Pod Chaos Monkey

Deletes a randomly chosen pod from a kubernetes cluster's namespace

Pre-requisites

• a Kubernetes cluster
  • Alternately install KinD (https://kind.sigs.k8s.io/docs/user/quick-start#installation) and kind create cluster
• Helm
  • Install Helm (https://helm.sh/docs/intro/install/)
• A reliable application in workloads namespace
  • start a nginx deployment with kubectl -n workloads create deployment nginx --image=nginx --port=80 --replicas=2

Installation

• Build image with docker build -t pod-chaos-monkey:latest .

• Push it to your registry, or if you're using KinD, load image into the cluster with kind load docker-image pod-chaos-monkey:latest

• Now you're ready to deploy with helm upgrade -i pod-chaos-monkey chart/. -f helm-values.yaml (change the .image.repository value if using a remote registry)

To change helm release values, check the available values here

Here's the main application options:

Key	Type	Default	Description
args.loglevel	string	"info"	log verbosity
args.namespace	string	"workloads"	watched namespace
args.sleep	string	"30"	sleep time between pod deletions

Run tests and linter

Tests

• Install pytest in your virtualenv with pip install pytest
• Run tests with PYTHONPATH=./app pytest

Linter

• nstall pylint in your virtualenv with pip install pylint
• Run linter with PYTHONPATH=./app pylint app

Future Improvements

1. run test and linter in CI
2. add a kubernetes event every time the monkey deletes a pod