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A good place to start is the Getting Started tutorial which uses version 3 Compose stack files to implement multi-container apps, service definitions, and swarm mode. Another good reference is the Compose file for the voting app sample used in the Docker for Beginners lab topic on Deploying an app to a Swarm.This is also shown on the accordion at the top of this section.If your services or containers attempt to use more memory than the system has available, you may experience an Out Of Memory Exception (OOME) and a container, or the Docker daemon, might be killed by the kernel OOM killer. Any boolean values; true, false, yes no, need to be enclosed in quotes to ensure they are not converted to True or False by the YML parser. Logging options available depend on which logging driver you use The above example for controlling log files and sizes uses options specific to the json-file driver.To prevent this from happening, ensure that your application runs on hosts with adequate memory and see Understand the risks of running out of memory. Environment variables with only a key are resolved to their values on the machine Compose is running on, which can be helpful for secret or host-specific values. This option is ignored when deploying a stack in swarm mode with a (version 3) Compose file. These particular options are not available on other logging drivers.Defining a secret does not imply granting a service access to it.
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.
version: "3.7" services: redis: image: redis:alpine ports: - "6379" networks: - frontend deploy: replicas: 2 update_config: parallelism: 2 delay: 10s restart_policy: condition: on-failure db: image: postgres:9.4 volumes: - db-data:/var/lib/postgresql/data networks: - backend deploy: placement: constraints: [== manager] vote: image: dockersamples/examplevotingapp_vote:before ports: - "50" networks: - frontend depends_on: - redis deploy: replicas: 2 update_config: parallelism: 2 restart_policy: condition: on-failure result: image: dockersamples/examplevotingapp_result:before ports: - "50" networks: - backend depends_on: - db deploy: replicas: 1 update_config: parallelism: 2 delay: 10s restart_policy: condition: on-failure worker: image: dockersamples/examplevotingapp_worker networks: - frontend - backend deploy: mode: replicated replicas: 1 labels: [APP=VOTING] restart_policy: condition: on-failure delay: 10s max_attempts: 3 window: 120s placement: constraints: [== manager] visualizer: image: dockersamples/visualizer:stable ports: - "8080" stop_grace_period: 1m30s volumes: - "/var/run/docker.sock:/var/run/docker.sock" deploy: placement: constraints: [== manager] networks: frontend: backend: volumes: db-data: The topics on this reference page are organized alphabetically by top-level key to reflect the structure of the Compose file itself.
Top-level keys that define a section in the configuration file such as indent structure of the Compose file.
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.
Add metadata to the resulting image using Docker labels. We recommend that you use reverse-DNS notation to prevent your labels from conflicting with those used by other software.