# 创建自动批准 CSR 请求的 ClusterRole
kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: system:certificates.k8s.io:certificatesigningrequests:selfnodeserver
rules:
- apiGroups: ["certificates.k8s.io"]
  resources: ["certificatesigningrequests/selfnodeserver"]
  verbs: ["create"]
---
# 开启 bootstrappers 节点创建 CSR 请求,用户 kubelet-bootstrap 绑定到system:node-bootstrapper
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: create-csrs-for-bootstrapping
subjects:
- kind: User
  name: kubelet-bootstrap
  apiGroup: rbac.authorization.k8s.io
roleRef:
  kind: ClusterRole
  name: system:node-bootstrapper
  apiGroup: rbac.authorization.k8s.io
---
# 自动批准 kubelet-bootstrap 首次申请证书的 CSR 请求
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: auto-approve-csrs-for-group
subjects:
- kind: User
  name: kubelet-bootstrap
  apiGroup: rbac.authorization.k8s.io
roleRef:
  kind: ClusterRole
  name: system:certificates.k8s.io:certificatesigningrequests:nodeclient
  apiGroup: rbac.authorization.k8s.io
---
# 自动批准 system:nodes 组用户自动更新证书的 CSR 请求
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: auto-approve-renewals-for-nodes
subjects:
- kind: Group
  name: system:nodes
  apiGroup: rbac.authorization.k8s.io
roleRef:
  kind: ClusterRole
  name: system:certificates.k8s.io:certificatesigningrequests:selfnodeclient
  apiGroup: rbac.authorization.k8s.io
---
# 自动批准 system:nodes 组用户自动更新证书的 CSR 请求
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: node-server-auto-renew-crt
subjects:
- kind: Group
  name: system:nodes
  apiGroup: rbac.authorization.k8s.io
roleRef:
  kind: ClusterRole
  name: system:certificates.k8s.io:certificatesigningrequests:selfnodeserver
  apiGroup: rbac.authorization.k8s.io

kube-controller 需要添加配置

--feature-gates=RotateKubeletServerCertificate=true \
--cluster-signing-duration=87600h0m0s

kubelet需要添加配置

--feature-gates=RotateKubeletClientCertificate=true,RotateKubeletServerCertificate=true \
--rotate-certificates \