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复盘盘古石k8s的时候碰到了证书过期的问题，在此记录解决方法

报错信息：192.168.91.171:6443 was refused - did you specify the right host or port?

查看证书是否过期

kubeadm alpha certs check-expiration

或

openssl x509 -in /etc/kubernetes/pki/apiserver.crt -noout -text |grep ' Not '

更新证书

master节点运行

cp -rp /etc/kubernetes /etc/kubernetes.bak
rm -rf /etc/kubernetes/pki/apiserver.key
kubeadm alpha certs renew all
mv /etc/kubernetes/*.conf /tmp/
kubeadm init phase kubeconfig all
systemctl restart kubelet
cp /etc/kubernetes/admin.conf ~/.kube/config
kubeadm token list
kubeadm token create  #csygpb.bffu793fol3hpmf5
penssl x509 -pubkey -in /etc/kubernetes/pki/ca.crt | openssl rsa -pubin -outform der 2>/dev/null | openssl dgst -sha256 -hex | sed 's/^.* //'  #e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855

node节点运行

kubeadm join 192.168.91.171:6443 --token csygpb.bffu793fol3hpmf5 --discovery-token-ca-cert-hash sha256:e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855  #用自己生成的替换
systemctl restart kubelet

至此完事！！