How to set ASP.NET configuration keys with dots using environment variables on Linux

Question

In .NET you sometimes need configuration keys with dots. For example in logging configuration. .NET itself creates a sample like this (Microsoft.AspNetCore):

"Logging": {
  "LogLevel": {
    "Default": "Information",
    "Microsoft.AspNetCore": "Warning"
  }
}

Is there a way to set this value with an environment variable?

I tried:

Logging__LogLevel__Microsoft.AspNetCore
Logging__LogLevel__MicrosoftAspNetCore
Logging__LogLevel__Microsoft_AspNetCore
Logging__LogLevel__Microsoft__AspNetCore

Nothing worked. I know that dots in environment variables are not allowed in Linux. But here Microsoft (.NET) dictates it.

asynts · Accepted Answer · 2025-09-27 19:04:51Z

0

This is an unresolved issue in ASP.NET which was first reported in 2019:

There is a workaround which allows '___' (triple underscore) to be used instead of '.' (link)

answered Sep 27 at 19:04

asynts

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