stderr:
	[WARNING IsDockerSystemdCheck]: detected "cgroupfs" as the Docker cgroup driver. The recommended driver is "systemd". Please follow the guide at https://kubernetes.io/docs/setup/cri/
	[WARNING Swap]: running with swap on is not supported. Please disable swap
	[WARNING FileExisting-socat]: socat not found in system path
	[WARNING Service-Kubelet]: kubelet service is not enabled, please run 'systemctl enable kubelet.service'
error execution phase preflight: [preflight] Some fatal errors occurred:
	[ERROR FileContent--proc-sys-net-bridge-bridge-nf-call-iptables]: /proc/sys/net/bridge/bridge-nf-call-iptables contents are not set to 1
[preflight] If you know what you are doing, you can make a check non-fatal with `--ignore-preflight-errors=...`
To see the stack trace of this error execute with --v=5 or higher

• detected “cgroupfs” as the Docker cgroup driver.

vim /etc/docker/daemon.json
 {
"registry-mirrors": [
"https://kfwkfulq.mirror.aliyuncs.com",
"https://2lqq34jg.mirror.aliyuncs.com",
"https://pee6w651.mirror.aliyuncs.com",
"https://registry.docker-cn.com",
"http://hub-mirror.c.163.com"
],
"dns": ["114.114.114.114","8.8.4.4"],
"exec-opts": ["native.cgroupdriver=systemd"]            ### 新增这行
}

systemctl restart docker

docker info | grep Cgroup
Cgroup Driver: systemd

• running with swap on is not supported. Please disable swap

# 关掉swapoff
swapoff -a
# 注释最后一行
vi /etc/fstab

#
# /etc/fstab
# Created by anaconda on Thu Nov 14 14:43:07 2019
#
# Accessible filesystems, by reference, are maintained under '/dev/disk'
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
#
/dev/mapper/centos-root /                       xfs     defaults        0 0
UUID=ebdb0874-2f24-4448-b72a-74af285c9988 /boot                   xfs     defaults        0 0
<将改行注释> /dev/mapper/centos-swap swap                    swap    defaults        0 0

#重起
reboot now

• socat not found in system path

# 安装socat conntrack-tools
yum -y install socat conntrack-tools

• kubelet service is not enabled

 # 设置开机启动
systemctl enable kubelet.service

• To pull new external images, you may need to configure a proxy:
  https://minikube.sigs.k8s.io/docs/reference/networking/proxy/卡死

minikube start --registry-mirror=https://registry.docker-cn.com --kubernetes-version v1.21.3