这样安装的集群证书有效期是一年吧？kubeadm源码里面写死的是1年。 about kubeadm-ha

[cookeem]

是的，快过期之前再用kubeadm重新生成一次证书就可以了。

[leeningli]

证书重新生成有单独的步骤吗？不是在kubeadm init时候生成的吗？中途重新生成的方法是怎么样的？对集群以及集群上的业务会有影响的吧。

[salwell]

还有1年的时效限制啊，是每个master中ca.key和ca.crt要更换，还是使用ca.key和ca.crt签署apiserver证书？

[salwell]

不过1年时间，早就换了N个版本了···

[cookeem]

@leeningli

$ kubeadm alpha phase certs --help
This command is not meant to be run on its own. See list of available subcommands.

Usage:
  kubeadm alpha phase certs [command]

Aliases:
  certs, certificates

Available Commands:
  all                      Generates all PKI assets necessary to establish the control plane
  apiserver                Generates an API server serving certificate and key
  apiserver-etcd-client    Generates a client certificate for the API server to connect to etcd securely
  apiserver-kubelet-client Generates a client certificate for the API server to connect to the kubelets securely
  ca                       Generates a self-signed kubernetes CA to provision identities for components of the cluster
  etcd-ca                  Generates a self-signed CA to provision identities for etcd
  etcd-healthcheck-client  Generates a client certificate for liveness probes to healthcheck etcd
  etcd-peer                Generates an etcd peer certificate and key
  etcd-server              Generates an etcd serving certificate and key
  front-proxy-ca           Generates a front proxy CA certificate and key for a Kubernetes cluster
  front-proxy-client       Generates a front proxy CA client certificate and key for a Kubernetes cluster
  sa                       Generates a private key for signing service account tokens along with its public key

[cookeem]

如果ca证书没有过期，是不需要替换的。v1.13的kubeam开始支持cert renew，官方推荐的方式。
如果你是用v1.11.X版本，建议进行升级，最近爆出来高危漏洞，可获取集群所有节点的root权限，建议进行升级到v1.11.5。 @dotbalo

[cookeem]

还没有，但是据说已经不是alpha了