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Node IO Stress Experiment

This experiment causes IO stress on the Kubernetes node. The experiment aims to verify the resiliency of applications that share this disk resource for ephemeral or persistent storage purposes. . Check node io stress docs for more info. To know more and get started with chaos-actions visit github-chaos-actions.

Sample workflow

A Sample workflow to run node-io-stress experiment:

.github/workflows/push.yml

name: CI
on:
  push:
    branches: [ master ]
jobs:
  build:

    runs-on: ubuntu-latest
    steps:
    - name: Running node-io-stress chaos experiment
      uses: litmuschaos/github-chaos-actions@v0.4.0
      env:
        KUBE_CONFIG_DATA: ${{ secrets.KUBE_CONFIG_DATA }}
        ##if litmus is not installed
        INSTALL_LITMUS: true
        ##Give application info under chaos
        APP_NS: default
        APP_LABEL: run=nginx
        APP_KIND: deployment
        EXPERIMENT_NAME: node-io-stress
        ##Custom images can also be used
        EXPERIMENT_IMAGE: litmuschaos/go-runner
        EXPERIMENT_IMAGE_TAG: latest
        IMAGE_PULL_POLICY: Always
        TOTAL_CHAOS_DURATION: 120
        FILESYSTEM_UTILIZATION_PERCENTAGE: 10
        ##Select true if you want to uninstall litmus after chaos
        LITMUS_CLEANUP: true

Environment Variabels

The target node for node-io-stress will be identified with the app info variables.

Supported Chaos Action Tunables

Variables Description Specify In Chaos Action Default Value
EXPERIMENT_NAME For Running node io stress experiment keep it node-io-stress Mandatory No default value
FILESYSTEM_UTILIZATION_PERCENTAGE The size as percent of total available filesystem space (in percentage) Optional Default value is 10
TOTAL_CHAOS_DURATION The time duration for chaos injection (seconds) Optional Default value is 120s
APP_NS Provide namespace of application under chaos Optional Default value is default
APP_LABEL Provide application label of application under chaos. Optional Default value is run=nginx
APP_KIND Provide the kind of application Optional Default value is deployment
INSTALL_LITMUS Keep it true to install litmus if litmus is not already installed. Optional Default value is not set to true
LITMUS_CLEANUP Keep it true to uninstall litmus after chaos Optional Default value is not set to true
EXPERIMENT_IMAGE We can provide custom image for running chaos experiment Optional Default value is litmuschaos/go-runner
EXPERIMENT_IMAGE_TAG We can set the image tag while using custom image for the chaos experiment Optional Default value is latest
IMAGE_PULL_POLICY We can set the image pull policy while using custom image for running chaos experiment Optional Default value is Always