节点kubeadm join 时发现kubelet启动失败，no route to host 清除iptables规则，关闭防火墙即可

2023-08-01 01:59| 来源: 网络整理| 查看: 265

kubeadm join 10.40.19.85:6443 --token 8g02qu.h37najizohm2hi5s --discovery-token-ca-cert-hash sha256:22a48d5cd38c60e4103c1a449dd684247186fba4d4b939f0332eebf31b441952 [preflight] Running pre-flight checks ---没有反应--- 查看日志 [root@uat-n1 kube]# journalctl -f -u kubelet -- Logs begin at Fri 2019-12-13 04:22:52 CST. -- Dec 13 05:24:41 uat-n1 systemd[1]: Unit kubelet.service entered failed state. Dec 13 05:24:41 uat-n1 systemd[1]: kubelet.service failed. Dec 13 05:24:51 uat-n1 systemd[1]: kubelet.service holdoff time over, scheduling restart. Dec 13 05:24:51 uat-n1 systemd[1]: Stopped kubelet: The Kubernetes Node Agent. Dec 13 05:24:51 uat-n1 systemd[1]: Started kubelet: The Kubernetes Node Agent. Dec 13 05:24:54 uat-n1 kubelet[16121]: F1213 05:24:54.254563 16121 server.go:193] failed to load Kubelet config file /var/lib/kubelet/config.yaml, error failed to read kubelet config file "/var/lib/kubelet/config.yaml", error: open /var/lib/kubelet/config.yaml: no such file or directory Dec 13 05:24:54 uat-n1 systemd[1]: kubelet.service: main process exited, code=exited, status=255/n/a

查看master，发现coredns没有running起来

[root@uat-m ttebdadmin]# kubectl get pods -o wide -A -w NAMESPACE NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES kube-system coredns-fb8b8dccf-28xlr 0/1 CrashLoopBackOff 2 12h 10.244.0.2 uat-m kube-system coredns-fb8b8dccf-7v88v 0/1 CrashLoopBackOff 1 12h 10.244.0.3 uat-m kube-system etcd-uat-m 1/1 Running 2 12h 10.40.19.85 uat-m kube-system kube-apiserver-uat-m 1/1 Running 2 12h 10.40.19.85 uat-m kube-system kube-controller-manager-uat-m 1/1 Running 2 12h 10.40.19.85 uat-m kube-system kube-flannel-ds-amd64-hmwdm 1/1 Running 0 78s 10.40.19.85 uat-m kube-system kube-proxy-ddppl 1/1 Running 2 12h 10.40.19.85 uat-m kube-system kube-scheduler-uat-m 1/1 Running 2 12h 10.40.19.85 uat-m ^C[root@uat-m ttebdadmin]# kubectl logs -n kube-system coredns-fb8b8dccf-28xlr E1213 13:27:24.280028 1 reflector.go:134] github.com/coredns/coredns/plugin/kubernetes/controller.go:317: Failed to list *v1.Endpoints: Get https://10.1.0.1:443/api/v1/endpoints?limit=500&resourceVersion=0: dial tcp 10.1.0.1:443: connect: no route to host E1213 13:27:24.280028 1 reflector.go:134] github.com/coredns/coredns/plugin/kubernetes/controller.go:317: Failed to list *v1.Endpoints: Get https://10.1.0.1:443/api/v1/endpoints?limit=500&resourceVersion=0: dial tcp 10.1.0.1:443: connect: no route to host log: exiting because of error: log: cannot create log: open /tmp/coredns.coredns-fb8b8dccf-28xlr.unknownuser.log.ERROR.20191213-132724.1: no such file or directory

发现错误是connect: no route to host

清除iptables规则即可在master上运行

systemctl stop kubelet systemctl stop docker iptables --flush iptables -tnat --flush systemctl start kubelet systemctl start docker

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