#### root commands
    1  vim /etc/hosts
    2  history
    3  ip a
    4  vim /etc/hosts
    5  yum install vim git bash-completion
    6  git clone https://github.com/sandervanvugt/cka
    7  cd cka
    8  ls
    9  vim setup-docker.sh
   10  ./setup-docker.sh
   11  vim setup-kubetools.sh
   12  ./setup-kubetools.sh
   13  ls
   14  ./counter.sh 14
   15  kubeadm init
   16  vim /etc/hosts
   17  kubeadm reset
   18  kubeadm init
   19  vim /tmp/todo.txt
   20  su - student
   21  history

#### user commands
[student@control ~]$ history
    1  mkdir .kube
    2  sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
    3  sudo chown $(id -u):$(id -g) $HOME/.kube/config
    4  vim .kube/config
    5  kubectl get all
    6  kubectl get all --all-namespaces
    7  kubectl apply -f "https://cloud.weave.works/k8s/net?k8s-version=$(kubectl version | base64 | tr -d '\n')"
    8  kubectl get all --all-namespaces
    9  kubectl get pods --all-namespaces
   10  vim /tmp/todo.txt
   11  ssh root@worker1
   12  ssh root@worker2
   13  kubectl get nodes
   14  history
   15  exit
   16  history