PangYeon`s IT Log

/etc/kubernetes/kubelet.conf is expired 에러 등. 인증서 만료 후 재갱신 방법이다

k8s 인증서 갱신

kubeadm certs renew all

k8s 인증서 갱신 확인

kubeadm certs check-expiration

Kubelet 인증서 갱신

(기존거 백업하고 진행할거면 /etc/kubernetes/kubelet.conf 파일과 /var/lib/kubelet/pki/kubelet-client-current.pem 파일 백업)

kubeadm kubeconfig user --org system:nodes --client-name system:node:$NODE > kubelet.conf

기존 Kubelet 인증서 및 kubelet-client-current.pem 삭제

rm /etc/kubernetes/kubelet.conf
rm /var/lib/kubelet/pki/kubelet-client-current.pem

Kubelet 인증서 복사

cp kubelet.conf /etc/kubernetes/

Kubelet 재기동

(재기동하면 삭제한 kubelet-client-current.pem 파일이 자동 생성 됨)

systemctl restart kubelet

kubelet-client-current.pem 조회

ls /var/lib/kubelet/pki/
kubelet-client-current.pem kubelet.crt kubelet.key

kubelet.conf 수정

vi kubelet.conf
users:
- name: 'system:node:'
  user:
    client-certificate: /var/lib/kubelet/pki/kubelet-client-current.pem
    client-key: /var/lib/kubelet/pki/kubelet-client-current.pem

참고 :

https://kubernetes.io/docs/setup/production-environment/tools/kubeadm/troubleshooting-kubeadm/#kubelet-client-cert