> for item in `find /etc/kubernetes/pki -maxdepth 2 -name "*.crt"`;do openssl x509 -in $item -text -noout| grep Not;echo ======================$item===============;done
Not Before: Dec 27 07:18:44 2019 GMT Not After : Dec 24 07:18:44 2029 GMT ======================/etc/kubernetes/pki/ca.crt=============== Not Before: Dec 27 07:18:44 2019 GMT Not After : Dec 22 23:43:16 2021 GMT ======================/etc/kubernetes/pki/apiserver.crt=============== Not Before: Dec 27 07:18:44 2019 GMT Not After : Dec 22 23:43:17 2021 GMT ======================/etc/kubernetes/pki/apiserver-kubelet-client.crt=============== Not Before: Dec 27 07:18:45 2019 GMT Not After : Dec 24 07:18:45 2029 GMT ======================/etc/kubernetes/pki/front-proxy-ca.crt=============== Not Before: Dec 27 07:18:45 2019 GMT Not After : Dec 22 23:43:17 2021 GMT ======================/etc/kubernetes/pki/front-proxy-client.crt=============== Not Before: Dec 27 07:18:45 2019 GMT Not After : Dec 24 07:18:45 2029 GMT ======================/etc/kubernetes/pki/etcd/ca.crt=============== Not Before: Dec 27 07:18:45 2019 GMT Not After : Dec 22 23:42:44 2021 GMT ======================/etc/kubernetes/pki/etcd/server.crt=============== Not Before: Dec 27 07:18:45 2019 GMT Not After : Dec 22 23:42:44 2021 GMT ======================/etc/kubernetes/pki/etcd/peer.crt=============== Not Before: Dec 27 07:18:45 2019 GMT Not After : Dec 22 23:42:45 2021 GMT ======================/etc/kubernetes/pki/etcd/healthcheck-client.crt=============== Not Before: Dec 27 07:18:45 2019 GMT Not After : Dec 22 23:43:17 2021 GMT ======================/etc/kubernetes/pki/apiserver-etcd-client.crt===============
查看后发现的确到期，那么我们renew证书即可：
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
> kubeadm alpha certs renew all Command "all" is deprecated, please use the same command under "kubeadm certs" [renew] Reading configuration from the cluster... [renew] FYI: You can look at this config file with 'kubectl -n kube-system get cm kubeadm-config -o yaml'
certificate embedded in the kubeconfig file for the admin to use and for kubeadm itself renewed certificate for serving the Kubernetes API renewed certificate the apiserver uses to access etcd renewed certificate for the API server to connect to kubelet renewed certificate embedded in the kubeconfig file for the controller manager to use renewed certificate for liveness probes to healthcheck etcd renewed certificate for etcd nodes to communicate with each other renewed certificate for serving etcd renewed certificate for the front proxy client renewed certificate embedded in the kubeconfig file for the scheduler manager to use renewed
Done renewing certificates. You must restart the kube-apiserver, kube-controller-manager, kube-scheduler and etcd, so that they can use the new certificates.
> kubeadm certs check-expiration [check-expiration] Reading configuration from the cluster... [check-expiration] FYI: You can look at this config file with 'kubectl -n kube-system get cm kubeadm-config -o yaml'
CERTIFICATE EXPIRES RESIDUAL TIME CERTIFICATE AUTHORITY EXTERNALLY MANAGED admin.conf Dec 28, 2021 00:06 UTC 364d no apiserver Dec 28, 2021 00:06 UTC 364d ca no apiserver-etcd-client Dec 28, 2021 00:06 UTC 364d etcd-ca no apiserver-kubelet-client Dec 28, 2021 00:06 UTC 364d ca no controller-manager.conf Dec 28, 2021 00:06 UTC 364d no etcd-healthcheck-client Dec 28, 2021 00:06 UTC 364d etcd-ca no etcd-peer Dec 28, 2021 00:06 UTC 364d etcd-ca no etcd-server Dec 28, 2021 00:06 UTC 364d etcd-ca no front-proxy-client Dec 28, 2021 00:06 UTC 364d front-proxy-ca no scheduler.conf Dec 28, 2021 00:06 UTC 364d no
CERTIFICATE AUTHORITY EXPIRES RESIDUAL TIME EXTERNALLY MANAGED ca Dec 24, 2029 07:18 UTC 8y no etcd-ca Dec 24, 2029 07:18 UTC 8y no front-proxy-ca Dec 24, 2029 07:18 UTC 8y no
