node-cpu-stress

Runs CPU stress workers on the node host (not inside a pod cgroup). Tests how node-level CPU saturation affects all workloads on that node.

Target kind: Node
Implementation: Daemon (ExecStressChaos with stressorType: cpu)
Rollback: Yes — sends CancelChaos to terminate stress-ng

Parameters

Name	Type	Required	Default	Description
workers	string	No	"1"	Number of CPU stress worker threads
load	string	No	"100"	Target CPU load percentage (0-100)
duration	string	No	experiment duration	How long to run stress

Example

apiVersion: chaos.chaosplane.io/v1alpha1
kind: ChaosExperiment
metadata:
  name: node-cpu-stress-example
  namespace: chaosplane
spec:
  target:
    kind: Node
    labelSelector:
      matchLabels:
        node-role.kubernetes.io/worker: ""
  action:
    type: node-cpu-stress
    parameters:
      workers: "4"
      load: "90"
      duration: "60s"
  duration: 60s
  rollback:
    enabled: true

Rollback behavior

Sends CancelChaos RPC to the daemon, which terminates the stress-ng process.

Implementation notes

Unlike pod-cpu-stress, this runs at the node level and is not scoped to a pod's cgroup. All pods on the node compete for the remaining CPU. The daemon runs stress-ng --cpu N --cpu-load LOAD directly on the host. The operator tracks execution IDs per experiment UID to support concurrent experiments on the same node.