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11月 05 10:58:35 localhost.localdomain kubelet[974]: E1105 10:58:35.108952     974 kubelet.go:2412] "Error getting node" err="node "localhost.localdomain" not found"
11月 05 10:58:35 localhost.localdomain kubelet[974]: E1105 10:58:35.209293     974 kubelet.go:2412] "Error getting node" err="node "localhost.localdomain" not found"
11月 05 10:58:35 localhost.localdomain kubelet[974]: E1105 10:58:35.310543     974 kubelet.go:2412] "Error getting node" err="node "localhost.localdomain" not found"
11月 05 10:58:35 localhost.localdomain kubelet[974]: E1105 10:58:35.411121     974 kubelet.go:2412] "Error getting node" err="node "localhost.localdomain" not found"
11月 05 10:58:35 localhost.localdomain kubelet[974]: E1105 10:58:35.511949     974 kubelet.go:2412] "Error getting node" err="node "localhost.localdomain" not found"
11月 05 10:58:35 localhost.localdomain kubelet[974]: E1105 10:58:35.612822     974 kubelet.go:2412] "Error getting node" err="node "localhost.localdomain" not found"
11月 05 10:58:35 localhost.localdomain kubelet[974]: E1105 10:58:35.713249     974 kubelet.go:2412] "Error getting node" err="node "localhost.localdomain" not found"
11月 05 10:58:35 localhost.localdomain kubelet[974]: E1105 10:58:35.781263     974 controller.go:144] failed to ensure lease exists, will retry in 7s, error: leases.coordination.k8s.io "localhost.localdomain" is forbidden: User "system:node:k8s222" cannot get resource "leases" in API group "coordination.k8s.io" in the namespace "kube-node-lease": can only access node lease with the same name as the requesting node
11月 05 10:58:35 localhost.localdomain kubelet[974]: E1105 10:58:35.813355     974 kubelet.go:2412] "Error getting node" err="node "localhost.localdomain" not found"
11月 05 10:58:35 localhost.localdomain kubelet[974]: E1105 10:58:35.913495     974 kubelet.go:2412] "Error getting node" err="node "localhost.localdomain" not found"

1.1 该节点一直NotReady

[root@crust-m01 ~]# kubectl get node
NAME        STATUS     ROLES                  AGE   VERSION
k8s220   NotReady   control-plane,master   44d   v1.21.3
k8s221   NotReady   <none>                 44d   v1.21.3
k8s222   NotReady   <none>                 44d   v1.21.3

1.2 查看该节点详细信息

[root@localhost ~]# kubectl describe node k8s221


……
Unschedulable:      false
Lease:
  HolderIdentity:  k8s221
  AcquireTime:     <unset>
  RenewTime:       Tue, 28 Sep 2021 14:37:08 +0800
Conditions:
  Type             Status    LastHeartbeatTime                 LastTransitionTime                Reason              Message
  ----             ------    -----------------                 ------------------                ------              -------
  MemoryPressure   Unknown   Tue, 28 Sep 2021 14:32:16 +0800   Tue, 28 Sep 2021 14:38:17 +0800   NodeStatusUnknown   Kubelet stopped posting node status.
  DiskPressure     Unknown   Tue, 28 Sep 2021 14:32:16 +0800   Tue, 28 Sep 2021 14:38:17 +0800   NodeStatusUnknown   Kubelet stopped posting node status.
  PIDPressure      Unknown   Tue, 28 Sep 2021 14:32:16 +0800   Tue, 28 Sep 2021 14:38:17 +0800   NodeStatusUnknown   Kubelet stopped posting node status.
  Ready            Unknown   Tue, 28 Sep 2021 14:32:16 +0800   Tue, 28 Sep 2021 14:38:17 +0800   NodeStatusUnknown   Kubelet stopped posting node status.
……

1.3 该节点上查看kubelet日志

[root@crust-m2 ~]# service kubelet status -l
Redirecting to /bin/systemctl status  -l kubelet.service
● kubelet.service - kubelet: The Kubernetes Node Agent
   Loaded: loaded (/usr/lib/systemd/system/kubelet.service; enabled; vendor preset: disabled)
  Drop-In: /usr/lib/systemd/system/kubelet.service.d
           └─10-kubeadm.conf
   Active: active (running) since 二 2021-09-28 14:51:57 CST; 4min 6s ago
     Docs: https://kubernetes.io/docs/
 Main PID: 21165 (kubelet)
    Tasks: 19
   Memory: 43.0M
   CGroup: /system.slice/kubelet.service
           └─21165 /usr/bin/kubelet --bootstrap-kubeconfig=/etc/kubernetes/bootstrap-kubelet.conf --kubeconfig=/etc/kubernetes/kubelet.conf --config=/var/lib/kubelet/config.yaml --network-plugin=cni --pod-infra-container-image=registry.aliyuncs.com/google_containers/pause:3.4.1

9月 28 14:56:03 crust-m2 kubelet[21165]: E0928 14:56:03.119645   21165 kubelet.go:2291] "Error getting node" err="node "crust-m2" not found"
9月 28 14:56:03 crust-m2 kubelet[21165]: E0928 14:56:03.220694   21165 kubelet.go:2291] "Error getting node" err="node "crust-m2" not found"
9月 28 14:56:03 crust-m2 kubelet[21165]: E0928 14:56:03.321635   21165 kubelet.go:2291] "Error getting node" err="node "crust-m2" not found"
9月 28 14:56:03 crust-m2 kubelet[21165]: E0928 14:56:03.385100   21165 eviction_manager.go:255] "Eviction manager: failed to get summary stats" err="failed to get node info: node "crust-m2" not found"
9月 28 14:56:03 crust-m2 kubelet[21165]: E0928 14:56:03.422387   21165 kubelet.go:2291] "Error getting node" err="node "crust-m2" not found"
9月 28 14:56:03 crust-m2 kubelet[21165]: E0928 14:56:03.523341   21165 kubelet.go:2291] "Error getting node" err="node "crust-m2" not found"
9月 28 14:56:03 crust-m2 kubelet[21165]: E0928 14:56:03.624021   21165 kubelet.go:2291] "Error getting node" err="node "crust-m2" not found"
9月 28 14:56:03 crust-m2 kubelet[21165]: E0928 14:56:03.724418   21165 kubelet.go:2291] "Error getting node" err="node "crust-m2" not found"
9月 28 14:56:03 crust-m2 kubelet[21165]: E0928 14:56:03.825475   21165 kubelet.go:2291] "Error getting node" err="node "crust-m2" not found"
9月 28 14:56:03 crust-m2 kubelet[21165]: E0928 14:56:03.926199   21165 kubelet.go:2291] "Error getting node" err="node "crust-m2" not found"

2. 【排错】

• 1.3中日志输出的启动命令如下

  /usr/bin/kubelet --bootstrap-kubeconfig=/etc/kubernetes/bootstrap-kubelet.conf --kubeconfig=/etc/kubernetes/kubelet.conf --config=/var/lib/kubelet/config.yaml --network-plugin=cni --pod-infra-container-image=registry.aliyuncs.com/google_containers/pause:3.4.1

查看并分析启动命令中所有配置文件都没有问题

• 发现1.3 中输出的错误err="node "localhost.localdomain" not found
  而master上 kubectl get node 的信息 三个node是 k8s220，k8s221，k8s222

• 结论
  之前安装kubernetes的时候，master的名字是 k8s220，node是k8s221，k8s222，因为 /etc/hostname 中默认写成了 localhost.localdomain，因此kubelet一直报错

3. 【修改】

• 修改hostname文件，并执行hostname命令修改服务器名称
• 重启kubelete

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