autoscaler.yaml

apiVersion: "autoscaling.openshift.io/v1"
kind: "ClusterAutoscaler"
metadata:
  name: "default"
spec:
  podPriorityThreshold: -10
  resourceLimits:
    maxNodesTotal: 5
  scaleDown:
    enabled: true 
    delayAfterAdd: 10s
    unneededTime: 10s

Dockerfile

FROM docker.io/centos:centos8
RUN dnf install -y epel-release && dnf install -y stress && dnf clean all

machine_as.yaml

apiVersion: "autoscaling.openshift.io/v1beta1"
kind: "MachineAutoscaler"
metadata:
  name: "scale-automatic"
  namespace: "openshift-machine-api"
spec:
  minReplicas: 3
  maxReplicas: 5
  scaleTargetRef:
    apiVersion: machine.openshift.io/v1beta1
    kind: MachineSet
    name: ostest-wb5t4-worker-0

stress.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: stress-deployment
spec:
  selector:
    matchLabels:
      app: stress
  replicas: 2
  template:
    metadata:
      labels:
        app: stress
    spec:
        containers:
        - image: 'virthost.ostest.test.metalkube.org:5000/localimages/stress:latest'
          name: stress
          command:
            - stress
          args:
            - '--vm'
            - '1'
            - '--vm-bytes'
            - '6g'
          resources:
            requests:
              memory: "6500Mi"