WEBSITE_MOUNT_PATH_xxx environment variable

Question

Hello,

Since a couple of weeks ago, a new environment variable is added by Azure which is crashing the web application.

I'm using a docker container image for a Linux web application within an App Service.

The new environment variable is named WEBSITE_MOUNT_PATH_xxx where xxx is the name of the app.

The issue is that this environment variable is malformed. There is no = sign like other variables and Its not a key=value syntax. There is only the key, as a consequence this variable is unreadable and application crashes.

Finally, I do not find any information about this variable on Azure docs (https://learn.microsoft.com/en-us/azure/app-service/reference-app-settings). It seems its undocumented.

Is there any way to prevent this environment variable from being set ?

Answer 1

I have the same question. When I SSH into the App from the portal, this is displayed...

-ash: export: line 47: WEBSITE_MOUNT_PATH_xxx-logs: bad variable name

Where xxx-logs is the name of a Path mapping (Configuration Blade) to a storage account fielshare. Currently seeing if this is caused by source code or deployment, but worrying. Almost as if there is a union in this string space. Bad memory in the worker that deployed maybe? The website is hosted on another shared mount, 10.x.x.x. (/home) as expected.
df reveals that these are mounted as expected. My app does not crash.