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UNIX file permission modes, you may find this Configs cannot be writableīecause they are mounted in a temporary filesystem, so if you set the writableīit, it is ignored.

mode: The permissions for the file that is mounted within the service’s.

uid and gid: The numeric UID or GID that owns the mounted config file.

target: The path and name of the file to be mounted in the service’s.

source: The identifier of the config as it is defined in this configuration.

The long syntax provides more granularity in how the config is created within my_config.txt my_other_config : external : true Long syntax Version : ' 3.9' services : redis : image : redis:latest deploy : replicas : 1 configs : - my_config - my_other_config configs : my_config : file. The stack deployment fails with a config not found error.Ĭonfig definitions are only supported in version 3.3 and higher of the My_other_config is defined as an external resource, which means that it hasĪlready been defined in Docker, either by running the docker config createĬommand or by another stack deployment. My_config is set to the contents of the file. The following example uses the short syntax to grant the redis serviceĪccess to the my_config and my_other_config configs. The source name and destination mountpoint are both set This grants theĬontainer access to the config and mounts it at / The short syntax variant only specifies the config name. Of this stack file, or stack deployment fails.įor more information on configs, see configs.

Note: The config must already exist or beĭefined in the top-level configs configuration Two different syntax variants are supported. Grant access to configs on a per-service basis using the per-service configsĬonfiguration.

This section contains a list of all configuration options supported by a serviceĬonfiguration options that are applied at build time.īuild can be specified either as a string containing a path to the buildĬommand : configs You can use environment variables in configuration values with a Bash-like Specify them again in docker-compose.yml. Likewise, network and volume definitions are analogous toĭocker network create and docker volume create.Īs with docker run, options specified in the Dockerfile, such as CMD,ĮXPOSE, VOLUME, ENV, are respected by default - you don’t need to yaml extension for this file.Ī service definition contains configuration that is applied to eachĬontainer started for that service, much like passing command-line parameters toĭocker run. This maps to the : : indent structure of theĬompose file. Networks, and so on, are listed with the options that support them as Top-level keys that defineĪ section in the configuration file such as build, deploy, depends_on, To reflect the structure of the Compose file itself. The topics on this reference page are organized alphabetically by top-level key '/var/run/docker.sock:/var/run/docker.sock' Image: dockersamples/examplevotingapp_worker Image: dockersamples/examplevotingapp_result:before Image: dockersamples/examplevotingapp_vote:before Here is a sample Compose file from the voting app sample used in the The latest Compose file format is defined by the Compose Specification and is implemented by Docker Compose 1.27.0+. For example, Compose file formatģ.0 was first introduced in Compose release Itself is on a release schedule, as shown in Composeĭo not necessarily increment with each release. In addition to Compose file format versions shown in the table, the Compose This table shows which Compose file versions support specific Docker releases.

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How to upgrade, see About versions and upgrading.

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For full details on what each version includes and There are several versions of the Compose file format – 1, 2, 2.x, and 3.x. These topics describe version 3 of the Compose file format. Estimated reading time: 82 minutes Reference and guidelines

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