配置master节点

#!/bin/bash

# user could update hostname
export hostname=master-node

# k8s version used
export kube_version=1.17.0-00

# install curl
sudo apt-get update
sudo apt-get install -y curl

# add kubenetes repository
curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | sudo apt-key add
sudo apt-add-repository "deb http://apt.kubernetes.io/ kubernetes-xenial main"

# install docker
if ! [ -x "$(command -v docker)" ]; then
  echo "Docker installing ..."
  curl -sSL https://get.docker.com/ | sh
else
  echo "docker has already been installed"
fi

# set user into docker group, need logout to take effect
#sudo usermod -aG docker tas

# install kubeadm kubelet kubectl
sudo apt-get install -y kubelet=$kube_version  kubeadm=$kube_version kubectl=$kube_version

#turn off swap
sudo swapoff -a

# set hostname and add line to hosts file
sudo hostnamectl set-hostname $hostname
sudo sed -i "1i127.0.1.1       ${hostname}" /etc/hosts

# For master-node
sudo kubeadm init --pod-network-cidr=10.244.0.0/16

mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config

#Deploy Pod Network to Cluster
sudo kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml

执行上面的脚本，从返回消息中找到如下信息，将在配置worker节点的脚本中使用:

Then you can join any number of worker nodes by running the following on each as root:

kubeadm join 10.97.170.98:6443 --token fwhlz2.r0en0tkopmsjinit \
    --discovery-token-ca-cert-hash sha256:9844a8db82627a49838966d025d2d6b88f1ad7baabafe69d4f98d9979653a155

配置worker节点

自定义第四行hostname，如worker1， worker2
修改最后一行，用上一步中的返回信息替换，然后执行脚本

#!/bin/bash

# user could update hostname
export hostname=worker-node1

# k8s version used
export kube_version=1.17.0-00

# install curl
sudo apt-get update
sudo apt-get install -y curl

# add kubenetes repository
curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | sudo apt-key add
sudo apt-add-repository "deb http://apt.kubernetes.io/ kubernetes-xenial main"

# install docker
if ! [ -x "$(command -v docker)" ]; then
  echo "Docker installing ..."
  curl -sSL https://get.docker.com/ | sh
else
  echo "docker has already been installed"
fi


# set user into docker group, need logout to take effect
#sudo usermod -aG docker tas

# install kubeadm kubelet kubectl
sudo apt-get install -y kubelet=$kube_version  kubeadm=$kube_version kubectl=$kube_version

#turn off swap
sudo swapoff -a

# set hostname and add line to hosts file
sudo hostnamectl set-hostname $hostname
sudo sed -i "1i127.0.1.1       ${hostname}" /etc/hosts

# copy the output from master node kubeadm init
sudo kubeadm join 10.97.170.70:6443 --token icorqs.u4gbnyz7p11vkqz3 --discovery-token-ca-cert-hash sha256:cbbb51f01046558f6c7f2d6b5dee63a05fb14c35aae9cd9766191f10644abbf5

卸载环境

#!/bin/bash

echo "reset kubeadm"
sudo kubeadm reset

while true; do
    echo "Do you want to uninstall kubernetes software?"
    read -p "(y/n) " yn
    case $yn in
        [Yy]* ) uninstall_kube=yes; break;;
        [Nn]* ) break;;
        * ) echo "Please answer yes or no.";;
    esac
done

if [ "$uninstall_kube" = "yes" ]; then
    echo "##########################################################################"
    echo "uninstall k8s components"
    echo "##########################################################################"
    sudo apt-get purge kubeadm kubectl kubelet kubernetes-cni kube*
    sudo apt-get autoremove
    sudo rm -rf ~/.kube
fi

while true; do
    echo "Do you want to uninstall docker?"
    read -p "(y/n) " yn
    case $yn in
        [Yy]* ) uninstall_docker=yes; break;;
        [Nn]* ) break;;
        * ) echo "Please answer yes or no.";;
    esac
done

if [ "$uninstall_docker" = "yes" ]; then
    echo "##########################################################################"
    echo "uninstall k8s components"
    echo "##########################################################################"
    sudo apt-get purge -y docker-engine docker docker.io docker-ce
    sudo apt-get autoremove -y --purge docker-engine docker docker.io docker-ce
    sudo rm -rf /var/lib/docker /etc/docker
    sudo groupdel docker
    sudo rm -rf /var/run/docker.sock
fi