Azure application gateway ingress controller path based routing not working

Question

We are using Azure Kubernetes Service to host our application where we have two pods acting as backend. And one pod acting as frontend.

Frontend and backend pods are using Nginx internally for path based routing.

So the workflow is AGIC sends request to Nginx(behind the load balancer AKS service) and these pods are behind this load balancer.

We are using path based routing to route our traffic to these pods, which work for two pods but one of the pod in backend isn't working.

Where as I can access it using load balancer IP which confirms the pod is responding to the requests.

Thanks.

Answer 1

@Susheel Bhatt , Thank you for your question.

If you are:

using path based routing to route our traffic to these pods, which work for two pods but one of the pod in backend isn't working.

Please check that the spec.rules[].http.paths[].path, that you are mentioning in the Ingress resource, is a path that your backend nginx servers are configured to handle. One thing you might definitely want to check if the wildcards (if in use) in the spec.rules[].http.paths[].path are set up correctly

Also you might want to check the Application Gateway Resource health as follows:

• Navigate to the Application Gateway resource in the Azure Portal.
• Go to the Resource Health section from the left hand menu
• Go to the resource health dashboard to check if the Application Gateway instance is healthy

You can also check out the following:

• Troubleshoot common questions or issues with Ingress Controller
• Troubleshooting bad gateway errors in Application Gateway
• Azure Application Gateway Resource Health overview
• Use Log Analytics to examine Application Gateway Web Application Firewall (WAF) Logs

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Hope this helps.

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