Azure Application Gateway
An Azure service that provides a platform-managed, scalable, and highly available application delivery controller as a service.
968 questions
WebSocket connections via Application Gateway Ingress Controller reset on Horizontal Pod Scaling events
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Nabeel Shami
5
Reputation points
We have an AKS cluster where we have implemented WebSocket services. We need clients to stay connected to our services and have utilized Azure Application Gateway Ingress Controller for load balancing needs. However, we have observed that any (horizontal pod) scaling operation (scale-in and scale-out) results in all current WebSocket connections being dropped off. Our understanding is that any change in the back-end pool results in this behaviour. (There is a GitHub issue referring to the same problem). We expect many active clients (which is expected to increase to many 100k connection), and while the scaling capabilities of Azure Application Gateway fill our needs, this issue which is undocumented, creates a problem when guaranteeing high availability.
- Is there any plan to address this issue within Azure Application Gateway?
- We have considered using Azure Load Balancer instances instead. Would a change in the backend pool for the Load Balancer not impact current connections? And what is the scaling limit or capacity for Azure Load Balancer when connected to an AKS cluster?
- Is there any other architecture that we should be considering?
Azure Application Gateway
Azure Kubernetes Service (AKS)
Azure Kubernetes Service (AKS)
An Azure service that provides serverless Kubernetes, an integrated continuous integration and continuous delivery experience, and enterprise-grade security and governance.
1,883 questions
Azure FastTrack
Azure FastTrack
Azure: A cloud computing platform and infrastructure for building, deploying and managing applications and services through a worldwide network of Microsoft-managed datacenters.FastTrack: This tag is no longer in use. Please use 'Azure Startups' instead.
74 questions
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Anveshreddy Nimmala 2,700 Reputation points Microsoft Vendor2024-02-20T03:15:22.4733333+00:00 Hello Nabeel Shami, Welcome to microsoft Q&A, Thankyou for posting your query here. Based on the provided document, Application Gateway provides native support for the WebSocket protocol. However, there is no user-configurable setting to selectively enable or disable WebSocket support. Also, there is no mention of the issue you are facing with the WebSocket connections being dropped off during scaling operations. https://learn.microsoft.com/en-us/azure/application-gateway/application-gateway-websocket Support team will be able to help on this. I would recommend you to open a azure support case. If you don't have a support plan enabled on your subscription, I request you to send an email to AzCommunity@Microsoft.com with Subject as "Attn:Priyanka" referencing this thread along with your subscription ID. She can then enable your subscription with a one-time free technical support. Once the issue is resolved, request you to post the resolution here for the benefit of community.
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Anveshreddy Nimmala 2,700 Reputation points Microsoft Vendor
2024-02-22T03:24:03.3+00:00 Hello Nabeel Shami, If. an answer has been helpful, please consider accepting the answer to help increase visibility of this question for other members of the Microsoft Q&A community. If not, please let us know what is still needed in the comments so the question can be answered. Thank you for helping to improve Microsoft Q&A!
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Anveshreddy Nimmala 2,700 Reputation points Microsoft Vendor
2024-02-23T04:35:23.45+00:00 Hello Nabeel Shami, If. an answer has been helpful, please consider accepting the answer to help increase visibility of this question for other members of the Microsoft Q&A community. If not, please let us know what is still needed in the comments so the question can be answered. Thank you for helping to improve Microsoft Q&A!
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