継続的に更新
1.マスターホストの再起動後のポート6443の問題（sawpoffの問題）
[root@k8s-master ~]# kubectl get node
The connection to the server 10.0.0.80:6443 was refused - did you specify the right host or port?
# 通过 systemctl status kubelet.service 查看状态
[root@k8s-master ~]systemctl status kubelet.service
● kubelet.service - kubelet: The Kubernetes Node Agent
Loaded: loaded (/usr/lib/systemd/system/kubelet.service; enabled; vendor preset: disabled)
Drop-In: /usr/lib/systemd/system/kubelet.service.d
└─10-kubeadm.conf
Active: activating (auto-restart) (Result: exit-code) since Tue 2020-12-08 22:19:05 CST; 6s ago
Docs: https://kubernetes.io/docs/
Process: 1949 ExecStart=/usr/bin/kubelet $KUBELET_KUBECONFIG_ARGS $KUBELET_CONFIG_ARGS $KUBELET_KUBEADM_ARGS $KUBELET_EXTRA_ARGS (code=exited, status=255)
Main PID: 1949 (code=exited, status=255) # 这里出现错误
#关闭swapoff分区关闭 重启即可
swapoff -a
systemctl restart kubelet.service
次に、ノードマシンは切断後にマスターに参加できません
swapoff -a # 关闭分区 保险起见 如果分区了的话
kubeadm reset # 重新配置
kubeadm join.... # 重新生成token加入即可
3つ目は、kube-system（名前空間）のノードを表示する
ここで主に使用されます
kubectl get pods -n kube-system # 查看 kube-system(命名空间)中的节点
--------------------------------------------------------------------
NAME READY STATUS RESTARTS AGE
coredns-7dcc599b9f-gt4lz 1/1 Running 2 24h
coredns-7dcc599b9f-psxlg 1/1 Running 2 24h
etcd-k8s-master 1/1 Running 2 24h
kube-apiserver-k8s-master 1/1 Running 2 24h
kube-controller-manager-k8s-master 1/1 Running 2 24h
kube-flannel-ds-bkvp4 1/1 Running 0 3h15m
kube-flannel-ds-mwrf6 1/1 Running 2 24h
kube-flannel-ds-s46tm 1/1 Running 1 23h
kube-proxy-b4g6t 1/1 Running 1 23h
kube-proxy-nc2kz 1/1 Running 0 3h15m
kube-proxy-qxx5l 1/1 Running 2 24h
kube-scheduler-k8s-master 1/1 Running 2 24h
# 如果重启次数过多 代表有问题
kubectl get pods -n kube-system -o wide
--------------------------------------------------------------------
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
coredns-7dcc599b9f-gt4lz 1/1 Running 2 24h 10.244.0.10 k8s-master <none> <none>
coredns-7dcc599b9f-psxlg 1/1 Running 2 24h 10.244.0.8 k8s-master <none> <none>
etcd-k8s-master 1/1 Running 2 24h 10.0.0.80 k8s-master <none> <none>
kube-apiserver-k8s-master 1/1 Running 2 24h 10.0.0.80 k8s-master <none> <none>
kube-controller-manager-k8s-master 1/1 Running 2 24h 10.0.0.80 k8s-master <none> <none>
kube-flannel-ds-bkvp4 1/1 Running 0 3h17m 10.0.0.81 k8s-node-01 <none> <none>
kube-flannel-ds-mwrf6 1/1 Running 2 24h 10.0.0.80 k8s-master <none> <none>
kube-flannel-ds-s46tm 1/1 Running 1 24h 10.0.0.82 k8s-node-02 <none> <none>
kube-proxy-b4g6t 1/1 Running 1 24h 10.0.0.82 k8s-node-02 <none> <none>
kube-proxy-nc2kz 1/1 Running 0 3h17m 10.0.0.81 k8s-node-01 <none> <none>
kube-proxy-qxx5l 1/1 Running 2 24h 10.0.0.80 k8s-master <none> <none>
kube-scheduler-k8s-master 1/1 Running 2 24h 10.0.0.80 k8s-master
# 地址不一致往往时 /etc/hosts 问题没对应
