Kubernetes Error: coredns – no route to host log & Failed to list & CrashLoopBackOff

Errors

[verizon@raj-laptop ~]$ kubectl get pods -A
NAMESPACE     NAME                                 READY   STATUS             RESTARTS   AGE
kube-system   coredns-fb8b8dccf-scdx4              0/1     Error              3          4m44s
kube-system   coredns-fb8b8dccf-sfwgd              0/1     CrashLoopBackOff   3          4m44s
kube-system   etcd-raj-laptop                      1/1     Running            0          3m49s
kube-system   kube-apiserver-raj-laptop            1/1     Running            0          3m36s
kube-system   kube-controller-manager-raj-laptop   1/1     Running            0          3m37s
kube-system   kube-proxy-vkdfh                     1/1     Running            0          4m44s
kube-system   kube-scheduler-raj-laptop            1/1     Running            0          3m30s
kube-system   weave-net-ftxrg                      2/2     Running            0          82s

[verizon@raj-laptop ~]$ kubectl logs coredns-fb8b8dccf-sfwgd -n=kube-system
E0613 16:18:10.815705       1 reflector.go:134] github.com/coredns/coredns/plugin/kubernetes/controller.go:315: Failed to list *v1.Service: Get https://10.96.0.1:443/api/v1/services?limit=500&resourceVersion=0: dial tcp 10.96.0.1:443: connect: no route to host
E0613 16:18:10.815705       1 reflector.go:134] github.com/coredns/coredns/plugin/kubernetes/controller.go:315: Failed to list *v1.Service: Get https://10.96.0.1:443/api/v1/services?limit=500&resourceVersion=0: dial tcp 10.96.0.1:443: connect: no route to host
log: exiting because of error: log: cannot create log: open /tmp/coredns.coredns-fb8b8dccf-sfwgd.unknownuser.log.ERROR.20190613-161810.1: no such file or directoryCode language: JavaScript (javascript)

Solutions

systemctl disable firewalld
systemctl stop firewalld
systemctl reboot
systemctl stop kubelet
systemctl stop docker

iptables -P FORWARD ACCEPT
iptables -P INPUT ACCEPT
iptables -P OUTPUT ACCEPT
ip6tables -t nat -F
ip6tables -t mangle -F
ip6tables -F
ip6tables -X
ip6tables -P INPUT ACCEPT
ip6tables -P FORWARD ACCEPT
ip6tables -P OUTPUT ACCEPT


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

Rajesh Kumar

I’m Rajesh Kumar, a DevOps, SRE, DevSecOps, Cloud, and Platform Engineering expert passionate about sharing practical knowledge, real-world experiences, and industry best practices. I have worked at Cotocus and regularly write about technology, travel, investing, health, product reviews, and digital marketing through my various platforms.

I publish technical articles at DevOps School, travel stories at Holiday Landmark, stock market insights at Stocks Mantra, health and fitness guidance at My Medic Plus, product reviews at TrueReviewNow, and SEO and digital marketing strategies at Wizbrand.