问题描述
配置master节点时，执行kubeadm init --config kubeadm-config.yaml --v=5命令后，执行至初始化Pod步骤时报错：
[wait-control-plane] Waiting for the kubelet to boot up the control plane as static Pods from directory "/etc/kubernetes/manifests". This can take up to 4m0s
[kubelet-check] Initial timeout of 40s passed.
Unfortunately, an error has occurred:
timed out waiting for the condition
This error is likely caused by:
- The kubelet is not running
- The kubelet is unhealthy due to a misconfiguration of the node in some way (required cgroups disabled)
......
经过检查，host配置无误，cluster的IP地址也与本机相同
解决方案
报错后百度到几个可能有用的解决方法，但没能解决问题，最后发现是由于个人疏忽，忘记配置containerd
以下把几种方法列出供参考：
修改/lib/systemd/system/kubelet.service，添加kubelet启动参数如下：
[Service]
ExecStart=/usr/bin/kubelet --kubeconfig=/etc/kubernetes/kubelet.conf --config=/var/lib/kubelet/config.yaml
然后重启计算机，执行sudo kubeadm reset后重新执行sudo kubeadm init
到/etc/docker/daemon.json配置文件中，至少添加如下一段内容，修改docker的cgroup驱动：
{
"exec-opts":["native.cgroupdriver=systemd"]
}
然后执行sudo systemctl restart docker重启docker，执行sudo kubeadm reset并重新sudo kubeadm init
将docker 的版本换成 19.03.9
kube* 版本换成 kubelet-1.17.3 kubeadm-1.17.3 kubectl-1.17.3
以上几种方法都没能解决问题，后来发现问题也许出在containerd上
以下是解决了我的问题的方案：
首先进行初始化：mkdir -p /etc/containerd，然后生成配置文件：containerd config default | sudo tee /etc/containerd/config.toml
然后编辑配置文件：sudo vi /etc/containerd/config.toml：
[plugins."io.containerd.grpc.v1.cri"]
# k8s.gcr.io/pause:3.6改为"registry.aliyuncs.com/google_containers/pause:3.9"
sandbox_image = "registry.aliyuncs.com/google_containers/pause:3.9"
[plugins."io.containerd.grpc.v1.cri".containerd.runtimes.runc.options]
# SystemdCgroup，false改为true
SystemdCgroup = true
[plugins."io.containerd.grpc.v1.cri".registry]
# config_path，配置镜像加速地址（此目录之后手动创建）
config_path = "/etc/containerd/certs.d"
# 配置k8s拉取时的镜像
[plugins."io.containerd.grpc.v1.cri".registry.mirrors."docker.io"]
endpoint = ["https://ok5mwqnl.mirror.aliyuncs.com","https://docker.1ms.run"]
[plugins."io.containerd.grpc.v1.cri".registry.mirrors."k8s.gcr.io"]
endpoint = ["registry.aliyuncs.com/google_containers"]
然后创建目录：mkdir /etc/containerd/certs.d/docker.io -pv，在docker.io中新建一个hosts.toml文件，文件中的镜像链接是配置docker时得到的镜像链接：
# hosts.toml
server = "https://docker.io"
[host."https://ok5mwqnl.mirror.aliyuncs.com"]
capabilities = ["pull", "resolve"]
配置并加载containerd的内核模块：sudo vi /etc/modules-load.d/containerd.conf：
# containerd.conf
overlay
br_netfilter
最后执行sudo modprobe overlay、sudo modprobe br_netfilter即可
参考
历尽艰辛的问题：Waiting for the kubelet to boot up the control plane……This can take up to 4m0s
关于Kubernetes-v1.23.6-初始化时报错[kubelet-check] It seems like the kubelet isn’t running or healthy
k8s初始化master失败 Waiting for the kubelet to boot up the control plane asInitial timeout of 40s passed.