如何调试kubectl申请kube-flannel.yml？

我正在尝试按照以下文档创建一个kubernetes集群:https://kubernetes.io/docs/setup/independent/create-cluster-kubeadm/

首先,我在VirtualBox中使用Vagrant在Coreos(1520.9.0)上安装了带有docker镜像的kubeadm:

docker run -it \
    -v /etc:/rootfs/etc \
    -v /opt:/rootfs/opt \
    -v /usr/bin:/rootfs/usr/bin \
    -e K8S_VERSION=v1.8.4 \
    -e CNI_RELEASE=v0.6.0 \
    xakra/kubeadm-installer:0.4.7 coreos

这是我的kubeadm init:

kubeadm init --pod-network-cidr=10.244.0.0/16

运行命令时:

kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/v0.9.1/Documentation/kube-flannel.yml

它返回:

clusterrole "flannel" configured
clusterrolebinding "flannel" configured
serviceaccount "flannel" configured
configmap "kube-flannel-cfg" configured
daemonset "kube-flannel-ds" configured

但如果我检查"kubectl get pods --all-namespaces"

它返回:

NAMESPACE     NAME                              READY     STATUS             RESTARTS   AGE
kube-system   etcd-coreos1                      1/1       Running            0          18m
kube-system   kube-apiserver-coreos1            1/1       Running            0          18m
kube-system   kube-controller-manager-coreos1   0/1       CrashLoopBackOff   8          19m
kube-system   kube-scheduler-coreos1            1/1       Running            0          18m

随着journalctl -f -u kubelet我可以看到这个错误:Unable to update cni config: No networks found in /etc/cni/net.d

我怀疑这个命令有问题 kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/v0.9.1/Documentation/kube-flannel.yml

有没有办法知道为什么这个命令不起作用？我可以从任何地方获取一些日志吗？