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84 lines
3.4 KiB
Markdown
84 lines
3.4 KiB
Markdown
<!--[metadata]>
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+++
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title = "CLI Environment Variables"
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description = "CLI Environment Variables"
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keywords = ["fig, composition, compose, docker, orchestration, cli, reference"]
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[menu.main]
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parent = "smn_compose_cli"
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weight=-1
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+++
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<![end-metadata]-->
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# CLI Environment Variables
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Several environment variables are available for you to configure the Docker Compose command-line behaviour.
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Variables starting with `DOCKER_` are the same as those used to configure the
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Docker command-line client. If you're using `docker-machine`, then the `eval "$(docker-machine env my-docker-vm)"` command should set them to their correct values. (In this example, `my-docker-vm` is the name of a machine you created.)
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## COMPOSE\_PROJECT\_NAME
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Sets the project name. This value is prepended along with the service name to the container container on start up. For example, if you project name is `myapp` and it includes two services `db` and `web` then compose starts containers named `myapp_db_1` and `myapp_web_1` respectively.
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Setting this is optional. If you do not set this, the `COMPOSE_PROJECT_NAME`
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defaults to the `basename` of the project directory. See also the `-p`
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[command-line option](overview.md).
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## COMPOSE\_FILE
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Specify the path to a Compose file. If not provided, Compose looks for a file named
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`docker-compose.yml` in the current directory and then each parent directory in
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succession until a file by that name is found.
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This variable supports multiple compose files separate by a path separator (on
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Linux and OSX the path separator is `:`, on Windows it is `;`). For example:
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`COMPOSE_FILE=docker-compose.yml:docker-compose.prod.yml`
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See also the `-f` [command-line option](overview.md).
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## COMPOSE\_API\_VERSION
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The Docker API only supports requests from clients which report a specific
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version. If you receive a `client and server don't have same version error` using
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`docker-compose`, you can workaround this error by setting this environment
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variable. Set the version value to match the server version.
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Setting this variable is intended as a workaround for situations where you need
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to run temporarily with a mismatch between the client and server version. For
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example, if you can upgrade the client but need to wait to upgrade the server.
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Running with this variable set and a known mismatch does prevent some Docker
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features from working properly. The exact features that fail would depend on the
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Docker client and server versions. For this reason, running with this variable
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set is only intended as a workaround and it is not officially supported.
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If you run into problems running with this set, resolve the mismatch through
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upgrade and remove this setting to see if your problems resolve before notifying
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support.
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## DOCKER\_HOST
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Sets the URL of the `docker` daemon. As with the Docker client, defaults to `unix:///var/run/docker.sock`.
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## DOCKER\_TLS\_VERIFY
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When set to anything other than an empty string, enables TLS communication with
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the `docker` daemon.
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## DOCKER\_CERT\_PATH
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Configures the path to the `ca.pem`, `cert.pem`, and `key.pem` files used for TLS verification. Defaults to `~/.docker`.
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## COMPOSE\_HTTP\_TIMEOUT
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Configures the time (in seconds) a request to the Docker daemon is allowed to hang before Compose considers
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it failed. Defaults to 60 seconds.
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## Related Information
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- [User guide](../index.md)
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- [Installing Compose](../install.md)
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- [Compose file reference](../compose-file.md)
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