kubeadm 报错 error execution phase preflight: couldn’t validate the identity of the API Server: abort connecting to API servers after timeout of 5m0s

原因：master节点的token过期了

解决：重新生成新token

在master重新生成token

# kubeadm token create
424mp7.nkxx07p940mkl2nd
# openssl x509 -pubkey -in /etc/kubernetes/pki/ca.crt | openssl rsa -pubin -outform der 2>/dev/null | openssl dgst -sha256 -hex | sed 's/^.* //'
d88fb55cb1bd659023b11e61052b39bbfe99842b0636574a16c76df186fd5e0d

Node节点重新join就可以了

kubeadm join 192.168.169.21:6443 –token 424mp7.nkxx07p940mkl2nd \
--discovery-token-ca-cert-hash sha256:d88fb55cb1bd659023b11e61052b39bbfe99842b0636574a16c76df186fd5e0d