问在k8s init阶段到wait-control-plane阶段报错？

[init] Using Kubernetes version: v1.15.3

[preflight] Running pre-flight checks

[WARNING IsDockerSystemdCheck]: detected "cgroupfs" as the Docker cgroup driver. The recommended driver is "systemd". Please follow the guide at https://kubernetes.io/docs/setup/cri/

[preflight] Pulling images required for setting up a Kubernetes cluste

[preflight] This might take a minute or two, depending on the speed of your internet connection

[preflight] You can also perform this action in beforehand using 'kubeadm config images pull'

[kubelet-start] Writing kubelet environment file with flags to file "/var/lib/kubelet/kubeadm-flags.env"

[kubelet-start] Writing kubelet configuration to file "/var/lib/kubelet/config.yaml"

[kubelet-start] Activating the kubelet service

[certs] Using certificateDir folder "/etc/kubernetes/pki"

[certs] Generating "front-proxy-ca" certificate and key

[certs] Generating "front-proxy-client" certificate and key

[certs] Generating "etcd/ca" certificate and key

[certs] Generating "apiserver-etcd-client" certificate and key

[certs] Generating "etcd/peer" certificate and key

[certs] etcd/peer serving cert is signed for DNS names [master localhost] and IPs [49.235.84.249 127.0.0.1 ::1]

[certs] Generating "etcd/healthcheck-client" certificate and key

[certs] Generating "etcd/server" certificate and key

[certs] etcd/server serving cert is signed for DNS names [master localhost] and IPs [49.235.84.249 127.0.0.1 ::1]

[certs] Generating "ca" certificate and key

[certs] Generating "apiserver" certificate and key

[certs] apiserver serving cert is signed for DNS names [master kubernetes kubernetes.default kubernetes.default.svc kubernetes.default.svc.cluster.local] and IPs [10.1.0.1 49.235.84.249]

[certs] Generating "apiserver-kubelet-client" certificate and key

[certs] Generating "sa" key and public key

[kubeconfig] Using kubeconfig folder "/etc/kubernetes"

[kubeconfig] Writing "admin.conf" kubeconfig file

[kubeconfig] Writing "kubelet.conf" kubeconfig file

[kubeconfig] Writing "controller-manager.conf" kubeconfig file

[kubeconfig] Writing "scheduler.conf" kubeconfig file

[control-plane] Using manifest folder "/etc/kubernetes/manifests"

[control-plane] Creating static Pod manifest for "kube-apiserver"

[control-plane] Creating static Pod manifest for "kube-controller-manager"

[control-plane] Creating static Pod manifest for "kube-scheduler"

[etcd] Creating static Pod manifest for local etcd in "/etc/kubernetes/manifests"

[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)

If you are on a systemd-powered system, you can try to troubleshoot the error with the following commands:

- 'systemctl status kubelet'

- 'journalctl -xeu kubelet'

Additionally, a control plane component may have crashed or exited when started by the container runtime.

To troubleshoot, list all containers using your preferred container runtimes CLI, e.g. docker.

Here is one example how you may list all Kubernetes containers running in docker:

- 'docker ps -a | grep kube | grep -v pause'

Once you have found the failing container, you can inspect its logs with:

- 'docker logs CONTAINERID'

error execution phase wait-control-plane: couldn't initialize a Kubernetes cluste

然后查看 kubelet log错误是

ces?limit=500&resourceVersion=0: dial tcp 49.235.84.249:6443: connect: connection refused

rage.k8s.io/v1beta1/csidrivers?limit=500&resourceVersion=0: dial tcp 49.235.84.249:6443: connect: connection refused

ods?fieldSelector=spec.nodeName%3Dmaster&limit=500&resourceVersion=0: dial tcp 49.235.84.249:6443: connect: connection refused

node.k8s.io/v1beta1/runtimeclasses?limit=500&resourceVersion=0: dial tcp 49.235.84.249:6443: connect: connection refused

eldSelector=metadata.name%3Dmaster&limit=500&resourceVersion=0: dial tcp 49.235.84.249:6443: connect: connection refused