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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
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
`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`
defaults to the `basename` of the project directory. See also the `-p`