Troubleshoot

CoreDNS debug

kubectl debug -it coredns-6f596786fd-5jthz --image=nicolaka/netshoot --target=coredns -n kube-system

Netshoot for troubleshoot

Change resolve server in codedns

Cilium need to change configmap in coredns to 1.1.1.1

Fix calico issue on EC2

Calico require port 179, if we deploy it into AWS EC2, we need to open protocol IPINIP (4) in security group

Openbao