Delete oldest pod k8s cronJob

pod-deleter.yaml

apiVersion: batch/v1beta1
kind: CronJob
metadata:
  name: your-cron
spec:
  schedule: "0 0 */2 * *"
  concurrencyPolicy: Forbid
  jobTemplate:
    spec:
      template:
        metadata:
          labels:
            app: memoryLeak
        spec:
          containers:
          - name: kubectl
            image: bitnami/kubectl:1.11
            imagePullPolicy: IfNotPresent
            command: ["/bin/sh"]
            args: ["-c", "kubectl delete pod $(kubectl get pod -l app=redis --sort-by=.metadata.creationTimestamp -o custom-columns=:metadata.name| tail -1)"]
            securityContext:
              privileged: false
              allowPrivilegeEscalation: false
          restartPolicy: OnFailure
          serviceAccountName: pod-deleter-sa

---
kind: Role
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: pod-delete
  namespace: default
  labels:
    app: memoryLeak
rules:
- apiGroups: [""]
  resources: ["pods"]
  verbs: ["delete", "get", "list"]

---
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
  name: pod-delete-binding
  namespace: default
  labels:
    app: memoryLeak
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: Role
  name: pod-delete
subjects:
- kind: ServiceAccount
  name: pod-deleter-sa
  namespace: default

---
apiVersion: v1
kind: ServiceAccount
metadata:
  name: pod-deleter-sa
  namespace: default
  labels:
    app: memoryLeak