Kubelet和control plane版本不对应：
[ERROR KubeletVersion]: the kubelet version is higher than the control plane version. This is not a supported version skew and may lead to a malfunctional cluster. Kubelet version: "1.19.4" Control plane version: "1.18.6"解决：
#卸载重装对应的低版本 yum -y remove kubelet yum -y install kubelet-1.18.6 kubeadm-1.18.6
master节点初始化之后执行 kubectl cluster-info 显示Unable to connect to the server:
Unable to connect to the server: x509: certificate signed by unknown authority (possibly because of "crypto/rsa: verification error" while trying to verify candidate authority certificate "kubernetes")
原因：
Kebeadm init之后不删除元来文件并又新生成$HOME/.kube，重复了。要删干净文件后重新初始化。解决：
#master节点执行： rm -rf $HOME/.kube #删掉所有文件 #重新执行生成文档： mkdir -p $HOME/.kube sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config sudo chown $(id -u):$(id -g) $HOME/.kube/config kubectl cluster-info
master节点：执行 kubectl get cs 显示unhealthy。变成healthy
步骤：
kubectl get cs
解决：
#改配置文件 #Master节点修改： #vi /etc/kubernetes/manifests/kube-controller-manager.yaml /etc/kubernetes/manifests/kube-scheduler.yaml #两个文件都注释掉--port=0这个设置
worker节点：The connection to the server localhost:8080 was refused - did you specify the right host or port?
[root@localhost kubelet.service.d]# kubectl get nodes W1116 20:29:22.881159 20594 loader.go:223] Config not found: /etc/kubernetes/admin.conf The connection to the server localhost:8080 was refused - did you specify the right host or port?
解决：
#Master节点执行：
scp /etc/kubernetes/admin.conf [email protected]:/etc/kubernetes/admin.conf
#Node节点执行：
echo "export KUBECONFIG=/etc/kubernetes/admin.conf" >> ~/.bash_profile
source ~/.bash_profile
worker节点：不显示节点名称；两个节点名称一样只显示一个
解决：
hostnamectl set-hostname node2 hostname
重置kubeadm初始化/配置
Kubeadm reset rm -rf /var/lib/cni/ /var/lib/etcd/ rm -rf /var/lib/kubelet /etc/kubernetes/ 重新kubeadm init 和kubeadm join
worker节点执行 kubectl get nodes显示Not ready。变成ready：解决：
#Master和worker节点执行： vi /var/lib/kubelet/kubeadm-flags.env：将“--network-plugin=cni”删掉 #重启： systemctl daemon-reload systemctl restart kubelet
kubeadm init初始化报错，无法拉取镜像：[ERROR ImagePull]: failed to pull image registry.aliyuncs.com/google_containers/coredns/coredns:v1.8.0
解决：
docker pull registry.aliyuncs.com/google_containers/coredns:1.8.0 docker tag registry.aliyuncs.com/google_containers/coredns:v1.8.0 registry.aliyuncs.com/google_containers/coredns/coredns:v1.8.0 docker rmi registry.aliyuncs.com/google_containers/coredns:1.8.0
原文链接：http://www.shanhubei.com/archives/2596.html