coredns 部分pod启动失败

查看现象及日志

[root@k8s-master ~]# kubectl get pod -n kube-system 
NAME                                 READY   STATUS    RESTARTS   AGE
coredns-59c7994f5d-87gq7             0/1     Running   2          4m5s
coredns-59c7994f5d-db78l             1/1     Running   0          4m5s
etcd-k8s-master                      1/1     Running   9          274d
kube-apiserver-k8s-master            1/1     Running   11         2y121d
kube-controller-manager-k8s-master   1/1     Running   4          2y121d
kube-flannel-ds-amd64-77q6m          1/1     Running   0          3m58s
kube-flannel-ds-amd64-fdjgm          1/1     Running   0          3m18s
kube-flannel-ds-amd64-jrvjr          1/1     Running   0          2m41s
kube-proxy-n7qqj                     1/1     Running   0          4m18s

[root@k8s-master ~]# kubectl -n kube-system logs coredns-59c7994f5d-87gq7 
E0824 05:26:56.720802       1 reflector.go:153] pkg/mod/k8s.io/client-go@v0.17.2/tools/cache/reflector.go:105: Failed to list *v1.Endpoints: Get https://10.96.0.1:443/api/v1/endpoints?limit=500&resourceVersion=0: dial tcp 10.96.0.1:443: connect: no route to host
E0824 05:26:56.720843       1 reflector.go:153] pkg/mod/k8s.io/client-go@v0.17.2/tools/cache/reflector.go:105: 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
E0824 05:26:56.720971       1 reflector.go:153] pkg/mod/k8s.io/client-go@v0.17.2/tools/cache/reflector.go:105: Failed to list *v1.Namespace: Get https://10.96.0.1:443/api/v1/namespaces?limit=500&resourceVersion=0: dial tcp 10.96.0.1:443: connect: no route to host
.:53
[INFO] plugin/reload: Running configuration MD5 = 4e235fcc3696966e76816bcd9034ebc7
CoreDNS-1.6.7
linux/amd64, go1.13.6, da7f65b
E0824 05:26:59.792027       1 reflector.go:153] pkg/mod/k8s.io/client-go@v0.17.2/tools/cache/reflector.go:105: 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
E0824 05:26:59.792049       1 reflector.go:153] pkg/mod/k8s.io/client-go@v0.17.2/tools/cache/reflector.go:105: Failed to list *v1.Namespace: Get https://10.96.0.1:443/api/v1/namespaces?limit=500&resourceVersion=0: dial tcp 10.96.0.1:443: connect: no route to host
E0824 05:26:59.792290       1 reflector.go:153] pkg/mod/k8s.io/client-go@v0.17.2/tools/cache/reflector.go:105: Failed to list *v1.Endpoints: Get https://10.96.0.1:443/api/v1/endpoints?limit=500&resourceVersion=0: dial tcp 10.96.0.1:443: connect: no route to host
E0824 05:27:02.864586       1 reflector.go:153] pkg/mod/k8s.io/client-go@v0.17.2/tools/cache/reflector.go:105: Failed to list *v1.Endpoints: Get https://10.96.0.1:443/api/v1/endpoints?limit

关键报错

Failed to list *v1.Endpoints: Get https://10.96.0.1:443/api/v1/endpoints?limit=500&resourceVersion=0: dial tcp 10.96.0.1:443: connect: no route to host

路由问题导致：iptables -L

解决方法

# 先缩减
kubectl scale --replicas=0  deploy/coredns -n kube-system
# 再增加
kubectl scale --replicas=2  deploy/coredns -n kube-system

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