docker - Kubernetes 集群中处于挂起状态的 Coredns

Question

我正在尝试配置一个 2 节点 Kubernetes 集群。首先，我尝试在 CentOS VM 上配置集群的主节点。我已经使用 'kubeadm init --apiserver-advertise-address=172.16.100.6 --pod-network-cidr=10.244.0.0/16' 初始化了集群并将 flannel 网络部署到集群。但是当我做'kubectl get nodes'时，我得到以下输出----

[root@kubernetus ~]# kubectl get nodes
NAME         STATUS     ROLES    AGE   VERSION
kubernetus   NotReady   master   57m   v1.12.0

以下是“kubectl get pods --all-namespaces -o wide”的输出——

[root@kubernetus ~]# kubectl get pods --all-namespaces -o wide
NAMESPACE     NAME                                 READY   STATUS    RESTARTS   AGE   IP             NODE         NOMINATED NODE
kube-system   coredns-576cbf47c7-9x59x             0/1     Pending   0          58m   <none>         <none>       <none>
kube-system   coredns-576cbf47c7-l52wc             0/1     Pending   0          58m   <none>         <none>       <none>
kube-system   etcd-kubernetus                      1/1     Running   2          57m   172.16.100.6   kubernetus   <none>
kube-system   kube-apiserver-kubernetus            1/1     Running   2          57m   172.16.100.6   kubernetus   <none>
kube-system   kube-controller-manager-kubernetus   1/1     Running   1          57m   172.16.100.6   kubernetus   <none>
kube-system   kube-proxy-hr557                     1/1     Running   1          58m   172.16.100.6   kubernetus   <none>
kube-system   kube-scheduler-kubernetus            1/1     Running   1          57m   172.16.100.6   kubernetus   <none>

coredns 在很长一段时间内都处于挂起状态。我已经多次删除 docker 和 kubectl、kubeadm、kubelet 并尝试重新创建集群，但每次都显示相同的输出。有人可以帮我解决这个问题吗？

Answer 1

Unable to update cni config: No networks found in /etc/cni/net.d ..... Oct 02 19:21:32 kubernetus kubelet[19007]: E1002 19:21:32.886170 19007 kubelet.go:2167] Container runtime network not ready: NetworkReady=false reason:NetworkPluginNotReady message:docker: network plugin is not ready: cni config uninitialized

根据此错误，您忘记初始化 Kubernetes Pod 网络附加组件。看看你的设置，我想它应该是法兰绒。

以下是 Kubernetes 官方文档中的说明:

For flannel to work correctly, you must pass --pod-network-cidr=10.244.0.0/16 to kubeadm init.

Set /proc/sys/net/bridge/bridge-nf-call-iptables to 1 by running sysctl net.bridge.bridge-nf-call-iptables=1 to pass bridged IPv4 traffic to iptables’ chains. This is a requirement for some CNI plugins to work, for more information please see here.

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

Note that flannel works on amd64, arm, arm64 and ppc64le, but until flannel v0.11.0 is released you need to use the following manifest that supports all the architectures:

kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/c5d10c8/Documentation/kube-flannel.yml

欲了解更多信息，您可以访问此 link .