Kubernetes: High CPU usage
I am using Rancher. I have deployed a cluster with 1 master & 3 worker nodes. All Machines are VPSes with 2 vCPU, 8GB RAM and 80GB SSD.
After the cluster was set up, the CPU reserved figure on Rancher dashboard was 15%. After metrics were enabled, I could see CPU used figures too and now CPU reserved had become 44% and CPU used was 16%. I find those figures too high. Is it normal for Kubernetes a cluster to consume this much CPU by itself?
Drilling down into the metrics, if find that the networking solution that Rancher uses - Canal - consumes almost 10% of CPU resources. Is this normal?
Rancher v2.3.0 User Interface v2.3.15 Helm v2.10.0-rancher12 Machine v0.15.0-rancher12-1
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1 Answer
This "issue" is known for some time now and it affects smaller clusters. Kuberenetes is very CPU hungry relative to small clusters and this is currently by design. I have found multiple threads reporting this for different kind of setups. Here is an example.
So the short answer is: yes, Kubernetes setup consumes these amounts of CPU when used with relative small clusters.
I hope it helps.