impaired / delayed connectivity of Cluster-IPs from k8s master node

Here is what I did to make it work:

1.Set - --enable-aggregator-routing=true flag in kube API Server.

2.Set below flags in metrics-server-deployment.yaml

- --kubelet-insecure-tls- --kubelet-preferred-address-types=InternalIP

3.Set hostNetwork: truein metrics-server-deployment.yaml

api kubernetes timeout metrics flannel

This issue is related to weird flannel bug(s) with vxlan backend which causes NAT rules and/or routing entries to be missing or incomplete:

As a workaround, setting up a static route (to the service network via cni0 interface) on my nodes helped me instantly:

ip route add 10.96.0.0/12 dev cni0

CodeHunter