SSH into the node:
ssh clustet2-worker1
Get certificate location
cat /etc/kubernetes/kubelet.conf | grep -i client-certificate
Use the commands below:
openssl x509 --noout --text -in /var/lib/kubelet/pki/kubelet-client-current.pem | grep -i "Issuer"
openssl x509 --noout --text -in /var/lib/kubelet/pki/kubelet-client-current.pem | grep -i "Extended Key Usage" -A 10
openssl x509 --noout --text -in /var/lib/kubelet/pki/kubelet.crt | grep -i "Issuer"
openssl x509 --noout --text -in /var/lib/kubelet/pki/kubelet.crt | grep -i "Extended Key Usage" -A 10