Azure functions runtime versions

This information was not so easy to find therefore a summary in this post.

How to check Azure functions runtime version number

Sometimes the runtime version number is visible in the Azure portal. But not always (whatever the reason). For all my functions in the Flex Consumption plan the version number was not visible. But this always worked:

How to check the exact Azure function runtime version number

Specifying the exact Azure function runtime version number to use

Sometimes you need to specify the exact runtime version number that your Azure function should use (in contrast to using generic 1.x or 4.x version).

This is described here - Azure Functions runtime versions overview.

And here - functions-app-settings

Available runtime versions

Here is Azure publishing the release notes for their runtimes: https://github.com/Azure/azure-functions-host/releases