How to schedule pods to restart using Kubernetes CronJob

@ZatoryPrivate

This is a filthy way to restart pods but sometimes we need to do filthy things.

As usual, this post will be short and useful ( i guess),
you required, some Kubernetes kinds:

• ServiceAccount, for set permissions to CronJob
• Role, to set verbs which you CronJob can use it
• RoleBinding, to create a relationship between role and ServiceAccount
• CronJob to restart your pod

# Create file cron-job.yaml
---
kind: ServiceAccount
apiVersion: v1
metadata:
  name: deleting-pods
  namespace: my-namespace

---
apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:
  name: deleting-pods
  namespace: my-namespace
rules:
  - apiGroups: [""]
    resources: ["pods"]
    verbs: ["get", "patch", "list", "watch", "delete"] 

---
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
  name: deleting-pods
  namespace: my-namespace
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: Role
  name: deleting-pods
subjects:
  - kind: ServiceAccount
    name: deleting-pods

---
apiVersion: batch/v1beta1
kind: CronJob
metadata:
  name: deleting-pod
  namespace: my-namespace
spec:
  concurrencyPolicy: Forbid
  schedule: "0 */1 * * *" # At minute 0 past every hour, chage it.
  jobTemplate:
    spec:
      backoffLimit: 2
      activeDeadlineSeconds: 600
      template:
        spec:
          serviceAccountName: deleting-pods 
          restartPolicy: Never
          containers:
            - name: kubectl
              image: bitnami/kubectl
              command:
                - 'kubectl'
                - 'delete'
                - 'pod'
                - 'my-pod'
                - '--force'
                - '--grace-period=0'
# kubectl apply -f cron-job.yaml
# kubectl get cronjob -n my-namespace

So, in my case, I have a statefulset but if you have a kind deployment, check the following link is more focused on kind deployment.

Cheers :)