of the Compose file.These topics describe version 3 of the Compose file format. There are several versions of the Compose file format – 1, 2, 2.x, and 3.x. For full details on what each version includes and how to upgrade, see About versions and upgrading.
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Other containers on the same network can use either the service name or this alias to connect to one of the service’s containers. This turns on sharing between container and the host operating system the PID address space.
Containers launched with this flag can access and manipulate other containers in the bare-metal machine’s namespace and vice versa. You can grant a service access to multiple secrets and you can mix long and short syntax.
In addition to Compose file format versions shown in the table, the Compose itself is on a release schedule, as shown in Compose releases, but file format versions do not necessarily increment with each release.
For example, Compose file format 3.0 was first introduced in Compose release 1.10.0, and versioned gradually in subsequent releases.
Or, set constraints on the service so that its tasks are deployed on a node that has the volume present. While it is possible to declare volumes on the file as part of the service declaration, this section allows you to create named volumes (without relying on ) that can be reused across multiple services, and are easily retrieved and inspected using the docker command line or API.
As an example, the On Docker 17.04 CE Edge and up, including 17.06 CE Edge and Stable, you can configure container-and-host consistency requirements for bind-mounted directories in Compose files to allow for better performance on read/write of volume mounts. See the docker volume subcommand documentation for more information.Optionally, you can configure it with the following keys: Specify which volume driver should be used for this volume.Defaults to whatever driver the Docker Engine has been configured to use, which in most cases is if you use docker stack deploy to launch the app in swarm mode (instead of docker compose up). It’s recommended that you use reverse-DNS notation to prevent your labels from conflicting with those used by other software. If you want to use a particular network on a common build, use [network] as mentioned in the second yaml file example. It’s recommended that you use reverse-DNS notation to prevent your labels from conflicting with those used by other software.Configures if and how to restart containers when they exit. For example if the value is surrounded by quotes (as is often the case of shell variables), the quotes are included in the value passed to Compose. Notes: If you’re using the version 2 or above file format, the externally-created containers must be connected to at least one of the same networks as the service that is linking to them. For a full list of supported logging drivers and their options, see logging drivers.Aliases (alternative hostnames) for this service on the network.Anonymous volumes do not persist after the associated containers are removed.