Hoping someone can help. I have a 3x node CoreOS cluster running Kubernetes. The nodes are as follows: 192.168.1.201 - Controller 192.168.1.202 - Worker Node 192.168.1.203 - Worker Node
The cluster is up and running, and I can run the following commands:
> kubectl get nodes
NAME STATUS AGE
192.168.1.201 Ready,SchedulingDisabled 1d
192.168.1.202 Ready 21h
192.168.1.203 Ready 21h
> kubectl get pods --namespace=kube-system
NAME READY STATUS RESTARTS AGE
kube-apiserver-192.168.1.201 1/1 Running 2 1d
kube-controller-manager-192.168.1.201 1/1 Running 4 1d
kube-dns-v20-h4w7m 2/3 CrashLoopBackOff 15 23m
kube-proxy-192.168.1.201 1/1 Running 2 1d
kube-proxy-192.168.1.202 1/1 Running 1 21h
kube-proxy-192.168.1.203 1/1 Running 1 21h
kube-scheduler-192.168.1.201 1/1 Running 4 1d
As you can see, the kube-dns service is not running correctly. It keeps restarting and I am struggling to understand why. Any help in debugging this would be greatly appreciated (or pointers at where to read about debugging this. Running kubectl logs does not bring anything back...not sure if the addons function differently to standard pods.
Running a kubectl describe pods, I can see the containers are killed due to being unhealthy:
16m 16m 1 {kubelet 192.168.1.203} spec.containers{kubedns} Normal Created Created container with docker id 189afaa1eb0d; Security:[seccomp=unconfined]
16m 16m 1 {kubelet 192.168.1.203} spec.containers{kubedns} Normal Started Started container with docker id 189afaa1eb0d
14m 14m 1 {kubelet 192.168.1.203} spec.containers{kubedns} Normal Killing Killing container with docker id 189afaa1eb0d: pod "kube-dns-v20-h4w7m_kube-system(3a545c95-ea19-11e6-aa7c-52540021bfab)" container "kubedns" is unhealthy, it will be killed and re-created
Please find a full output of this command as a github gist here: https://gist.github.com/mehstg/0b8016f5398a8781c3ade8cf49c02680
Thanks in advance!
