Create random Kubernetes deployments

create-workloads.sh

#!/bin/bash

set -o pipefail

# total amount of pods to create
TOTAL=${1:-500}
# deploy size
export BATCH=${2:-100}
export NAMESPACE=${KUBE_NAMESPACE:-default}

CPU_OPTIONS=(250m 500m 750m 1 2)
#MEM_OPTIONS=(128M 256M 512M 1G 2G)
MEM_OPTIONS=(512M 750M 1G 1500M 2G)

CPU_OPTIONS_LENG=${#CPU_OPTIONS[@]}
MEM_OPTIONS_LENG=${#MEM_OPTIONS[@]}

COUNT=0
while (test $COUNT -lt $TOTAL); do
	RAND=$(cat /dev/urandom | tr -dc 'a-z0-9' | fold -w 5 | head -n 1)
	export CPU=${CPU_OPTIONS[$[$RANDOM % $CPU_OPTIONS_LENG]]}
	export MEM=${MEM_OPTIONS[$[$RANDOM % $MEM_OPTIONS_LENG]]}
	export NAME="batch-${CPU,,}-${MEM,,}-${RAND}"
	echo "Creating ${NAME} with ${BATCH} replicas"
	cat deployment-template.yaml \
		| envsubst \
		| kubectl apply -n ${NAMESPACE} -f -
	COUNT=$((COUNT+$BATCH))
done

delete-workloads.sh

#!/bin/bash

set -eo pipefail

kubectl get deploy \
	| grep batch \
	| awk '{print $1}' \
	| xargs kubectl delete deploy 

deployment-template.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: "${NAME}"
spec:
  replicas: ${BATCH}
  selector:
    matchLabels:
      app: "${NAME}"
  template:
    metadata:
      labels:
        app: "${NAME}"
    spec:
      containers:
      - image: public.ecr.aws/jg/curlit:latest
        name: "${NAME}"
        resources:
          requests:
            cpu: "${CPU}"
            memory: "${MEM}"
      tolerations:
      - key: karpenter
        operator: Exists
      nodeSelector:
        kubernetes.io/arch: amd64