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Edit and update chaos experiments

You can edit an existing chaos experiment to update the experiment's metadata, faults, schedule, etc. This section describes three actions:

  1. Editing an experiment
  2. Update old experiment manifests
  3. Bulk updating cron schedules

Edit a chaos experiment​

Described below are the steps to edit a chaos experiment.

Step 1: Click Edit experiment​

On the Chaos Experiments page, select the ⋮ icon against the name of the experiment you want to edit and select Edit Experiment.

Edit Experiment

Step 2: Make changes and save​

You can either update the changes to the same experiment and save it or create a copy of the experiment and then apply the changes to it.

save

Execute experiment with advanced options​

You can execute the chaos experiment with advanced security options: runAsUser or runAsGroup. Both the options allow privileged or restricted access to experiment pods.

  1. runAsUser: Specifies the user ID used to start all the processes in the experiment pod containers. Default user ID is 1000.

  2. runAsGroup: Specifies the group ID used to start all the processes in the experiment pod containers. Default group ID is 0.

To select one of the options,

Step 1: Navigate to your experiment​

  • Click Experiment builder tab. Click Advanced Options on the right side of the screen.

    run as user group

Step 2: Select the option and save​

  • Click Security tab and select/unselect one or both the options.

    advanced

Step 3: Save the changes​

  • Click Save.

    save changes

Update old experiment manifests​

When you upgrade the chaos infrastructure, you also need to update the images in the experiment manifest (YAML file) corresponding to the updated chaos infrastructure. The upgraded images should match the images in the Enterprise ChaosHub.

Which image version should you use?​

To determine the latest version of images, navigate to Enterprise Chaos Hub, and search for chaos-go-runner. The value associated with chaos-go-runner in the manifest in Enterprise Chaos Hub is the latest version.

navigate

To update the experiment manifest, follow the steps below.

Step 1: Navigate to Chaos Experiments page and select experiment​

  • Select the experiment whose manifest you wish to update, and click the Experiment Builder tab.

    select

Step 2: Click YAML to edit​

  • The VISUAL is usually displayed, click the YAML to edit it. Click Edit Yaml.

    save

    save

Step 3: Search instances of chaos-go-runner​

  • Find chaos-go-runner in the manifest and replace the corresponding version with the latest version.

    save

Step 4: Click Save​

  • Once you update the images, click Save at the top right.

    save

tip

When you create a new experiment, the images in the experiment manifest are configured to match the images in the Enterprise Chaos Hub.

The steps mentioned earlier will update the experiment manifests to match the version in the Enterprise Chaos Hub.

Bulk update cron schedules​

You can update multiple cron-scheduled chaos experiments in one go. One important aspect is that you can bulk update multiple cron schedules to a single value, that is, the cron schedules you select to update will all update to a single common value. You can't map different cron schedules to their respective values while performing a bulk update. You can:

  1. Bulk disable active schedules
  2. Bulk enable inactive cron schedules
  3. Bulk stop running experiments

To enable/disable a cron schedule,

Step 1: Click Bulk update​

Once you click Bulk update at the top right of the Chaos Experiments page, you will see two options:

  1. Reschedule cron
  2. Enable/disable cron

Select one of the above based on your requirements.

bulk update

tip

You can bulk update (reschedule or enable/disable) not more than 20 experiments in one go.

Step 2: Select experiments​

Select one or more experiments that you wish to reschedule or enable/disable.

click next

Step 3: Perform the bulk update on selected experiments​

Based on your choice between rescheduling or enabling (or disabling) a cron schedule, you will see one of the screens.

You can change the schedule of the experiments by changing the values, and click Confirm.

reschedule

Step 4: Click close​

You will see a confirmation message on your screen about the updated schedule. Click Close.

close