K8S安装node加入到节点错误Running pre-flight checks百分百解决，其他的都是片面的

Posted 2022-09-03 码海兴辰

天下文章一大把，往往少部分才能解决细问题

一：错误报错

Running pre-flight checks
  [WARNING IsDockerSystemdCheck]: detected "cgroupfs" as the Docker cgroup driver. The recommended driver is "systemd". Please follow the guide at https://kubernetes.io/docs/setup/cri/
  [WARNING SystemVerification]: this Docker version is not on the list of validated versions: 20.10.7. Latest validated version: 19.03
  [WARNING Hostname]: hostname "k8snode1" could not be reached
  [WARNING Hostname]: hostname "k8snode1": lookup k8snode1 on 114.114.114.114:53: no such host
error execution phase preflight: couldnt validate the identity of the API Server: Get "https://cluster-endpoint:6443/api/v1/namespaces/kube-public/configmaps/cluster-info?timeout=10s": dial tcp 172.100.101.60:6443: connect: no route to host

我看网上说什么时间没有同步或者token过期，这个原因可能有些人有，但是我相信大部分人不是，其实很简单就是master主节点没有关闭防火墙的缘故

二：解决方法

关闭master主节点的防火墙

systemctl disable firewalld --now

如下操作：

三：效果

现在进行加入

kubeadm join cluster-endpoint:6443 --token q2bf0w.c86t03p42oaelbcs     --discovery-token-ca-cert-hash sha256:4310d694be8295f3b6eba06f44e98c0f589f610e8f59af3d00e62012aaafad1b 

这不就加进去了

 运行kubectl get nodes 可以看到子节点已经加进去了