问题描述：
在搭建k8s集群时，将共工作节点添加到主节点是报如下错误：
couldn‘t validate the identity of the API Server
原因：
默认token有效期24小时，过期之后，该token就不可用了，需要重新创建token。如果没有过期，也可以通过重新创建token解决
解决方案：
# master 查看节点检查token是否有效 kubeadm token list # 生成新的token和命令。然后在node重新执行 kubeadm token create --print-join-command
执行结果：
[root@master ~]# kubeadm token list TOKEN TTL EXPIRES USAGES DESCRIPTION EXTRA GROUPS ag8915.91ayg7fogy9fffne 23h 2020-10-12T04:35:36-04:00 authentication,signing The default bootstrap token generated by 'kubeadm init'. system:bootstrappers:kubeadm:default-node-token [root@master ~]# kubeadm token create --print-join-command W1011 04:43:25.926122 21015 configset.go:202] WARNING: kubeadm cannot validate component configs for API groups [kubelet.config.k8s.io kubeproxy.config.k8s.io] kubeadm join 192.168.136.201:6443 --token 17wwni.taqxzqa3our1wh92 --discovery-token-ca-cert-hash sha256:1472821b3c34f13bc5d7264a737739e9854195b1856a00d2256c79d25118b2e
在 node节点中执行新的token和命令
kubeadm join 192.168.136.201:6443 --token 17wwni.taqxzqa3our1wh92 --discovery-token-ca-cert-hash sha256:1472821b3c34f13bc5d7264a737739e9854195b1856a00d2256c79d25118b2e
[root@node1 ~]# kubeadm join 192.168.136.201:6443 --token ag8915.91ayg7fogy9fffne --discovery-token-ca-cert-hash sha256:1472821b3c34f13bc5d7264a737739e9854195b1856a00d2256c79d25118b2e W1011 04:43:30.597584 18709 join.go:346] [preflight] WARNING: JoinControlPane.controlPlane settings will be ignored when control-plane flag is not set. [preflight] 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 Hostname]: hostname "node1" could not be reached [WARNING Hostname]: hostname "node1": lookup node1 on 8.8.8.8:53: read udp 192.168.136.202:59744->8.8.8.8:53: i/o timeout error execution phase preflight: couldn't validate the identity of the API Server: expected a 32 byte SHA-256 hash, found 31 bytes To see the stack trace of this error execute with --v=5 or higher [root@node1 ~]# kubeadm join 192.168.136.201:6443 --token 17wwni.taqxzqa3our1wh92 --discovery-token-ca-cert-hash sha256:1472821b3c34f13bc5d7264a737739e9854195b1856a00d2256c79d25118b2e9 W1011 04:44:08.357838 18781 join.go:346] [preflight] WARNING: JoinControlPane.controlPlane settings will be ignored when control-plane flag is not set. [preflight] 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 Hostname]: hostname "node1" could not be reached [WARNING Hostname]: hostname "node1": lookup node1 on 8.8.8.8:53: no such host [preflight] Reading configuration from the cluster... [preflight] FYI: You can look at this config file with 'kubectl -n kube-system get cm kubeadm-config -oyaml' [kubelet-start] Downloading configuration for the kubelet from the "kubelet-config-1.18" ConfigMap in the kube-system namespace [kubelet-start] Writing kubelet configuration to file "/var/lib/kubelet/config.yaml" [kubelet-start] Writing kubelet environment file with flags to file "/var/lib/kubelet/kubeadm-flags.env" [kubelet-start] Starting the kubelet [kubelet-start] Waiting for the kubelet to perform the TLS Bootstrap... This node has joined the cluster: * Certificate signing request was sent to apiserver and a response was received. * The Kubelet was informed of the new secure connection details. Run 'kubectl get nodes' on the control-plane to see this node join the cluster.
添加成功
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