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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.This table shows which Compose file versions support specific Docker releases.
The default path for a Compose file is syntax - see variable substitution for full details.
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.
See Use volumes and Volume Plugins for general information on volumes.
Here’s an example of a two-service setup where a database’s data directory is shared with another service as a volume so that it can be periodically backed up: driver).
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 vise-versa. Either specify both ports (version: "3.1" services: redis: image: redis:latest deploy: replicas: 1 secrets: - source: my_secret target: redis_secret uid: '103' gid: '103' mode: 0440 secrets: my_secret: file: ./my_my_other_secret: external: true 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 necessairly 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.version: "3.2" services: web: image: nginx:alpine volumes: - type: volume source: mydata target: /data volume: nocopy: true - type: bind source: ./static target: /opt/app/static db: image: postgres:latest volumes: - "/var/run/postgres/postgres.sock:/var/run/postgres/postgres.sock" - "dbdata:/var/lib/postgresql/data" volumes: mydata: dbdata: volumes: # Just specify a path and let the Engine create a volume - /var/lib/mysql # Specify an absolute path mapping - /opt/data:/var/lib/mysql # Path on the host, relative to the Compose file - ./cache:/tmp/cache # User-relative path - ~/configs:/etc/configs/:ro # Named volume - datavolume:/var/lib/mysql version: "3.2" services: web: image: nginx:alpine ports: - "" volumes: - type: volume source: mydata target: /data volume: nocopy: true - type: bind source: ./static target: /opt/app/static networks: webnet: volumes: mydata: files, keep in mind that the tasks (containers) backing a service can be deployed on any node in a swarm, and this may be a different node each time the service is updated.In the absence of having named volumes with specified sources, Docker creates an anonymous volume for each task backing a service.Anonymous volumes do not persist after the associated containers are removed.