We currently having 2 Master 2 Worker node cluster on Kubernetes v1.13.4.The cluster is down as the kubelet certificate located in /var/lib/kubelet/pki/kubelet.crt has expired and the kubelet service is not running. On checking the kubelet logs I get the following error
E0808 09:49:35.126533 55154 bootstrap.go:209] Part of the existing bootstrap client certificate is expired: 2019-08-06 22:39:23 +0000 UTC T
he following certificates ca.crt, apiserver-kubelet-client.crt are valid. We are unable to renew the kubelet.crt certificate manually by using the kubeadm-config.yaml. Can someone please provide the steps to renew the certificate.
We have tried setting --rotate-certificates property and also using kubeadm-config.yaml but since we are using v1.13.4 kubeadm --config flag is not present. On checking the kubelet logs I get the following error E0808 09:49:35.126533 55154 bootstrap.go:209] Part of the existing bootstrap client certificate is expired: 2019-08-06 22:39:23 +0000 UTC