I am deploying Kubernetes 1.4 on Ubuntu 16 on Raspberry Pi 3 following the instructions at http://kubernetes.io/docs/getting-started-guides/kubeadm/. The master starts and the minion joins no problem but when I add weave kubedns won't start. Here's the pods:
k8s@k8s-master:~$ kubectl get pods --all-namespaces
NAMESPACE NAME READY STATUS RESTARTS AGE
kube-system etcd-k8s-master 1/1 Running 1 23h
kube-system kube-apiserver-k8s-master 1/1 Running 3 23h
kube-system kube-controller-manager-k8s-master 1/1 Running 1 23h
kube-system kube-discovery-1943570393-ci2m9 1/1 Running 1 23h
kube-system kube-dns-4291873140-ia4y8 0/3 ContainerCreating 0 23h
kube-system kube-proxy-arm-nfvvy 1/1 Running 0 1h
kube-system kube-proxy-arm-tcnta 1/1 Running 1 23h
kube-system kube-scheduler-k8s-master 1/1 Running 1 23h
kube-system weave-net-4gqd1 0/2 CrashLoopBackOff 54 1h
kube-system weave-net-l758i 0/2 CrashLoopBackOff 44 1h
The events log doesn't show anything. getting logs for kube-dns doesn't get anything either.
What can I do to debug?
UPDATE: As Bryan pointed out, Flannel is not the only overlay network anymore.
Note this two hints in the kubeadm install documentation:
Flannel is the only network overlay support for arm
If you are on another architecture than amd64, you should use the flannel overlay network as described in the multi-platform section
When using Flannel, you need to make a kubectl init --por-network-cidr=10.244.0.0/16
Note: this will autodetect the network interface to advertise the master on as the interface with the default gateway. If you want to use a different interface, specify --api-advertise-addresses= argument to kubeadm init. If you want to use flannel as the pod network, specify --pod-network-cidr=10.244.0.0/16 if you’re using the daemonset manifest below. However, please note that this is not required for any other networks besides Flannel.
You may also would like to check my automated step-by-step installation for Raspberry Pi 3 with Ansible, since there is no issue with DNS and probably will work with Ubuntu 16 as well:
NAMESPACE NAME READY STATUS RESTARTS AGE
default busybox-894550917-7vj3z 1/1 Running 0 15h
default busybox-894550917-p9vnl 1/1 Running 1 3d
default gogs-3464422143-cf5wb 1/1 Running 0 16h
kube-system dummy-2501624643-pxmgz 1/1 Running 2 3d
kube-system etcd-master.cluster.local 1/1 Running 2 3d
kube-system kube-apiserver-master.cluster.local 1/1 Running 2 3d
kube-system kube-controller-manager-master.cluster.local 1/1 Running 2 3d
kube-system kube-discovery-1659614412-vrhv4 1/1 Running 2 3d
kube-system kube-dns-4211557627-kpsj4 4/4 Running 8 3d
kube-system kube-flannel-ds-d1bgg 2/2 Running 6 3d
kube-system kube-flannel-ds-fcp4b 2/2 Running 6 3d
kube-system kube-flannel-ds-n7p3m 2/2 Running 6 3d
kube-system kube-flannel-ds-tn7nd 2/2 Running 6 3d
kube-system kube-flannel-ds-vpk4w 2/2 Running 6 3d
kube-system kube-proxy-5nmtn 1/1 Running 2 3d
kube-system kube-proxy-gq7bz 1/1 Running 2 3d
kube-system kube-proxy-lkkgm 1/1 Running 2 3d
kube-system kube-proxy-mlh3v 1/1 Running 1 3d
kube-system kube-proxy-sg8n8 1/1 Running 2 3d
kube-system kube-scheduler-master.cluster.local 1/1 Running 2 3d
kube-system kubernetes-dashboard-3507263287-h9q33 1/1 Running 2 3d