使用Kubeadm搭建Kubernetes(1.13.1)集群 中已经详细介绍了Kubernetes集群的搭建过程，我把相关的命令简单整合了一下，写成了两个脚本，分别用来部署Master和Worker Node，用起来非常方便。

k8smaster_setup.sh

操作命令

sh k8smaster_setup.sh {master机器IP}

脚本内容：

IP=$1

# 重置kubeadm
echo "----------------重置系统环境--------------------"
sudo kubeadm reset

# 重置iptables
iptables -F && iptables -t nat -F && iptables -t mangle -F && iptables -X
sudo sysctl net.bridge.bridge-nf-call-iptables=1

# 重置网卡信息
sudo ip link del cni0
sudo ip link del flannel.1

# 关闭防火墙
sudo systemctl stop firewalld
sudo systemctl disable firewalld

# 禁用SELINUX
setenforce 0

# vim /etc/selinux/config
sudo sed -i "s/SELINUX=.*/SELINUX=disable/g" /etc/selinux/config

# 关闭系统的Swap方法如下:
# 编辑`/etc/fstab`文件，注释掉引用`swap`的行，保存并重启后输入:
sudo swapoff -a #临时关闭swap
sudo sed -i 's/.*swap.*/#&/' /etc/fstab 

echo "----------------检查Docker是否安装--------------------"
sudo yum list installed | grep 'docker-ce'
if [  $? -ne 0 ];then
    echo "Docker未安装"
    echo "----------------安装 Docker--------------------"
    # 卸载docker
    sudo yum remove -y $(rpm -qa | grep docker)
    # 安装docker
    sudo yum install -y yum-utils device-mapper-persistent-data lvm2
    sudo yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
    sudo yum install -y docker-ce
    # 重启docker
    sudo systemctl enable docker
    sudo systemctl restart docker
else
    echo "Docker已安装"
fi

echo "----------------修改yum源--------------------"
# 修改为aliyun yum源
cat <<EOF > kubernetes.repo
[kubernetes]
name=Kubernetes
baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64
enabled=1
gpgcheck=1
repo_gpgcheck=1
gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
EOF

sudo mv kubernetes.repo /etc/yum.repos.d/

# 查看可用版本
# sudo yum list --showduplicates | grep 'kubeadm\|kubectl\|kubelet'
# 安装 kubeadm, kubelet 和 kubectl
echo "----------------移除kubelet kubeadm kubectl--------------------"
sudo yum remove -y kubelet kubeadm kubectl


echo "----------------删除残留配置文件--------------------"
# 删除残留配置文件
modprobe -r ipip
lsmod
sudo rm -rf ~/.kube/
sudo rm -rf /etc/kubernetes/
sudo rm -rf /etc/systemd/system/kubelet.service.d
sudo rm -rf /etc/systemd/system/kubelet.service
sudo rm -rf /usr/bin/kube*
sudo rm -rf /etc/cni
sudo rm -rf /opt/cni
sudo rm -rf /var/lib/etcd
sudo rm -rf /var/etcd

echo "----------------配置cni--------------------"
# 配置cni
sudo mkdir -p /etc/cni/net.d/

cat <<EOF > 10-flannel.conflist
{
  "name": "cbr0",
  "plugins": [
    {
      "type": "flannel",
      "delegate": {
        "hairpinMode": true,
        "isDefaultGateway": true
      }
    },
    {
      "type": "portmap",
      "capabilities": {
        "portMappings": true
      }
    }
  ]
}
EOF
sudo mv 10-flannel.conflist /etc/cni/net.d/

echo "----------------安装 cni/kubelet/kubeadm/kubectl--------------------"
# 安装 cni/kubelet/kubeadm/kubectl
sudo yum install -y kubernetes-cni-0.6.0-0.x86_64 kubelet-1.13.1 kubeadm-1.13.1 kubectl-1.13.1 --disableexcludes=kubernetes
# 重新加载 kubelet.service 配置文件
sudo systemctl daemon-reload

echo "----------------启动 kubelet--------------------"
# 启动 kubelet
sudo systemctl enable kubelet
sudo systemctl restart kubelet


echo "----------------配置 kubeadm--------------------"
# 生成配置文件
kubeadm config print init-defaults ClusterConfiguration > kubeadm.conf 

# 修改配置文件
# 修改镜像仓储地址
sed -i 's#imageRepository: .*#imageRepository: registry.cn-beijing.aliyuncs.com/imcto#g' kubeadm.conf
# 修改版本号
sed -i "s/kubernetesVersion: .*/kubernetesVersion: v1.13.1/g" kubeadm.conf
sed -i "s/advertiseAddress: .*/advertiseAddress: $IP/g" kubeadm.conf
sed -i "s/podSubnet: .*/podSubnet: \"10.244.0.0\/16\"/g" kubeadm.conf

