主节点：192.168.252.141 node-05
从节点：192.168.252.142 node-06
两台虚拟机都已经安装好了

[root@localhost local]# kubectl get node
NAME      STATUS   ROLES    AGE    VERSION
node-05   Ready    master   129m   v1.19.3

[root@localhost local]# kubectl get node
NAME      STATUS   ROLES    AGE   VERSION
node-06   Ready    master   43m   v1.19.3

免密登录也安装好了，我在主节点上执行kubeadm join从节点的时候报如下异常，请问怎么才能把这两个节点关联起来？

[root@localhost local]# kubeadm join 192.168.252.142:6443 --token ujnpms.rk31xjmymfhxuav1     --discovery-token-ca-cert-hash sha256:167a66c5934305ab60c85940df57bcd75504dd3e30252aa0ee94baf311269522
[preflight] Running pre-flight checks
        [WARNING SystemVerification]: this Docker version is not on the list of validated versions: 20.10.10. Latest validated version: 19.03
error execution phase preflight: [preflight] Some fatal errors occurred:
        [ERROR DirAvailable--etc-kubernetes-manifests]: /etc/kubernetes/manifests is not empty
        [ERROR FileAvailable--etc-kubernetes-kubelet.conf]: /etc/kubernetes/kubelet.conf already exists
        [ERROR Port-10250]: Port 10250 is in use
        [ERROR FileAvailable--etc-kubernetes-pki-ca.crt]: /etc/kubernetes/pki/ca.crt already exists
[preflight] If you know what you are doing, you can make a check non-fatal with `--ignore-preflight-errors=...`
To see the stack trace of this error execute with --v=5 or higher