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https://github.com/tmobile/chaostoolkit-turbulence

Tools and resources to support Chaos Engineering
https://github.com/tmobile/chaostoolkit-turbulence

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Tools and resources to support Chaos Engineering

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# chaostoolkit-turbulence



This is an extension for [Chaos Toolkit](https://chaostoolkit.org/) which adds support for

[Turbulence](https://github.com/cppforlife/turbulence-release) attacks.



## Setup



### Install

To be used from your experiment, this package must first be installed in the Python environment where

[chaostoolkit](https://chaostoolkit.org/) already exists. This package requires at least

[Python](https://www.python.org/) version 3.5, so translate `python` as `python3` or `pyhton3.5` as appropriate for your

operating system.



From within the source, run:  



```bash

sudo python setup.py install

```



Or to install for just your user:  



```bash

python setup.py install --user

```



Now you should be able to import the package.



```python

import chaosturbulence

print(chaosturbulence.__version__)

```



### Turbulence Deployment

Before this plugin can be used, you need to have [Turbulence](https://github.com/cppforlife/turbulence-release) deployed

in a [BOSH](https://github.com/cloudfoundry/bosh) environment and have the api accessible form your system. Once this is

ready, specify the needed information in the configuration section of the attack. See the

[docs](https://github.com/cppforlife/turbulence-release/blob/master/docs/config.md) for more information on

how to deploy Turbulence.



## Usage

If you have not installed the `chaosturbulence` package, then make sure you run Chaos Toolkit from this directory (the

root of this repository) using `pyhton -m chaostoolkit run exp.json` or else the `chaosturbulence` module will not be

found. Otherwise just use `chaos run exp.json` from any directory.



To use, you will need to specify in the configuration:



- `turb_api_url`: The URL of the Turbulence API which POST requests will be sent to. This should be in the form `https://user:password@address:port`.

- `turb_verify_ssl`: Whether the SSL certificate should be verified. It will default to `true`.

 

Then, to write an attack simply specify the task type and the selector to use. More information about the tasks and

selectors can be found in the

[Turbulence API docs](https://github.com/cppforlife/turbulence-release/blob/master/docs/api.md).



A sample experiment for Turbulence integration with Chaos Toolkit:



```json

{

    "version": "1.0.0",

    "title": "What is the impact of killing one random diego cell?",

    "description": "If a diego-cell dies, then it should be restarted automatically and any applications on it should be relocated temporarily",

    "tags": ["tls"],

    "steady-state-hypothesis": {

        "title": "Application responds",

        "probes": []

    },

	"configuration": {

		"turb_api_url": "https://turbulence:[email protected]:8080",

		"turb_verify_ssl": false

	},

    "method": [

        {

			"type": "action",

			"name": "terminate-diego-cells",

			"provider": {

				"type": "python",

				"module": "chaosturbulence.actions",

				"func": "attack",

				"arguments": {

					"task": { "Type": "Kill" },

					"selector": {

						"Deployment": {"Name": "cf"},

						"Group": {"Name": "diego-cell"},

						"ID": {"Limit": 1}

					}

				}

			}

		}

    ],

    "rollbacks": []

}

```



Because Turbulence has its own rollbacks setup based on the `timeout`, you may want to set

`"pauses": {"after": timeout}` where timeout is a number of seconds and pauses is a field in an action object. You can

read more in the [experiment documentation](https://docs.chaostoolkit.org/reference/api/experiment/#action).