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Azure App Service supports both Windows and Linux. The supported OS depends on your apps runtime of choice. If a given runtime is no longer supported on an OS, you may need to migrate your application to a supported OS.
If you received a notification that you need to migrate your Python on Windows apps to Linux, consider the following topics when migrating.
Code dependencies and compatibility
Ensure that any dependencies or components that your application uses are also available on Linux. If Windows specific dependencies are not available on Linux, you may have to find an equivalent Linux option.
Deployment tools
If you use continuous deployment tools like GitHub Actions or Azure Pipelines, you need to make sure the build agent is using the correct operating system. For Windows to Linux, the build agent should be changed from using Windows to Ubuntu.
App Service features
While most App Service features will have parity between Windows and Linux, some Windows specific features like the Console are replaced with SSH tools on Linux.
Domain name
Deploying a new Linux application requires a new name for your app. Keep in mind any connected custom domains need to be updated to route to the new name as well.
Networking
When redeploying your application to Linux, your inbound IP address changes. See the documentation for more information on inbound IP addresses.
Managed Identity
If you managed identity is configured with your applications, be sure to update your granted permissions to use the deployed Linux application.