We are running Kubernetes with the following configuration: On-premise Kubernetes 1.11.3, cri-o 1.11.6 and CentOS7 with UEK-4.14.35
I can't make crictl stats to return pods information, it returns empty list only. Has anyone run into the same problem?
Another issue we have, is that when I query the kubelet for stats/summary it returns an empty pods list.
I think that these two issues are related, although I am not sure which one of them is the problem.
I would recommend checking kubelet service to verify health status and debug any suspicious events within the cluster. I assume that CRI-O runtime engine can select kubelet as the main Pods information provider because of its managing Pod lifecycle role.
systemctl status kubelet -l
journalctl -u kubeletIn case you found some errors or dubious events, share it in a comment below this answer.
However, you can use metrics-server, which will collect Pod metrics in the cluster and enable kube-apiserver flags for Aggregation Layer. Here is a good article about Horizontal Pod Autoscaling and monitoring resources via Prometheus.