Verifying the installation
Check the status of the DaemonSet and verify that all desired instances are in “ready” state:
$ kubectl --namespace kube-system get ds NAME DESIRED CURRENT READY NODE-SELECTOR AGE cilium 1 1 0 <none> 3s
In this example, we see a desired state of 1 with 0 being ready. This indicates
a problem. The next step is to list all cilium pods by matching on the label
k8s-app=cilium and also sort the list by the restart count of each pod to
easily identify the failing pods:
$ kubectl --namespace kube-system get pods --selector k8s-app=cilium \ --sort-by='.status.containerStatuses.restartCount' NAME READY STATUS RESTARTS AGE cilium-813gf 0/1 CrashLoopBackOff 2 44s
cilium-813gf is failing and has already been restarted 2 times. Let’s
print the logfile of that pod to investigate the cause:
$ kubectl --namespace kube-system logs cilium-813gf INFO _ _ _ INFO ___|_| |_|_ _ _____ INFO | _| | | | | | | INFO |___|_|_|_|___|_|_|_| INFO Cilium 0.8.90 f022e2f Thu, 27 Apr 2017 23:17:56 -0700 go version go1.7.5 linux/amd64 CRIT kernel version: NOT OK: minimal supported kernel version is >= 4.8
In this example, the cause for the failure is a Linux kernel running on the worker node which is not meeting System Requirements.
If the cause for the problem is not apparent based on these simple steps, please come and seek help on our Slack channel.
Apiserver outside of cluster
If you are running Kubernetes Apiserver outside of your cluster for some reason (like keeping master nodes behind a firewall), make sure that you run Cilium on master nodes too. Otherwise Kubernetes pod proxies created by Apiserver will not be able to route to pod IPs and you may encounter errors when trying to proxy traffic to pods.