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Lab Solution

The appsettings.json file has this setting:

{
  "App": {
    "Environment": "DEV"
  }
}

You access that in code using the key App:Environment. You can use that as the name of an environment variable too, but not all platforms like having a colon in the name so you can also use App__Environment.

You'll see that in the Dockerfile, and this is how you override the setting in the image for one container:

docker run -d -p 8084:80 -e App__Environment=PROD simple-web

You need to use a different port, because only one container can listen on each port

Browse to http://localhost:8084/ and you'll see the updated value.