[Kubernetes] network is not ready: container runtime network not ready: NetworkReady=false reason:NetworkPluginNotReady message:Network plugin returns error: cni plugin not initialized

해결방법

## worker 노드는 이미 조인이 되어있어두 되고 이후에 해도 관계없다. $ kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml ## 정상적으로 설치되었다면 /run/flannel/subnet.env 파일이 생성되어야한다. root@master:~# cat /run/flannel/subnet.env  FLANNEL_NETWORK=10.244.0.0/16 FLANNEL_SUBNET=10.244.0.1/24 FLANNEL_MTU=1450 FLANNEL_IPMASQ=true root@master:~# ## 워커 노들의 join 토큰을 출력 $  kubeadm token create --print-join-command