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)?

No, I have decided not proceed this route as it seem to be problematic. — Sean Feldman, Oct 01 '13 at 00:32

score 23 · Accepted Answer · answered Mar 20 '14 at 21:35

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.

score 3 · Answer 2 · edited Jun 20 '20 at 09:12

3

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.

edited Jun 20 '20 at 09:12

Community

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answered Jan 25 '16 at 06:14

Oleg Burov

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score 1 · Answer 3 · answered Oct 18 '13 at 16:39

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You can use Server.MachineName to get the name of the server.

answered Oct 18 '13 at 16:39

Ken Vleminckx

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score 1 · Answer 4 · answered Jun 06 '22 at 05:13

1

2022-06-06

Configuration of Web App

How to find Instance

1.This is an instance ID.

2.Go to see the environment

3.Find which variable is pl1sdlwk0001WS, and COMPUTERNAME is that you want.

answered Jun 06 '22 at 05:13

Jess Chen

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score 0 · Answer 5 · answered Feb 28 '14 at 05:22

0

Set up InstanceInputEndpoint in configuration. This will allocate ports from the given port range for each instance, then you can visit a instance through the port.

For more information about InstanceInputEndpoint: http://msdn.microsoft.com/en-us/library/windowsazure/gg557553.aspx

answered Feb 28 '14 at 05:22

sqybi

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this is for Azure Web Roles, not Azure Websites (now named Azure Web Apps) – Jonathan McIntire Dec 10 '15 at 21:17

Larry Smith · Answer 6 · 2023-07-07T15:56:35.043

New answer to an old question. I found this worked with .net 6, Azure Function v4, and worked well with hosting on a multi-instance App Server Plan. The value it returns matches the "Server Name" as listed in Application Insights.

        var instanceName = Environment.GetEnvironmentVariable("WEBSITE_INSTANCE_ID");

I then injected this into my logging

            Logger log = new LoggerConfiguration()
            .Enrich.WithProperty("InstanceName", instanceName)
            .MinimumLevel.Debug()
            .WriteTo.AzureBlobStorage(

and accessed it by setting it up in my Serilogger output template:

        "Logging:OutputTemplate": "[{Timestamp:yyyy-MM-dd HH:mm:ss}][{InstanceName}][{Level:u3}] {Message:lj}{NewLine}{Exception}"

Note: this resolves to null when debugging locally.

score -2 · Answer 7 · answered Aug 07 '13 at 06:52

-2

You can use RoleEnvironment.CurrentRoleInstance.Id

answered Aug 07 '13 at 06:52

bhavesh lad

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This doesn't work on Azure Websites, perhaps because this is for WebRoles? – Sean Feldman Aug 07 '13 at 19:47

score -3 · Answer 8 · answered Aug 08 '13 at 04:06

-3

Request.ServerName I believe. Just like vanilla IIS

answered Aug 08 '13 at 04:06

Nir Mashkowski

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That doesn't work. When you have multiple instances (dedicated mode) the server name returned is the same for all instances ([website-name].azurewebsites.net) – Sean Feldman Aug 08 '13 at 14:25
`Request.ServerName` isn't a valid property. I assume you meant `Request.ServerVariables[“SERVER_NAME”]`? – Sean Kearney Aug 08 '13 at 14:28

Windows Azure Websites - Get Instance Identifier

8 Answers8

Configuration of Web App

How to find Instance

Linked