三台KVM，分别是node0、node1、node2，使用ubuntu 20.10系统

node0是master，node1和node2是worker

以下是三台虚拟机上都有安装的组件

• 禁止系统休眠

systemctl mask sleep.target suspend.target hibernate.target hybrid-sleep.target

• 禁止swap

swapoff -a

vi /etc/fstab，将swap那行注释掉

• 安装docker

apt install docker

然后修改driver为systemd

 cat > /etc/docker/daemon.json
{
  "registry-mirrors": [
    "https://docker.mirrors.ustc.edu.cn",
    "http://hub-mirror.c.163.com"
  ],
  "insecure-registries":[
    "http://registry.my-lnk.tech"
  ],
  "max-concurrent-downloads": 10,
  "exec-opts": ["native.cgroupdriver=systemd"],
  "log-driver": "json-file",
  "log-level": "warn",
  "log-opts": {
    "max-size": "10m",
    "max-file": "3"
    },
  "data-root": "/var/lib/docker",
  "storage-driver": "overlay2"
}

• 安装kubelet kubeadm kubectl

apt update && apt install -y apt-transport-https

curl https://mirrors.aliyun.com/kubernetes/apt/doc/apt-key.gpg | apt-key add -

cat <<EOF >/etc/apt/sources.list.d/kubernetes.list
deb https://mirrors.aliyun.com/kubernetes/apt/ kubernetes-xenial main
EOF

apt update

# 查看可安装版本
apt-cache madison kubelet

# 安装版本

apt install -y kubelet kubeadm kubectl

# 配置自启动
sudo systemctl enable kubelet && sudo systemctl start kubelet

以下是在MASTER上执行的命令，本次安装以1.20.2版本

export MASTER_IP=192.168.122.100    #MASTER主机的IP
export APISERVER_NAME=my.k8s.demo     #域名
export POD_SUBNET=10.100.0.1/16      #子网，可以不改
echo "${MASTER_IP} ${APISERVER_NAME}" >> /etc/hosts
curl -sSL https://kuboard.cn/install-script/v1.20.x/init_master.sh | sh -s 1.20.2

安装完成后，如果全部成功，执行如下命令生成JOIN码：

kubeadm token create --print-join-command
kubeadm join my.k8s.demo:6443 --token ollefx.h2sylxwwb04m6a0n --discovery-token-ca-cert-hash sha256:b941724b5f1a7970ee6929c9c8dc0130029b23ba5cc03ae2f825597363882fe8

以下是在两台worker上分别都执行：

export MASTER_IP=192.168.122.100
export APISERVER_NAME=my.k8s.demo
echo "${MASTER_IP} ${APISERVER_NAME}" >> /etc/hosts
kubeadm join my.k8s.demo:6443 --token ollefx.h2sylxwwb04m6a0n --discovery-token-ca-cert-hash sha256:b941724b5f1a7970ee6929c9c8dc0130029b23ba5cc03ae2f825597363882fe8

等待所有镜像下载完毕，如果成功后在MASTER上执行打印如下：

root@k8s-master:/mnt/share# kubectl get nodes
NAME         STATUS   ROLES                  AGE   VERSION
k8s-master   Ready    control-plane,master   76m   v1.20.2
k8s-node1    Ready    <none>                 34m   v1.20.2
k8s-node2    Ready    <none>                 33m   v1.20.2

定位问题：
查看启动日志：
journalctl -u kubelet -n 1000