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diff --git a/health/guides/cgroups/k8s_cgroup_10min_cpu_usage.md b/health/guides/cgroups/k8s_cgroup_10min_cpu_usage.md new file mode 100644 index 00000000..3168e279 --- /dev/null +++ b/health/guides/cgroups/k8s_cgroup_10min_cpu_usage.md @@ -0,0 +1,48 @@ +### Understand the alert + +This alert calculates the average `cgroup CPU utilization` over the past 10 minutes in a Kubernetes cluster. If you receive this alert at the warning or critical levels, it means that your cgroup is heavily utilizing the available CPU resources. + +### What does cgroup CPU utilization mean? + +In Kubernetes, `cgroups` are a Linux kernel feature that helps to limit and isolate the resource usage (CPU, memory, disk I/O, etc.) of a collection of processes. The `cgroup CPU utilization` measures the percentage of available CPU resources consumed by the processes within a cgroup. + +### Troubleshoot the alert + +- Identify the over-utilizing cgroup + +Check the alert message for the specific cgroup that is causing high CPU utilization. + +- Determine the processes utilizing the most CPU resources in the cgroup + +To find the processes within the cgroup with high CPU usage, you can use `systemd-cgtop` on the Kubernetes nodes: + +``` +systemd-cgtop -m -1 -p -n10 +``` + +- Analyze the Kubernetes resource usage + +Use `kubectl top` to get an overview of the resource usage in your Kubernetes cluster: + +``` +kubectl top nodes +kubectl top pods +``` + +- Investigate the Kubernetes events and logs + +Examine the events and logs of the Kubernetes cluster and the specific resources that are causing the high CPU utilization. + +``` +kubectl get events --sort-by='.metadata.creationTimestamp' +kubectl logs <pod-name> -n <namespace> --timestamps -f +``` + +- Optimize the resource usage of the cluster + +You may need to scale your cluster by adding more resources, adjusting the resource limits, or optimizing the application code to minimize CPU usage. + +### Useful resources + +1. [Overview of a Pod](https://kubernetes.io/docs/concepts/workloads/pods/) +2. [Assign CPU Resources to Containers and Pods](https://kubernetes.io/docs/tasks/configure-pod-container/assign-cpu-resource/) |