Kubeadm dns issue

General Discussions
1

After installing kubeadm init ,
coredns is going to CrashLoopBackOff ,

kubeadm join whenever I run , core dns is going to crash.
please suggest

Kudeadm followed steps as below
https://kubernetes.io/docs/setup/independent/install-kubeadm/

docker versoin 18.9

2

what version of kubeadm is it and why is it in a crash loop backoff? can you see what’s happening when you describe the pod and look at the events?