CODEWITHSUNDEEP
azureazure-web-app-service
ChrisBellew
ChrisBellew

Reputation: 1174

How do I get a memory dump for a specific Azure Web App instance?

I have an Azure Web App running under an App Service Plan which is set to scale out.

I apply load and it scales to multiple instances, but one of those instances has entered a deadlock situation and stops responding.

I want to be about to take a full memory dump of the specific instance that has deadlocked.

I am able to take a full dump of the web app process via .scm.azurewebsites.net/ProcessExplorer/ but the process I am seeing here has almost no threads so it is clear to me that I am not looking at the process that is deadlocked.

Can I get a memory dump from a specific web app instance under a plan?

Thanks in advance to everyone, Chris

Upvotes: 1

Views: 2128

Answers (2)

Miroslav Holec
Miroslav Holec

Reputation: 3217

  1. Visit Azure Portal
  2. Choose your Azure Web App
  3. Choose Diagnostics as a Service in the Azure Web App menu
  4. Check Memory Dump and check all the instance names
  5. Click on the Run button and wait for generating

Memory Dumps

Upvotes: 2

David Ebbo
David Ebbo

Reputation: 43193

You can get the list of instance IDs using https://resources.azure.com/. Find your Web App, and go under Instances.

Once you know the Instance ID, you can set the ARRAffinity cookie to it when you go to the scm site, and you will hit the instance of your choice (e.g. I use this Chrome Extension). If you're not sure which one it is, you may need to try them all.

Related info in this post.

Upvotes: 3

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