Windows Azure Websites - Get Instance Identifier

Question

What's a possible way to determine on an Azure website with multiple instances what instance is responding (some ID or other piece of unique info)?

Answer 1

The following environment setting will have the instance id the current request is running on: WEBSITE_INSTANCE_ID.

You'll also receive this id as a cookie in the response named: ARRAffinity.

You can also use this information to get back to that specific instance, see: http://blog.amitapple.com/post/2014/03/access-specific-instance/ for more information about it.

Answer 2

Microsoft Azure provides many environment variables for Azure Web Apps (formerly known as Website), including the following:

• WEBSITE_SITE_NAME - the name of the site.

• WEBSITE_INSTANCE_ID- the id representing the VM that the site is running on.

• etc

  See Azure Runtime Environment by David Ebbo for more details.