If while setting up KEDA, you get an error: (v1beta1.external.metrics.k8s.io) status FailedDiscoveryCheck with a message: failing or missing response from https://POD-IP:6443/apis/external.metrics.k8s.io/v1beta1: Get "https://POD-IP:6443/apis/external.metrics.k8s.io/v1beta1": Address is not allowed.

One of the reason for this can be due to CNI like Cilium or any other.

Before you start

• Make sure no network policies are blocking traffic and required CIDR’s are added

Check the status:

Find the api service name for the service keda/keda-metrics-apiserver:

kubectl get apiservice --all-namespaces

Check for the status of the api service found in previous step:

kubectl get apiservice <apiservicename> -o yaml

Example:

kubectl get apiservice v1beta1.external.metrics.k8s.io -o yaml

If the status is False, then there seems to be an issue and network might be the primary reason for it.

Solution for managed Kubernetes services:

In managed Kubernetes services you might solve the issue by updating deployment file of metric-apiserver as below.

    dnsPolicy: ClusterFirst
    hostNetwork: true

Eg: Modify useHostNetwork in values file.