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8 changes: 8 additions & 0 deletions articles/app-service/configure-custom-container.md
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Expand Up @@ -178,6 +178,14 @@ Set-AzWebApp -ResourceGroupName <group-name> -Name <app-name> -AppSettings @{"DB

When your app runs, the App Service app settings are injected into the process as environment variables automatically. You can verify container environment variables with the URL `https://<app-name>.scm.azurewebsites.net/Env`.

By default with Custom Docker Images, when SSH’ing into a container, only a few certain environment variables may be seen when trying to use something like env or printenv. To be able to see all environment variables within the container - such as ones you pass in to your application for runtime usage, add this line to your entrypoint script:

```docker endpoint
eval $(printenv | sed -n "s/^\([^=]\+\)=\(.*\)$/export \1=\2/p" | sed 's/"/\\\"/g' | sed '/=/s//="/' | sed 's/$/"/' >> /etc/profile)
```

A full example can be seen [here](https://github.com/azureossd/docker-container-ssh-examples/blob/main/alpine-node/init_container.sh).

If your app uses images from a private registry or from Docker Hub, credentials for accessing the repository are saved in environment variables: `DOCKER_REGISTRY_SERVER_URL`, `DOCKER_REGISTRY_SERVER_USERNAME`, and `DOCKER_REGISTRY_SERVER_PASSWORD`. Because of security risks, none of these reserved variable names are exposed to the application.

::: zone pivot="container-windows"
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