Cron job for triggering the autoscaler

cronautoscaler.yaml

kind: Role
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  namespace: production
  name: cron-runner
rules:
- apiGroups: ["autoscaling"]
  resources: ["horizontalpodautoscalers"]
  verbs: ["patch", "get"]

---
kind: RoleBinding
apiVersion: rbac.authorization.k8s.io/v1beta1
metadata:
  name: cron-runner
  namespace: production
subjects:
- kind: ServiceAccount
  name: sa-cron-runner
  namespace: production
roleRef:
  kind: Role
  name: cron-runner
  apiGroup: rbac.authorization.k8s.io

---
apiVersion: v1
kind: ServiceAccount
metadata:
  name: sa-cron-runner
  namespace: production
---

apiVersion: batch/v1beta1
kind: CronJob
metadata:
  name: django-scale-up-job
  namespace: production
spec:
  schedule: "56 11 * * 1-6"
  successfulJobsHistoryLimit: 0 # Remove after successful completion
  failedJobsHistoryLimit: 1 # Retain failed so that we see it
  concurrencyPolicy: Forbid
  jobTemplate:
    spec:
      template:
        spec:
          serviceAccountName: sa-cron-runner
          containers:
          - name: django-scale-up-job
            image: bitnami/kubectl:latest
            command:
            - /bin/sh
            - -c
            - kubectl patch hpa myapp-web --patch '{"spec":{"minReplicas":8}}'
          restartPolicy: OnFailure
----
apiVersion: batch/v1beta1
kind: CronJob
metadata:
  name: django-scale-down-job
  namespace: production
spec:
  schedule: "30 20 * * 1-6"
  concurrencyPolicy: Forbid
  successfulJobsHistoryLimit: 0 # Remove after successful completion
  failedJobsHistoryLimit: 1 # Retain failed so that we see it
  jobTemplate:
    spec:
      template:
        spec:
          serviceAccountName: sa-cron-runner
          containers:
          - name: django-scale-down-job
            image: bitnami/kubectl:latest
            command:
            - /bin/sh
            - -c
            - kubectl patch hpa myapp-web --patch '{"spec":{"minReplicas":5}}'
          restartPolicy: OnFailure