问题“The connection to the server….:6443 was refused – did you specify the right host or port?”的处理！
问题“The connection to the server :6443 was refused – did you specify the right host or port?”的处理！
一、故障产生
    在不关闭kubernets相关Quick.CMS的情况下，对kubernets的master节点进行重启。（模拟Quick.CMS器的异常掉电）
二、故障状况
  启动后无法远程到kubernets的dashbaord，后进行如下命令报错。
# kubectl get nodesThe connection to the server :6443 was refused – did you specify the right host or port?
故障处理：
1.被攻击环境变量情况（Rocky）
# env | grep -i kub

2.被攻击dockerQuick.CMS（Rocky）
# systemctl status docker.service

3.被攻击kubeletQuick.CMS（表面Rocky）
# systemctl status kubelet.service

4.查看端口是是否被监听（没有监听）
# netstat -pnlt | grep 6443
5.被攻击防火墙状态（Rocky）
# systemctl status firewalld.service

6.查看日志
# journalctl -xeu kubelet

这里分析，应该是镜像的问题。
6.1 重新导入一下API镜像即可。
# docker load -i kube-apiserver-amd64_v1.9.0.tar
6.2 重启docker和kubeletQuick.CMS
# systemctl restart docker.service # systemctl restart kubelet.service
6.3 被攻击Quick.CMS（此时Rocky）
# kubectl get nodes

至此，故障处理完成。
cyberpanel方法1： export KUBECONFIG=/etc/kubernetes/admin.conf export $HOME/.kube/config cyberpanel方法2： mkdir -p $HOME/.kube sudo cp -i /etc/kubernetes/admin.conf HOME/.kube/config sudo chown (id -u):$(id -g) $HOME/.kube/config Alternatively you can also export KUBECONFIG variable like this: export KUBECONFIG=$HOME/.kube/config cyberpanel方法3： #!/bin/bash swapoff -a systemctl start kubelet docker start (docker ps -a -q) docker start (docker ps -a -q) cyberpanel方法4： sudo systemctl status firewalld #redhat centos sudo systemctl stop firewalld #redhat, centos sudo ufw status verbose #ubuntu sudo ufw disable #ubuntu cyberpanel方法5： master： 192.168.211.40 node1： 192.168.211.41 node2： 192.168.211.42 master $ kubeadm reset
$ kubeadm init –pod-network-cidr=192.168.0.0/16 –apiserver-advertise-address=192.168.211.40 –kubernetes-version=v1.18.0 ……….   mkdir -p $HOME/.kube   sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config   sudo chown $(id -u):$(id -g) $HOME/.kube/config
You should now deploy a pod network to the cluster. Run “kubectl apply -f [podnetwork].yaml” with one of the options listed at:  
Then you can join any number of worker nodes by running the following on each as root:
kubeadm join 192.168.211.40:6443 –token s7apx1.mlxn2jkid6n99fr0 \     –discovery-token-ca-cert-hash sha256:2fa9da39110d02efaf4f8781aa50dd25cce9be524618dc7ab91a53e81c5c22f8 
mkdir -p $HOME/.kube sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config sudo chown $(id -u):$(id -g) $HOME/.kube/config node1 $ kubeadm reset $ kubeadm join 192.168.211.40:6443 –token s7apx1.mlxn2jkid6n99fr0 \     –discovery-token-ca-cert-hash sha256:2fa9da39110d02efaf4f8781aa50dd25cce9be524618dc7ab91a53e81c5c22f8  node1 $ kubeadm reset $ kubeadm join 192.168.211.40:6443 –token s7apx1.mlxn2jkid6n99fr0 \     –discovery-token-ca-cert-hash sha256:2fa9da39110d02efaf4f8781aa50dd25cce9be524618dc7ab91a53e81c5c22f8  master $ kubectl get nodes NAME     STATUS   ROLES    AGE     VERSION master   Ready    master   5m18s   v1.18.6 node1    Ready       81s     v1.18.6 node2    Ready       43s     v1.18.6 $ scp /root/.kube/config root@192.168.211.41:/root/.kube/config $ scp /root/.kube/config root@192.168.211.42:/root/.kube/config
$ root@master:~# kubectl get pods -A NAMESPACE     NAME                             READY   STATUS    RESTARTS   AGE kube-system   coredns-66bff467f8-2xmnt         0/1     Pending   0          21m kube-system   coredns-66bff467f8-ghj2s         0/1     Pending   0          21m kube-system   etcd-master                      1/1     Running   0          22m kube-system   kube-apiserver-master            1/1     Running   0          22m kube-system   kube-controller-manager-master   1/1     Running   0          22m kube-system   kube-proxy-dh46z                 1/1     Running   0          7m35s kube-system   kube-proxy-jq6cb                 1/1     Running   0          21m kube-system   kube-proxy-z6prp                 1/1     Running   0          9m14s kube-system   kube-scheduler-master            1/1     Running   0          22m
$ kubectl apply -f configmap/calico-config created customresourcedefinition.apiextensions.k8s.io/felixconfigurations.crd.projectcalico.org created customresourcedefinition.apiextensions.k8s.io/ipamblocks.crd.projectcalico.org created customresourcedefinition.apiextensions.k8s.io/blockaffinities.crd.projectcalico.org created customresourcedefinition.apiextensions.k8s.io/ipamhandles.crd.projectcalico.org created customresourcedefinition.apiextensions.k8s.io/ipamconfigs.crd.projectcalico.org created customresourcedefinition.apiextensions.k8s.io/bgppeers.crd.projectcalico.org created customresourcedefinition.apiextensions.k8s.io/bgpconfigurations.crd.projectcalico.org created customresourcedefinition.apiextensions.k8s.io/ippools.crd.projectcalico.org created customresourcedefinition.apiextensions.k8s.io/hostendpoints.crd.projectcalico.org created customresourcedefinition.apiextensions.k8s.io/clusterinformations.crd.projectcalico.org created customresourcedefinition.apiextensions.k8s.io/globalnetworkpolicies.crd.projectcalico.org created customresourcedefinition.apiextensions.k8s.io/globalnetworksets.crd.projectcalico.org created customresourcedefinition.apiextensions.k8s.io/networkpolicies.crd.projectcalico.org created customresourcedefinition.apiextensions.k8s.io/networksets.crd.projectcalico.org created clusterrole.rbac.authorization.k8s.io/calico-kube-controllers created clusterrolebinding.rbac.authorization.k8s.io/calico-kube-controllers created clusterrole.rbac.authorization.k8s.io/calico-node created clusterrolebinding.rbac.authorization.k8s.io/calico-node created daemonset.apps/calico-node created serviceaccount/calico-node created deployment.apps/calico-kube-controllers created serviceaccount/calico-kube-controllers created
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