a4f5e30249
* Reword lots of instances of 'will' * Reword lots of instances of won't * Reword lots of instances of we'll * Eradicate you'll * Eradicate 'be able to' type of phrases * Eradicate 'unable to' type of phrases * Eradicate 'has / have to' type of phrases * Eradicate 'note that' type of phrases * Eradicate 'in order to' type of phrases * Redirect to official Chef and Puppet docs * Eradicate gratuitous 'please' * Reduce use of e.g. * Reduce use of i.e. * Reduce use of N.B. * Get rid of 'sexagesimal' and correct some errors
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description, keywords, title
| description | keywords | title |
|---|---|---|
| Declare default environment variables in a file | fig, composition, compose, docker, orchestration, environment, env file | Declare default environment variables in file |
Compose supports declaring default environment variables in an environment file
named .env placed in the folder where the docker-compose command is executed
(current working directory).
Syntax rules
These syntax rules apply to the .env file:
- Compose expects each line in an
envfile to be inVAR=VALformat. - Lines beginning with
#are processed as comments and ignored. - Blank lines are ignored.
- There is no special handling of quotation marks. This means that they are part of the VAL.
Compose file and CLI variables
The environment variables you define here is used for variable substitution in your Compose file, and can also be used to define the following CLI variables:
COMPOSE_API_VERSIONCOMPOSE_CONVERT_WINDOWS_PATHSCOMPOSE_FILECOMPOSE_HTTP_TIMEOUTCOMPOSE_TLS_VERSIONCOMPOSE_PROJECT_NAMEDOCKER_CERT_PATHDOCKER_HOSTDOCKER_TLS_VERIFY
Notes
Values present in the environment at runtime always override those defined inside the
.envfile. Similarly, values passed via command-line arguments take precedence as well.Environment variables defined in the
.envfile are not automatically visible inside containers. To set container-applicable environment variables, follow the guidelines in the topic Environment variables in Compose, which describes how to pass shell environment variables through to containers, define environment variables in Compose files, and more.