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Showing content from https://docs.docker.com/reference/cli/docker/compose/ below:

docker compose | Docker Docs

Define and run multi-container applications with Docker

Use the -f flag to specify the location of a Compose configuration file.

You can supply multiple -f configuration files. When you supply multiple files, Compose combines them into a single configuration. Compose builds the configuration in the order you supply the files. Subsequent files override and add to their predecessors.

For example, consider this command line:

The compose.yaml file might specify a webapp service.

If the compose.admin.yaml also specifies this same service, any matching fields override the previous file. New values, add to the webapp service configuration.

When you use multiple Compose files, all paths in the files are relative to the first configuration file specified with -f. You can use the --project-directory option to override this base path.

Use a -f with - (dash) as the filename to read the configuration from stdin. When stdin is used all paths in the configuration are relative to the current working directory.

The -f flag is optional. If you don’t provide this flag on the command line, Compose traverses the working directory and its parent directories looking for a compose.yaml or docker-compose.yaml file.

You can use the -f flag to specify a path to a Compose file that is not located in the current directory, either from the command line or by setting up a COMPOSE_FILE environment variable in your shell or in an environment file.

For an example of using the -f option at the command line, suppose you are running the Compose Rails sample, and have a compose.yaml file in a directory called sandbox/rails. You can use a command like docker compose pull to get the postgres image for the db service from anywhere by using the -f flag as follows:

Each configuration has a project name. Compose sets the project name using the following mechanisms, in order of precedence:

• The -p command line flag
• The COMPOSE_PROJECT_NAME environment variable
• The top level name: variable from the config file (or the last name: from a series of config files specified using -f)
• The basename of the project directory containing the config file (or containing the first config file specified using -f)
• The basename of the current directory if no config file is specified Project names must contain only lowercase letters, decimal digits, dashes, and underscores, and must begin with a lowercase letter or decimal digit. If the basename of the project directory or current directory violates this constraint, you must use one of the other mechanisms.

Use --profile to specify one or more active profiles Calling docker compose --profile frontend up starts the services with the profile frontend and services without any specified profiles. You can also enable multiple profiles, e.g. with docker compose --profile frontend --profile debug up the profiles frontend and debug is enabled.

Profiles can also be set by COMPOSE_PROFILES environment variable.

Use --parallel to specify the maximum level of parallelism for concurrent engine calls. Calling docker compose --parallel 1 pull pulls the pullable images defined in the Compose file one at a time. This can also be used to control build concurrency.

Parallelism can also be set by the COMPOSE_PARALLEL_LIMIT environment variable.

You can set environment variables for various docker compose options, including the -f, -p and --profiles flags.

Setting the COMPOSE_FILE environment variable is equivalent to passing the -f flag, COMPOSE_PROJECT_NAME environment variable does the same as the -p flag, COMPOSE_PROFILES environment variable is equivalent to the --profiles flag and COMPOSE_PARALLEL_LIMIT does the same as the --parallel flag.

If flags are explicitly set on the command line, the associated environment variable is ignored.

Setting the COMPOSE_IGNORE_ORPHANS environment variable to true stops docker compose from detecting orphaned containers for the project.

Setting the COMPOSE_MENU environment variable to false disables the helper menu when running docker compose up in attached mode. Alternatively, you can also run docker compose up --menu=false to disable the helper menu.

Use --dry-run flag to test a command without changing your application stack state. Dry Run mode shows you all the steps Compose applies when executing a command, for example:

From the example above, you can see that the first step is to pull the image defined by db service, then build the backend service. Next, the containers are created. The db service is started, and the backend and proxy wait until the db service is healthy before starting.

Dry Run mode works with almost all commands. You cannot use Dry Run mode with a command that doesn't change the state of a Compose stack such as ps, ls, logs for example.

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