# 拉取镜像
sudo kubeadm config images pull --config kubeadm.conf

echo "----------------初始化 kubeadm--------------------"
# 初始化master节点
sudo kubeadm init --config kubeadm.conf

echo "----------------重启 API Server--------------------"
# 修改配置文件
sudo sed -i 's/insecure-port=0/insecure-port=8080/g' /etc/kubernetes/manifests/kube-apiserver.yaml
# 重启docker镜像
sudo docker ps |grep 'kube-apiserver_kube-apiserver'|awk '{print $1}'|head -1|xargs sudo docker restart

k8swoker_setup.sh

操作命令

sh k8swoker_setup.sh

脚本内容：

# 重置kubeadm
echo "----------------重置系统环境--------------------"
sudo kubeadm reset

# 重置iptables
iptables -F && iptables -t nat -F && iptables -t mangle -F && iptables -X
sudo sysctl net.bridge.bridge-nf-call-iptables=1

# 重置网卡信息
sudo ip link del cni0
sudo ip link del flannel.1

# 关闭防火墙
sudo systemctl stop firewalld
sudo systemctl disable firewalld

# 禁用SELINUX
setenforce 0

# vim /etc/selinux/config
sudo sed -i "s/SELINUX=.*/SELINUX=disable/g" /etc/selinux/config

# 关闭系统的Swap方法如下:
# 编辑`/etc/fstab`文件，注释掉引用`swap`的行，保存并重启后输入:
sudo swapoff -a #临时关闭swap
sudo sed -i 's/.*swap.*/#&/' /etc/fstab 

echo "----------------检查Docker是否安装--------------------"
sudo yum list installed | grep 'docker-ce'
if [  $? -ne 0 ];then
    echo "Docker未安装"
    echo "----------------安装 Docker--------------------"
    # 卸载docker
    sudo yum remove -y $(rpm -qa | grep docker)
    # 安装docker
    sudo yum install -y yum-utils device-mapper-persistent-data lvm2
    sudo yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
    sudo yum install -y docker-ce
    # 重启docker
    sudo systemctl enable docker
    sudo systemctl restart docker
else
    echo "Docker已安装"
fi

echo "----------------修改yum源--------------------"
# 修改为aliyun yum源
cat <<EOF > kubernetes.repo
[kubernetes]
name=Kubernetes
baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64
enabled=1
gpgcheck=1
repo_gpgcheck=1
gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
EOF

sudo mv kubernetes.repo /etc/yum.repos.d/

# 查看可用版本
# sudo yum list --showduplicates | grep 'kubeadm\|kubectl\|kubelet'
# 安装 kubeadm, kubelet 和 kubectl
echo "----------------移除kubelet kubeadm kubectl--------------------"
sudo yum remove -y kubelet kubeadm kubectl


echo "----------------删除残留配置文件--------------------"
# 删除残留配置文件
modprobe -r ipip
lsmod
sudo rm -rf ~/.kube/
sudo rm -rf /etc/kubernetes/
sudo rm -rf /etc/systemd/system/kubelet.service.d
sudo rm -rf /etc/systemd/system/kubelet.service
sudo rm -rf /usr/bin/kube*
sudo rm -rf /etc/cni
sudo rm -rf /opt/cni
sudo rm -rf /var/lib/etcd
sudo rm -rf /var/etcd

echo "----------------配置cni--------------------"
# 配置cni
sudo mkdir -p /etc/cni/net.d/

cat <<EOF > 10-flannel.conflist
{
  "name": "cbr0",
  "plugins": [
    {
      "type": "flannel",
      "delegate": {
        "hairpinMode": true,
        "isDefaultGateway": true
      }
    },
    {
      "type": "portmap",
      "capabilities": {
        "portMappings": true
      }
    }
  ]
}
EOF
sudo mv 10-flannel.conflist /etc/cni/net.d/

echo "----------------安装 cni/kubelet/kubeadm/kubectl--------------------"
# 安装 cni/kubelet/kubeadm/kubectl
sudo yum install -y kubernetes-cni-0.6.0-0.x86_64 kubelet-1.13.1 kubeadm-1.13.1 kubectl-1.13.1 --disableexcludes=kubernetes
# 重新加载 kubelet.service 配置文件
sudo systemctl daemon-reload

echo "----------------启动 kubelet--------------------"
# 启动 kubelet
sudo systemctl enable kubelet
sudo systemctl restart kubelet

sudo sysctl net.bridge.bridge-nf-call-iptables=1

echo "----------------启用 ipv6--------------------"
# 启用 ipv6
sudo sed -i 's\ipv6.disable=1\ipv6.disable=0\g' /etc/default/grub
sudo grub2-mkconfig -o /boot/grub2/grub.cfg

echo "----------------安装完成，重启机器--------------------"
sudo reboot