kubeadm init --config=init-config.yaml
 [preflight] Running pre-flight checks.
  [WARNING FileExisting-crictl]: crictl not found in system path
[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
    [ERROR Swap]: running with swap on is not supported. Please disable swap
[preflight] If you know what you are doing, you can make a check non-fatal with `--ignore-preflight-errors=...`

处理方法：

[ERROR FileContent–proc-sys-net-bridge-bridge-nf-call-iptables]: /proc/sys/net/bridge/bridge-nf-call-iptables contents are not set to 1

 echo "1" >/proc/sys/net/bridge/bridge-nf-call-iptables

modprobe br_netfilter

[ERROR Swap]: running with swap on is not supported. Please disable swap [preflight] If you know what you are doing, you can make a check non-fatal with --ignore-preflight-errors=...

 swapoff -a
 vim /etc/fstab 
 #/dev/mapper/rhel-swap   swap                    swap    defaults        0 0