K8s cluster setup error: error: kubectl get CSR no resources found

Problem cause and solution test successful

problem

kubectl get csr
No resources found.

reason

because the original SSL certificate is invalid after restart, if it is not deleted, kubelet cannot communicate with the master even after restart 

Solution:

cd /opt/kubernetes/ssl
ls
kubelet-client-2021-04-14-08-41-36.pem  kubelet-client-current.pem  kubelet.crt  kubelet.key
# Delete all certificates 
rm -rf *
# close or open the kubelet
systemctl stop kubelet

master01

kubectl delete clusterrolebinding kubelet-bootstrap
clusterrolebinding.rbac.authorization.k8s.io "kubelet-bootstrap" deleted

kubectl create clusterrolebinding kubelet-bootstrap --clusterrole=system:node-bootstrapper --user=kubelet-bootstrap
clusterrolebinding.rbac.authorization.k8s.io/kubelet-bootstrap created

node 

#open kubelet
#node01
bash kubelet.sh 192.168.238.82
#node02
bash kubelet.sh 192.168.238.83

Test successful

master01

kubectl get csr
NAME                                                   AGE   REQUESTOR           CONDITION
node-csr-mJwuqA7DAf4UmB1InN_WEYhFWbQKOqUVXg9Bvc7Intk   4s    kubelet-bootstrap   Pending
node-csr-ydhzi9EG9M_Ozmbvep0ledwhTCanppStZoq7vuooTq8   11s   kubelet-bootstrap   Pending

Done!!!