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# On the k8s-master vm setup the kubernetes master node.  
# The "sudo -i" changes user to root.
sudo -i

# There is no kubernetes app running. 
ps -ef | grep -i kube | grep -v grep

# Pick one DNS add-on: either "kube-dns" or "CoreDNS".  If your environment setup is for "Kubernetes federation" or "SDN-C Geographic Redundancy" then use "CoreDNS" addon.
# Note that kubeadm version 1.8.x does not have support for coredns feature gate. 
# Upgrade kubeadm to latest version before running below command:

# With "CoreDNS" addon (recommended)
kubeadm init --feature-gates=CoreDNS=true | tee ~/kubeadm_init.log 

# with kube-dns addon
kubeadm init | tee ~/kubeadm_init.log

# Verify many kubernetes app running (kubelet,  kube-scheduler, etcd, kube-apiserver, kube-proxy, kube-controller-manager)
ps -ef | grep -i kube | grep -v grepkube-controller-managergrep

# The "exit" reverts user back to ubuntu.
exit