Here is the log I got when run "kubeadm join ..." command,
Failed to request cluster info, will try again: [Get 10.8.0.1:6443/api/v1/namespaces/ku... dial tcp 10.8.0.1:6443: i/o timeout]
but I'm still able to ping 10.8.0.1 from the worker node
Can you access that URL in your browser on either the worker or the control plane node?
yes, I'm able to get response when execute the curl command to that URL on master node
Do we need to tell kubeadm to use "tun0" network interface instead of default one?
It sounds like you have a firewall blocking that port then
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Here is the log I got when run "kubeadm join ..." command,
Failed to request cluster info, will try again: [Get 10.8.0.1:6443/api/v1/namespaces/ku... dial tcp 10.8.0.1:6443: i/o timeout]
but I'm still able to ping 10.8.0.1 from the worker node
Can you access that URL in your browser on either the worker or the control plane node?
yes, I'm able to get response when execute the curl command to that URL on master node
Do we need to tell kubeadm to use "tun0" network interface instead of default one?
It sounds like you have a firewall blocking that port then