WARN[0000] The "Dir_Conf_n5105" variable is not set. Defaulting to a blank string

[rimelek (Ákos Takács)]

The documentation explains how you cans et variables and which parameter in the compsoe file is for what.

Set environment variables

env_file and environment are alternatives for the same thing. To set a variable in a container, not to use in the compose file. That would require interpreting the yaml, reading the referred file and interpreting the yaml again

You need either the default .env file or overriding it from the command line with docker compose --env-file And here is one of my comments with a short example

Env file flag not working

Since your compose file has no varable reference at all, it is not surprising that the .env.dev is not used. Again, the .env file or anything you set as a parameter of docker compose to override the default is only for using variables in the compose file. Not in containers. You have to refer those variables in your compose file. There are examples in the documentation I linked to demonstrate it. It is in fact the first thing on the page I linked in my previous post. If you PHP app read any of t…