kubernetes 그룹이 만들어진 후 node는 NotReady 상태에 있습니다

kubectl  get node
NAME                      STATUS     ROLES    AGE   VERSION
izm5e3cntl0pztm4dj3phrz   NotReady   master   69s   v1.15.4

service  kubelet status
● kubelet.service - kubelet: The Kubernetes Node Agent
   Loaded: loaded (/lib/systemd/system/kubelet.service; enabled; vendor preset: enabled)
  Drop-In: /etc/systemd/system/kubelet.service.d
           └─10-kubeadm.conf
   Active: active (running) since Mon 2019-10-28 14:40:53 CST; 2min 37s ago
     Docs: https://kubernetes.io/docs/home/
 Main PID: 9687 (kubelet)
    Tasks: 21 (limit: 4915)
   CGroup: /system.slice/kubelet.service
           └─9687 /usr/bin/kubelet --bootstrap-kubeconfig=/etc/kubernetes/bootstrap-kubelet.conf --kubeconfig=/etc/kubernetes/kubelet.conf --config=/var/lib/kubelet/config.yaml --cgroup-driver=systemd --network-p

Oct 28 14:43:13 iZm5e3cntl0pztm4dj3phrZ kubelet[9687]: E1028 14:43:13.883502    9687 kubelet.go:2173] Container runtime network not ready: NetworkReady=false reason:NetworkPluginNotReady message:docker: network p
Oct 28 14:43:18 iZm5e3cntl0pztm4dj3phrZ kubelet[9687]: W1028 14:43:18.363536    9687 cni.go:213] Unable to update cni config: No networks found in /etc/cni/net.d
Oct 28 14:43:18 iZm5e3cntl0pztm4dj3phrZ kubelet[9687]: E1028 14:43:18.884847    9687 kubelet.go:2173] Container runtime network not ready: NetworkReady=false reason:NetworkPluginNotReady message:docker: network p
Oct 28 14:43:23 iZm5e3cntl0pztm4dj3phrZ kubelet[9687]: W1028 14:43:23.363828    9687 cni.go:213] Unable to update cni config: No networks found in /etc/cni/net.d
Oct 28 14:43:23 iZm5e3cntl0pztm4dj3phrZ kubelet[9687]: E1028 14:43:23.886093    9687 kubelet.go:2173] Container runtime network not ready: NetworkReady=false reason:NetworkPluginNotReady message:docker: network p
Oct 28 14:43:28 iZm5e3cntl0pztm4dj3phrZ kubelet[9687]: W1028 14:43:28.364040    9687 cni.go:213] Unable to update cni config: No networks found in /etc/cni/net.d
Oct 28 14:43:28 iZm5e3cntl0pztm4dj3phrZ kubelet[9687]: E1028 14:43:28.887429    9687 kubelet.go:2173] Container runtime network not ready: NetworkReady=false reason:NetworkPluginNotReady message:docker: network p
Oct 28 14:43:29 iZm5e3cntl0pztm4dj3phrZ kubelet[9687]: W1028 14:43:29.705262    9687 watcher.go:87] Error while processing event ("/sys/fs/cgroup/devices/libcontainer_11383_systemd_test_default.slice": 0x40000100
Oct 28 14:43:29 iZm5e3cntl0pztm4dj3phrZ kubelet[9687]: W1028 14:43:29.798080    9687 watcher.go:87] Error while processing event ("/sys/fs/cgroup/memory/libcontainer_11420_systemd_test_default.slice": 0x40000100 
Oct 28 14:43:29 iZm5e3cntl0pztm4dj3phrZ kubelet[9687]: W1028 14:43:29.798138    9687 watcher.go:87

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