Kubernetes CSR 处于待处理状态答案

【问题标题】：kubernetes CSR in pending statusKubernetes CSR 处于待处理状态
【发布时间】：2021-10-12 10:12:46
【问题描述】：

几天以来，在环境没有任何变化的情况下，其中一个运行 kubernetes 1.19.9 on-prem 的集群显示了一些关于 kubelet 证书的错误。

由于证书过期，节点处于 NON-READY 状态。调查了一下，我发现 CSR 处于挂起状态。我可以手动批准它们，但根本没有发出。

我尝试将这些节点重新加入集群，但在获得 CSR 批准后我面临同样的情况。

例子：

NAME        AGE     SIGNERNAME                                    REQUESTOR                        CONDITION
csr-4dc9x   3m28s   kubernetes.io/kube-apiserver-client-kubelet   system:node:vm-k8s-ctrl-prod-1   Pending
csr-4xljn   18m     kubernetes.io/kube-apiserver-client-kubelet   system:node:vm-k8s-wk-stage-9    Pending
csr-6jdmg   3m19s   kubernetes.io/kube-apiserver-client-kubelet   system:node:vm-k8s-wk-stage-6    Pending
csr-9lr8n   18m     kubernetes.io/kube-apiserver-client-kubelet   system:node:vm-k8s-wk-stage-6    Pending
csr-g2pjt   3m35s   kubernetes.io/kube-apiserver-client-kubelet   system:node:vm-k8s-ctrl-prod-2   Pending

企业社会责任示例：

apiVersion: certificates.k8s.io/v1
kind: CertificateSigningRequest
metadata:
  creationTimestamp: "2021-08-08T10:10:19Z"
  generateName: csr-
  managedFields:
  - apiVersion: certificates.k8s.io/v1
    fieldsType: FieldsV1
    fieldsV1:
      f:metadata:
        f:generateName: {}
      f:spec:
        f:request: {}
        f:signerName: {}
        f:usages: {}
    manager: kubelet
    operation: Update
    time: "2021-08-08T10:10:19Z"
  name: csr-4dc9x
  resourceVersion: "775314577"
  selfLink: /apis/certificates.k8s.io/v1/certificatesigningrequests/csr-4dc9x
  uid: 8c51be15-4ec4-4dc7-8a7a-486e27c74607
spec:
  groups:
  - system:nodes
  - system:authenticated
  request: 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
  signerName: kubernetes.io/kube-apiserver-client-kubelet
  usages:
  - digital signature
  - key encipherment
  - client auth
  username: system:node:vm-k8s-ctrl-prod-1
status: {}

有没有人遇到过同样的情况？我检查了集群中的所有证书，对我来说一切都很好。


CERTIFICATE                EXPIRES                  RESIDUAL TIME   CERTIFICATE AUTHORITY   EXTERNALLY MANAGED
admin.conf                 Jun 10, 2022 22:17 UTC   306d                                    no
apiserver                  Jun 10, 2022 22:16 UTC   306d            ca                      no
apiserver-kubelet-client   Jun 10, 2022 22:16 UTC   306d            ca                      no
controller-manager.conf    Jun 10, 2022 22:17 UTC   306d                                    no
front-proxy-client         Jun 10, 2022 22:16 UTC   306d            front-proxy-ca          no
scheduler.conf             Jun 10, 2022 22:17 UTC   306d                                    no

CERTIFICATE AUTHORITY   EXPIRES                  RESIDUAL TIME   EXTERNALLY MANAGED
ca                      Apr 07, 2029 17:39 UTC   7y              no
front-proxy-ca          Apr 07, 2029 17:39 UTC   7y              no

提前致谢

【问题讨论】：

你好@trookam。需要明确的是，手动批准 CSR 没有帮助？
不，还是不行

标签： ssl kubernetes certificate kubelet

【解决方案1】：

以防万一其他人面临这种情况。问题是主节点上 kubelet 的旧配置。

https://serverfault.com/questions/1065444/how-can-i-find-which-kubernetes-certificate-has-expired

手动重新配置控制器上的 kubelet.conf 并重新启动控制平面，修复了问题。

谢谢

【讨论】：