Kubelet启动失败报错"the container runtime endpoint address was not specified or empty"的解决求助

大家好，我正在尝试在3台Rocky 9节点上用kubeadm部署Kubernetes v1.26集群，但遇到了kubelet启动的问题，希望能得到大家的帮助。

问题背景 #

我同时参考第三方教程和官方文档操作，安装完kubelet后，执行systemctl status kubelet看到kubelet一直在自动重启，状态信息如下：

● 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: activating (auto-restart) (Result: exit-code) since Mon 2023-03-27 19:45:05 EEST; 8s ago
Docs: https://kubernetes.io/docs/
Process: 17757 ExecStart=/usr/bin/kubelet $KUBELET_KUBECONFIG_ARGS $KUBELET_CONFIG_ARGS $KUBELET_KUBEADM_ARGS $KUBELET_EXTRA_ARGS (code=exited, status=1/>
Main PID: 17757 (code=exited, status=1/FAILURE)
CPU: 379ms

Mar 27 19:45:05 node01 systemd[1]: kubelet.service: Failed with result 'exit-code'.

查看journalctl日志，核心报错信息为：

Mar 27 19:34:40 node01 kubelet[13832]: E0327 19:34:40.638950 13832 run.go:74] "command failed" err="failed to validate kubelet flags: the container runtime endpoint address was not specified or empty, use --container-runtime-endpoint>

我已尝试的操作 #

• 我在kubelet的服务配置中添加了环境变量：

  Environment="KUBELET_EXTRA_ARGS=--container-runtime-endpoint=unix:///run/containerd/containerd.sock"

• 手动执行kubelet --container-runtime-endpoint=unix:///run/containerd/containerd.sock后，kubelet能够启动，但日志显示它处于独立运行模式，没有连接到API Server：

  I0327 19:52:34.967346   20609 server.go:412] "Kubelet version" kubeletVersion="v1.26.3"
  I0327 19:52:34.967701   20609 server.go:414] "Golang settings" GOGC="" GOMAXPROCS="" GOTRACEBACK=""
  I0327 19:52:34.968911   20609 server.go:575] "Standalone mode, no API client"
  I0327 19:52:34.987049   20609 server.go:463] "No api server defined - no events will be sent to API server"
  ...
  I0327 19:52:36.104388   20609 status_manager.go:172] "Kubernetes client is nil, not starting status manager"
  

现在我很困惑：为什么添加了端点参数后，systemctl管理的kubelet还是启动失败？而手动启动又只能进入独立模式，无法加入集群。有没有大佬能指点下问题出在哪？谢谢！

备注：内容来源于stack exchange，提问作者Lucian