在master2节点上查看：
[root@master2 flannel]# kubectl get nodes NAME STATUS ROLES AGE VERSION master1 Ready control-plane,master 10m v1.20.7 master2 Ready control-plane,master 79m v1.20.7 [root@master2 flannel]# kubectl get pods --all-namespaces NAMESPACE NAME READY STATUS RESTARTS AGE kube-system coredns-7f89b7bc75-qcwzx 1/1 Running 0 79m kube-system coredns-7f89b7bc75-w2x25 1/1 Running 0 79m kube-system etcd-master1 1/1 Running 0 11m kube-system etcd-master2 1/1 Running 0 79m kube-system kube-apiserver-master1 1/1 Running 0 11m kube-system kube-apiserver-master2 1/1 Running 0 79m kube-system kube-controller-manager-master1 1/1 Running 0 11m kube-system kube-controller-manager-master2 1/1 Running 1 79m kube-system kube-flannel-ds-hn8bc 1/1 Running 0 46m kube-system kube-flannel-ds-tf6kn 1/1 Running 0 11m kube-system kube-proxy-722xp 1/1 Running 0 79m kube-system kube-proxy-dxfdx 1/1 Running 0 11m kube-system kube-scheduler-master1 1/1 Running 0 11m kube-system kube-scheduler-master2 1/1 Running 1 79m 加入Kubernetes Node在node1上执行
向集群添加新节点，执行在kubeadm init输出的kubeadm join命令：
kubeadm join master.k8s.io:16443 --token utehrv.1bcxxsecjilacgf5 --discovery-token-ca-cert-hash sha256:7b34954f4a26987b9e56da871607a694581120142ae2814c313f50e9c77efc9d遇到的错误：
error execution phase preflight: couldn\'t validate the identity of the API Server: Get "https://master.k8s.io:16443/api/v1/namespaces/kube-public/configmaps/cluster-info?timeout=10s": dial tcp: lookup master.k8s.io on 100.100.2.138:53: no such host #得到token >kubeadm token create #得到discovery-token-ca-cert-hash > openssl x509 -pubkey -in /etc/kubernetes/pki/ca.crt | openssl rsa -pubin -outform der 2>/dev/null | openssl dgst -sha256 -hex | sed \'s/^.* //\' 也可以直接使用下面个命令，但是依然没有解决上面这个问题 # kubeadm token create --print-join-command遇到的问题：
[WARNING Hostname]: hostname "node1" could not be reached [WARNING Hostname]: hostname "node1": lookup node1 on 100.100.2.138:53: no such host解决办法：
遇到的错误：
[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/解决办法
mkdir /etc/docker # Setup daemon. cat > /etc/docker/daemon.json <<EOF { "exec-opts": ["native.cgroupdriver=systemd"], "log-driver": "json-file", "log-opts": { "max-size": "100m" }, "storage-driver": "overlay2", "storage-opts": [ "overlay2.override_kernel_check=true" ] } EOF mkdir -p /etc/systemd/system/docker.service.d # Restart Docker systemctl daemon-reload systemctl restart docker遇到的错误（从节点未能加入到Master节点里面，网上查找的方法也没能解决）：
[root@node1 ~]# kubeadm join master.k8s.io:16443 --token k5rf6v.ybl0dndn1l3xs5if --discovery-token-ca-cert-hash sha256:7b34954f4a26987b9e56da871607a694581120142ae2814c313f50e9c77efc9d [preflight] Running pre-flight checks [WARNING SystemVerification]: this Docker version is not on the list of validated versions: 20.10.7. Latest validated version: 19.03 error execution phase preflight: couldn\'t validate the identity of the API Server: Get "https://master.k8s.io:16443/api/v1/namespaces/kube-public/configmaps/cluster-info?timeout=10s": dial tcp: lookup master.k8s.io on 100.100.2.138:53: no such host To see the stack trace of this error execute with --v=5 or higher