pod-io-stress

Generates disk I/O load inside the pod's cgroup, testing how your app handles slow storage and I/O saturation.

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

Parameters

Name	Type	Required	Default	Description
workers	string	No	"1"	Number of I/O stress worker threads
size	string	No	"1g"	Total I/O size per worker
duration	string	No	experiment duration	How long to run stress

Example

apiVersion: chaos.chaosplane.io/v1alpha1
kind: ChaosExperiment
metadata:
  name: pod-io-stress-example
  namespace: default
spec:
  target:
    kind: Pod
    namespace: default
    labelSelector:
      matchLabels:
        app: postgres
  action:
    type: pod-io-stress
    parameters:
      workers: "4"
      size: "2g"
      duration: "30s"
  duration: 30s
  rollback:
    enabled: true

Rollback behavior

Sends CancelChaos RPC to the daemon, which terminates the stress-ng I/O workers.

Implementation notes

The daemon runs stress-ng --io N --hdd-bytes SIZE inside the pod's cgroup namespace. I/O is performed on the pod's writable layer. This can fill up ephemeral storage if size is set too high — use with caution on pods with resources.limits.ephemeral-storage.