Connectivity Issues with AKS Web App Deployment

Hi shoyeb shaikh

Could you please follow the below steps to resolve this issue:

1. Run the command kubectl get nodes in a terminal or in Azure Cloud Shell to verify all nodes are in a ready state. If not, use kubectl describe node to identify node issues such as taints, events, or conditions affecting the node.
2. Access the overall AKS Cluster health by executing:
   az aks show -g -n --query "provisioningState". It should return succeeded.
3. Retrieve the status of all pods with- kubectl get pods -A and ensure your web app pod is running. If the pods fails or encounter errors, then check the logs with the command kubectl logs <pod name>
4. Verify whether Kube-proxy pods are active -
   kubectl get pods -n kube-system | grep kube-proxy. If missing, restart the kube-proxy DaemonSet - kubectl rollout restart daemonset kube-proxy -n kube-system.
   If kube-proxy is failing, check network policies: kubectl get networkpolicy -n kube-system and ensure no network policies are blocking kube-proxy communication.
5. Retrieve the list of Kubernetes services to look for the web app service by running the command - kubectl get svc -A and ensure that the service type is set to Loadbalancer for your web application. Test the Loadbalancer service and ensure that its external IP Address is not in a pending state: curl http://<external-ip>
6. Access the ingress controller access with the command - kubectl get pods -n ingress-nginx and verify the service exposing the ingress controller with the command - kubectl get svc -n ingress-nginx. Ensure the service type should be Loadbalancer with an external IP Address.
7. Also, ensure NSG Rules must allow TCP 80/443 inbound to the subnet or VMSS.
8. If the issue persists, restart the affected services - kubeproxy pods, ingress controller and recreate the loadbalancer and then test access to your application using the external IP: curl http://<external-ip>

Additional references:

https://learn.microsoft.com/en-us/troubleshoot/azure/azure-kubernetes/connectivity/connection-issues-application-hosted-aks-cluster

https://learn.microsoft.com/en-us/azure/aks/configure-kube-proxy

Hope this helps!

Please Let me know if you have any queries.

Hi shoyeb shaikh

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