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Environment Variables¶

Reference of key app settings for .NET isolated worker apps.

flowchart TD
    A[Configuration] --> B[Build]
    B --> C[Deploy]
    C --> D[Observe]

Topic/Command Groups¶

Core Settings¶

Variable	Example	Purpose
`FUNCTIONS_WORKER_RUNTIME`	`dotnet-isolated`	Select isolated worker runtime
`FUNCTIONS_EXTENSION_VERSION`	`~4`	Pin major Functions runtime
`AzureWebJobsStorage`	`DefaultEndpointsProtocol=...`	Host storage connection
`APPLICATIONINSIGHTS_CONNECTION_STRING`	`InstrumentationKey=...`	Telemetry destination

.NET-Specific Settings¶

Variable	Example	Purpose	Notes
`DOTNET_ENVIRONMENT`	`Production`	.NET environment configuration	Maps to `IHostEnvironment.EnvironmentName`
`AZURE_FUNCTIONS_ENVIRONMENT`	`Production`	Functions-specific environment	Overrides `DOTNET_ENVIRONMENT` when both are set
`WEBSITE_RUN_FROM_PACKAGE`	`1`	Run from immutable deployment package	Recommended for production
`DOTNET_CLI_TELEMETRY_OPTOUT`	`1`	Disable .NET CLI telemetry	Useful in build/CI environments

Runtime Selection¶

`FUNCTIONS_WORKER_RUNTIME` value	Model	Notes
`dotnet-isolated`	Isolated worker (recommended)	Runs in a separate .NET process; supports .NET 8+
`dotnet`	In-process (legacy)	Shares process with Functions host; .NET 6 only, reaching end of support

Local settings example¶

{
  "IsEncrypted": false,
  "Values": {
    "FUNCTIONS_WORKER_RUNTIME": "dotnet-isolated",
    "FUNCTIONS_EXTENSION_VERSION": "~4",
    "AzureWebJobsStorage": "UseDevelopmentStorage=true"
  }
}

See Also¶

Sources¶