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Disk Fill Experiment

This chaos action causes Disk Stress by filling up the Ephemeral Storage of the Pod using one of it containers. It forced the Pod to get Evicted if the Pod exceeds it Ephemeral Storage Limit.It tests the Ephemeral Storage Limits, to ensure those parameters are sufficient. Check disk fill docs for more info. To know more and get started with chaos-actions visit github-chaos-actions.

NOTE: Appropriate Ephemeral Storage Requests and Limits should be set for the application before running the chaos action.

Sample workflow

A Sample workflow to run disk-fill experiment:

.github/workflows/main.yml

name: CI

on:
  push:
    branches: [ master ]

jobs:
  build:

    runs-on: ubuntu-latest
    steps:
    - name: Running disk-fill 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: disk-fill
        FILL_PERCENTAGE: 80
        TARGET_CONTAINER: nginx
        ##Custom images can also be used
        EXPERIMENT_IMAGE: litmuschaos/go-runner
        EXPERIMENT_IMAGE_TAG: latest
        IMAGE_PULL_POLICY: Always
        ##Select true if you want to uninstall litmus after chaos
        LITMUS_CLEANUP: true

Environment Variabels

The application pod for disk-fill will be identified with the app info variables.

Supported Chaos Action Tunables

Variables Description Specify In Chaos Action Default Value
EXPERIMENT_NAME For Running disk fill experiment keep it disk-fill Mandatory No default value
TARGET_CONTAINER Name of container which is subjected to disk-fill Optional Default value is nginx
FILL_PERCENTAGE Percentage to fill the Ephemeral storage limit Optional Default value is 2
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