LFS 258 - Chapter 3 Discussion // Questions // Banter

Tim,

I created 2 VPC instances (Ubuntu 18.04) in GCP - one to serve as the master node and the other as the worker. I finished setting up the master by following the instructions in lab 3.1. The kubeadm command completed successfully and I'm able to see that the node is up and running.

My kubectl get nodes returned this:
NAME STATUS ROLES AGE VERSION
master Ready master 107m v1.18.1

later I set up the worker node by following the instructions in lab 3.2. However when I try to join the worker to the master node, the kubeadm join command, fails with this error:

couldn't validate the identity of the API Server: Get https://k8smaster:6443/api/v1/namespaces/kube-public/configmaps/cluster-info?timeout=10s: net/http: request canceled while waiting for connection (Client.Timeout exceeded while awaiting headers)

I checked to make sure that my token is not expired. For both instances, I have created the firewall rule to 'Allow all', Target: 'All instances in the network' and Source ip ranges: 0.0.0.0/0.

Any idea why this issue happens?

Regards
Vijay.