To setup kubectl on a master node:

1. Create the .kube subdirectory in your home directory:

   $ mkdir -p $HOME/.kube

2. Create a copy of the Kubernetes admin.conf file in the .kube directory:

   $ sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config

3. Change the ownership of the file to match your regular user profile:

   $ sudo chown $(id -u):$(id -g) $HOME/.kube/config

4. Export the path to the file for the KUBECONFIG environment variable:

   $ export KUBECONFIG=$HOME/.kube/config

   To permanently set this environment variable, add it to your .bashrc file.

   $ echo 'export KUBECONFIG=$HOME/.kube/config' >> $HOME/.bashrc

5. Verify that you can use the kubectl command.

   Kubernetes runs many of its services to manage the cluster configuration as containers running as Kubernetes pods, which can be viewed by running the following command on a master node:

   $ kubectl get pods -n kube-system
   NAME                                    READY   STATUS    RESTARTS   AGE
   coredns-5bc65d7f4b-qzfcc                1/1     Running   0          23h
   coredns-5bc65d7f4b-z64f2                1/1     Running   0          23h
   etcd-master1.example.com                1/1     Running   0          23h
   kube-apiserver-master1.example.com      1/1     Running   0          23h
   kube-controller-master1.example.com     1/1     Running   0          23h
   kube-flannel-ds-2sjbx                   1/1     Running   0          23h
   kube-flannel-ds-njg9r                   1/1     Running   0          23h
   kube-proxy-m2rt2                        1/1     Running   0          23h
   kube-proxy-tbkxd                        1/1     Running   0          23h
   kube-scheduler-master1.example.com      1/1     Running   0          23h
   kubernetes-dashboard-7646bf6898-d6x2m   1/1     Running   0          23h