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Update envvars.md 

Replace underscores with hyphens in container names.
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Marco Marra 2022-03-29 09:41:08 +02:00 committed by GitHub
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compose/reference/envvars.md
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@ -17,7 +17,7 @@ Docker command-line client. If you're using `docker-machine`, then the `eval "$(
Sets the project name. This value is prepended along with the service name to Sets the project name. This value is prepended along with the service name to
the container on start up. For example, if your project name is `myapp` and it the container on start up. For example, if your project name is `myapp` and it
includes two services `db` and `web`, then Compose starts containers named includes two services `db` and `web`, then Compose starts containers named
`myapp_db_1` and `myapp_web_1` respectively. `myapp-db-1` and `myapp-web-1` respectively.
Setting this is optional. If you do not set this, the `COMPOSE_PROJECT_NAME` Setting this is optional. If you do not set this, the `COMPOSE_PROJECT_NAME`
defaults to the `basename` of the project directory. See also the `-p` defaults to the `basename` of the project directory. See also the `-p`