docker – CoreDNS无法在Kubernetes集群中运行

我正在尝试设置Kubernetes集群,但我无法运行CoreDNS.我运行了以下命令来启动集群：

sudo swapoff -a
sudo sysctl net.bridge.bridge-nf-call-iptables=1
sudo kubeadm init

mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config

kubectl apply -f "https://cloud.weave.works/k8s/net?k8s- version=$(kubectl version | base64 | tr -d 'n')"
kubectl apply -f https://raw.githubusercontent.com/kubernetes/dashboard/master/src/deploy/recommended/kubernetes-dashboard.yaml

要检查带有kubectl的POD获取pods –all-namespaces,我得到了

NAMESPACE     NAME                                    READY   STATUS             RESTARTS   AGE
kube-system   coredns-68fb79bcf6-6s5bp                0/1     CrashLoopBackOff   6          10m
kube-system   coredns-68fb79bcf6-hckxq                0/1     CrashLoopBackOff   6          10m
kube-system   etcd-myserver                           1/1     Running            0          79m
kube-system   kube-apiserver-myserver                 1/1     Running            0          79m
kube-system   kube-controller-manager-myserver        1/1     Running            0          79m
kube-system   kube-proxy-9ls64                        1/1     Running            0          80m
kube-system   kube-scheduler-myserver                 1/1     Running            0          79m
kube-system   kubernetes-dashboard-77fd78f978-tqt8m   1/1     Running            0          80m
kube-system   weave-net-zmhwg                         2/2     Running            0          80m

所以CoreDNS不断崩溃.我能找到的唯一错误消息来自
在/ var / log / syslog的：

Oct  4 18:06:44 myserver kubelet[16397]: E1004 18:06:44.961409   16397 pod_workers.go:186] Error syncing pod c456a48b-c7c3-11e8-bf23-02426706c77f ("coredns-68fb79bcf6-6s5bp_kube-system(c456a48b-c7c3-11e8-bf23-02426706c77f)"),skipping: failed to "StartContainer" for "coredns" with CrashLoopBackOff: "Back-off 5m0s restarting failed container=coredns pod=coredns-68fb79bcf6-6s5bp_kube-system(c456a48b-c7c3-11e8-bf23-02426706c77f)"

来自kubectl logs coredns-68fb79bcf6-6s5bp -n kube-system：

.:53
2018/10/04 11:04:55 [INFO] CoreDNS-1.2.2
2018/10/04 11:04:55 [INFO] linux/amd64,go1.11,eb51e8b
CoreDNS-1.2.2
linux/amd64,eb51e8b
2018/10/04 11:04:55 [INFO] plugin/reload: Running configuration MD5 = f65c4821c8a9b7b5eb30fa4fbc167769
2018/10/04 11:04:55 [FATAL] plugin/loop: Seen "HINFO IN 3256902131464476443.1309143030470211725." more than twice,loop detected

我发现的一些解决方案是要发布的

kubectl -n kube-system get deployment coredns -o yaml | 
sed 's/allowPrivilegeEscalation: false/allowPrivilegeEscalation: true/g' | 
kubectl apply -f -

并修改/etc/resolv.conf指向实际的DNS,而不是localhost,我也尝试过.

该问题在https://kubernetes.io/docs/setup/independent/troubleshooting-kubeadm/#pods-in-runcontainererror-crashloopbackoff-or-error-state中描述,我尝试了许多不同的Pod网络但没有帮助.

我已经运行了sudo kubeadm reset&& rm -rf~ / .kube /&& sudo kubeadm init几次.

我正在运行Ubuntu 16.04,Kubernetes 1.12和Docker 17.03.有任何想法吗？