set master node
user@miguelmota1:~$ sudo kubeadm init --pod-network-cidr=10.244.0.0/16
[sudo] password for user:
^B^[kk[init] using Kubernetes version: v1.11.2
[preflight] running pre-flight checks
I0901 00:44:36.182370 16584 kernel_validator.go:81] Validating kernel version