# Kubernetes master issue

**URL:** <https://discuss.kubernetes.io/t/kubernetes-master-issue/10005>\
**Category:** General Discussions\
**Created:** [March 9, 2020, 1:42pm UTC](https://discuss.kubernetes.io/t/kubernetes-master-issue/10005 "2020-03-09T13:42:52Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![rocky](https://sea2.discourse-cdn.com/flex016/user_avatar/discuss.kubernetes.io/rocky/32/4720_2.png) [@rocky](https://discuss.kubernetes.io/u/rocky)\
**Post date:** [March 9, 2020, 1:42pm UTC](https://discuss.kubernetes.io/t/kubernetes-master-issue/10005/1 "2020-03-09T13:42:52Z")

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### Cluster information:

Kubernetes version: v1.15.6  
Cloud being used: (put bare-metal if not on a public cloud)  
Installation method: kubadm  
Host OS: centos7  
CNI and version: flannel  
CRI and version: 18.09.9

I have three master in my k8s cluster, they are very normal before today, but today one of them can’t connect the nodes, when I run “kubectl get ns” , it not response, even I run “ping nodes IP address”, it still can’t response, I don’t know why, can you some one have met kind of issues ? or give me some suggestions to understand why? thank you in advance.

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