...
- three hosts that can talk to each other over defaults ports 2379 and 2380 (see note in 2) Create cluster with Kubeadm);
- the three hosts have been set up following the steps in the chapter Prepare the cluster nodes;
- each host should have access to the Kubernetes container image registry k8s.gcr.io (try the commands
kubeadm config images listorkubeadm config images pull).
...