error: code = Unimplemented desc = unknown service runtime.v1.RuntimeService"

问题

"command failed" err="failed to run Kubelet: validate service connection: validate CRI v1 runtime API for endpoint unix:///run/containerd/containerd.sock": rpc error: code = Unimplemented desc = unknown service runtime.v1.RuntimeService"

这表明Kubelet无法通过CRI（容器运行时接口）与containerd建立连接。
1.确保containerd正在运行
systemctl status containerd
systemctl start containerd

2.检查containerd配置文件，确保Kubernetes所需的CRI插件已正确配置
containerd的默认配置文件位于/etc/containerd/config.toml
disabled_plugins = ["cri"] 注释掉
[plugins."io.containerd.grpc.v1.cri".containerd.runtimes.runc]
runtime_type = "io.containerd.runc.v2"
缺少此配置添加上述内容重新启动containerd服务

3.检查Kubelet配置文件，确保已正确设置containerd的地址
Kubelet的默认配置文件通常位于/var/lib/kubelet/config.yaml
runtimeRequestTimeout: 5m
containerRuntime:
name: containerd
endpoint: unix:///run/containerd/containerd.sock
缺少此配置添加上述内容重新启动 kubelet 服务