[root@k8s-master01 ~]# kubeadm init --config /root/new.yaml --upload-certs
[init] Using Kubernetes version: v1.20.15
[preflight] Running pre-flight checks
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
You have new mail in /var/spool/mail/root
解决办法：echo 1 >> /proc/sys/net/bridge/bridge-nf-call-iptables
标签：初始化,01,bridge,--,nf,preflight,call,net,K8S From： https://www.cnblogs.com/xgg123/p/16929532.html