下载对应版本源码
vim ./staging/src/k8s.io/client-go/util/cert/cert.go
NotAfter: now.Add(duration365d * 100).UTC(),
vim ./cmd/kubeadm/app/constants/constants.go
CertificateValidity = time.Hour * 24 * 365 * 100
yum install golang
make all WHAT=cmd/kubeadm GOFLAGS=-v
cp _output/local/bin/linux/amd64/kubeadm /usr/bin/kubeadm
kubeadm alpha certs check-expiration #检查证书到期时间
kubeadm alpha certs renew all #续订证书
