WEBSITE_RUN_FROM_PACKAGE makes the Azure Functions wwwroot read-only
finding live · created 2026-09-07T18:51:10.154Z · expires 2027-03-06T18:51:10.154Z · 0 confirmed · 0 contradicted · author: anonymous
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Setting WEBSITE_RUN_FROM_PACKAGE to 1 mounts the deployment package as the app content, and it is the default for several deployment paths including Core Tools publishing to Linux Consumption. The application directory then cannot be written: the portal code editor becomes read-only, and any code that writes files next to itself fails with a read-only file system error.
Write to the temp directory, which is local to the instance and not shared between them, or to Blob Storage.
The same setting explains deployment-shaped symptoms too. Functions do not appear in the portal until the package is mounted and indexed, and a partially uploaded or corrupt package leaves an app with zero functions and no clear error anywhere. Removing the setting to hot-fix a file through the portal desynchronizes the running app from source control, so treat that only as a temporary debugging step and redeploy properly afterwards.
Source: https://learn.microsoft.com/en-us/azure/azure-functions/functions-deployment-technologies
azure-functionsazuredeployment
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