k8s1.21安装flannel插件（v0.13.1-rc2）报错

所有节点一直notready

[root@master ~]# kubectl get node
NAME     STATUS     ROLES                  AGE   VERSION
master   NotReady   control-plane,master   12h   v1.21.0
node1    NotReady                    12h   v1.21.0
node2    NotReady                    12h   v1.21.0

查看kubelet日志报错

Nov 20 21:00:53 master kubelet[34695]: I1120 21:00:53.926251   34695 cni.go:204] "Error validating CNI config list" configList="{\n  \"name\": \"cbr0\",\n  \"plugins\": [\n    {\n      \"type\": \"flannel\",\n      \"delegate\": {\n        \"hairpinMode\": true,\n        \"isDefaultGateway\": true\n      }\n    },\n    {\n      \"type\": \"portmap\",\n      \"capabilities\": {\n        \"portMappings\": true\n      }\n    }\n  ]\n}\n" err="[failed to find plugin \"flannel\" in path [/opt/cni/bin]]"
Nov 20 21:00:53 master kubelet[34695]: I1120 21:00:53.926314   34695 cni.go:239] "Unable to update cni config" err="no valid networks found in /etc/cni/net.d"
Nov 20 21:00:55 master kubelet[34695]: E1120 21:00:55.170484   34695 kubelet.go:2218] "Container runtime network not ready" networkReady="NetworkReady=false reason:NetworkPluginNotReady message:docker: network plugin is not ready: cni config uninitialized"
Nov 20 21:00:58 master kubelet[34695]: I1120 21:00:58.935344   34695 cni.go:204] "Error validating CNI config list" configList="{\n  \"name\": \"cbr0\",\n  \"plugins\": [\n    {\n      \"type\": \"flannel\",\n      \"delegate\": {\n        \"hairpinMode\": true,\n        \"isDefaultGateway\": true\n      }\n    },\n    {\n      \"type\": \"portmap\",\n      \"capabilities\": {\n        \"portMappings\": true\n      }\n    }\n  ]\n}\n" err="[failed to find plugin \"flannel\" in path [/opt/cni/bin]]"
Nov 20 21:00:58 master kubelet[34695]: I1120 21:00:58.935442   34695 cni.go:239] "Unable to update cni config" err="no valid networks found in /etc/cni/net.d"
Nov 20 21:01:00 master kubelet[34695]: E1120 21:01:00.269921   34695 kubelet.go:2218] "Container runtime network not ready" networkReady="NetworkReady=false reason:NetworkPluginNotReady message:docker: network plugin is not ready: cni config uninitialized"

检查网络插件有没安装kubernetes-cni

yum clean all && yum makecache && yum -y install kubernetes-cni

报错都提示得算很明显了。。。

docker: network plugin is not ready: cni config uninitialized" 等等等，
你确定所需要安装的包，和所需要设置是否正确啊？

嗯，建议卸载环境，重新安装。可以依照这个实例步骤去安装【也可对比看一下问题】：https://www.cnblogs.com/skyzy/p/16891033.html

k8s 安装pod网络插件（flannel）报错以及解决方法
https://blog.csdn.net/weixin_51720711/article/details/120047138