mborne/crash-test

A buggy application to illustrate Docker and Kubernetes features (mainly auto-restart and limits) :

Parameters

Name	Description	Default
APP_PORT	Listening port	3000
APP_COLOR	A color to illustrates env vars handling and blue/green deployments	null
LOG_FORMAT	Log format to illustrate JSON parsing ("simple" or "json")	"simple"
LOG_LEVEL	Log level ("debug", "verbose", "info", "warn", "error")	"info"

Usage

Usage with docker

See compose.yml :

# start on http://localhost:3000
docker compose up -d --build

# simulate crash 
curl -X POST http://localhost:3000/api/bug/crash

# simulate memory leak
while true; do curl -X POST -sS http://localhost:3000/api/bug/memory-leak ; echo; sleep 1; done

Kubernetes usage

In one terminal :

# deploy
kubectl -k manifests
# To watch pods restarts :
watch kubectl get pods -o wide
# To watch pods CPU / RAM :
watch kubectl top pods

In another terminal :

# create temp pod
kubectl run terminal  --rm -it  --image=ghcr.io/mborne/terminal:latest --restart=Never -- /bin/sh

# get metadata
curl -sS http://debug/api/metadata | jq

# crash random pod
curl -X POST -sS http://debug/api/bug/crash | jq
# simulate memory leak
while true; do curl -X POST -sS http://debug/api/bug/memory-leak | jq ; sleep 5; done

Local usage

# install stress-ng
sudo apt-get update
sudo apt-get install -y stress-ng

# install dependencies
npm install
# start on http://localhost:3000
npm run start

License

MIT