kubectl apply yield 禁止，检索当前配置时出错

Question

followed steps to create single master cluster，我能够成功初始化master，但是当应用时我得到forbidden错误，有人遇到过同样的情况吗？谢谢！

我做了以下

1. disable selinux in /etc/selinux/config, and reboot
2. comment out KUBELET_NETWORK_ARGS in 
         /etc/systemd/system/kubelet.service.d/10-kubeadm.conf
3. export no_proxy=$no_proxy,<master-ip> 
4. export KUBECONFIG=/etc/kubernetes/kubelet.conf in .bash_profile

初始化成功后，尝试应用时

kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/v0.10.0/Documentation/kube-flannel.yml

我收到以下错误消息

Error from server (Forbidden): error when retrieving current configuration of:
&{0xc42048ab40 0xc421a83730  
flannel https://raw.githubusercontent.com/coreos/flannel/v0.10.0/Documentation/kube-flannel.yml 0xc42109cc20  false}
from server for: "https://raw.githubusercontent.com/coreos/flannel/v0.10.0/Documentation/kube-flannel.yml": 
clusterroles.rbac.authorization.k8s.io "flannel" is forbidden: 
User "system:node:<master-server-name>" 
cannot get clusterroles.rbac.authorization.k8s.io at the cluster scope

Answer 1

一旦您的集群尚未完全正常运行，将其拆除并从头开始重新创建会更容易：

拆除一切：

$> sudo su
#> kubeadm reset
#> rm -rf $HOME/.kube /etc/kubernetes

准备你的主机（以防万一你还没有这样做）：

#> swapoff -a
## Don't forget to comment swap partition line in /etc/fstab

## I assume that you have these packages already installed: docker, kubeadm, kubectl

## tune sysctl to pass bridged IPv4 traffic to iptables’ chains. 
## This is a requirement for some CNI plugins to work, for more information please see
## https://kubernetes.io/docs/concepts/cluster-administration/network-plugins/#network-plugin-requirements

#> cat <<EOF >>/etc/ufw/sysctl.conf
net/bridge/bridge-nf-call-ip6tables = 1
net/bridge/bridge-nf-call-iptables = 1
net/bridge/bridge-nf-call-arptables = 1
EOF
#> sudo sysctl --system

初始化集群：

## Do not try to set less than /16 subnet for `--pod-network-cidr`

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

## Prepare the kubectl config

#> mkdir -p $HOME/.kube
#> cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
#> chown $(id -u):$(id -g) $HOME/.kube/config

安装法兰绒

#> kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/v0.10.0/Documentation/kube-flannel.yml

允许在主节点上调度 Pod。

（以防万一您没有任何工作节点。）

#> kubectl taint nodes --all node-role.kubernetes.io/master-

此时你应该已经有了现成的 Kubernetes 集群：

#> kubectl get nodes
#> kubectl get pods --all-namespaces

Answer 2

您不知何故从使用 cluster-admin kubeconfig（具有超级用户访问权限）切换到使用主节点 kubeconfig（只能访问 kubelet/节点应该能够做的事情）

Answer 3

cp -i /etc/kubernetes/admin.conf $HOME/.kube/config

而不是

cp -i /etc/kubernetes/kubelet.conf ~/.kube/config