kubeadm 1.6.0 I created pods network failed,kube-flannel CrashLoopBackOff

[xilu0]

hi,
I created the kubernetes cluster 1.6.0 by using kubeadm kubeadm init.

I created pods network failed,Previous steps are successful, I turn off selinux

[root@kube-master home]# kubectl get pods --all-namespaces NAMESPACE NAME READY STATUS RESTARTS AGE kube-system etcd-kube-master 1/1 Running 0 1h kube-system kube-apiserver-kube-master 1/1 Running 0 1h kube-system kube-controller-manager-kube-master 1/1 Running 0 1h kube-system kube-dns-3913472980-fzq6r 3/3 Running 0 1h **kube-system kube-flannel-ds-lqtz9 1/2 CrashLoopBackOff 19 1h** kube-system kube-proxy-c6rx2 1/1 Running 0 1h kube-system kube-scheduler-kube-master 1/1 Running 0 1h
I am getting error messages in /var/log/messages.
Apr 4 04:50:34 kube-master kubelet: I0404 04:50:34.631242 3880 kuberuntime_manager.go:752] Back-off 5m0s restarting failed container=kube-flannel pod=kube-flannel-ds-lqtz9_kube-system(878ce510-1909-11e7-a7cc-fa163e6824ce) Apr 4 04:50:34 kube-master kubelet: E0404 04:50:34.631294 3880 pod_workers.go:182] Error syncing pod 878ce510-1909-11e7-a7cc-fa163e6824ce ("kube-flannel-ds-lqtz9_kube-system(878ce510-1909-11e7-a7cc-fa163e6824ce)"), skipping: failed to "StartContainer" for "kube-flannel" with CrashLoopBackOff: "Back-off 5m0s restarting failed container=kube-flannel pod=kube-flannel-ds-lqtz9_kube-system(878ce510-1909-11e7-a7cc-fa163e6824ce)"

I am getting error messages in container.
E0404 08:42:23.017527 1 main.go:127] Failed to create SubnetManager: error retrieving pod spec for 'kube-system/kube-flannel-ds-wlr92': the server does not allow access to the requested resource (get pods kube-flannel-ds-wlr92)
Please take a look at
thank you !

[Sliim]

This look like a rbac permission error. See kubernetes/kubeadm#212 (comment)

[xilu0]

@Sliim you are right, it`s rbac permission error,
I will
kubectl create -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel-rbac.yml
thank you!

[vagharsh]

i have a CentOS 7 freshly installed i have updated the YUM repo and installed docker and k8s from the official guide i do a after creating these 3 pods
kubectl create -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel-rbac.yml
kubectl create -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml
kubectl create -f https://raw.githubusercontent.com/kubernetes/dashboard/master/src/deploy/kubernetes-dashboard.yaml
everything start's up and runs, but after i do a system reboot kube-flannel does not start with this error CrashLoopBackOff

where can i find more details on why its not starting ?

[SemenMartynov]

Hi @vagharsh

Try to re-enable and re-start docker -- in my case it helps!

$ systemctl enable docker && systemctl start docker
$ systemctl status kubelet

[vagharsh]

i added this to the docker start options and everything worked fine after it.
--exec-opt native.cgroupdriver=systemd