kubernetes cron runs when node pools are scaled

Asked May 16 '23 at 08:03

Active May 17 '23 at 06:11

Viewed 63 times

I have created kubernetes cron job to perform a scheduled task and it runs periodically at the scheduled time. But it also runs when the node pools are scaled up.

Node pools are scaled down one by one everyday night and scaled up in the morning. Auto scaling is disabled when scaling down and enabled when scaling up. When scaling up, cron job runs and executes the scheduled task which is not scheduled at that time.

cron yaml -

apiVersion: batch/v1
kind: CronJob
metadata:
  name: app-cron
  labels:
    run: app-cron
spec:
  schedule: "1 0 * * *"
  concurrencyPolicy: Forbid
  successfulJobsHistoryLimit: 0
  failedJobsHistoryLimit: 1
  jobTemplate:
    spec:
      backoffLimit: 3
      template:
        spec:
          containers:
            - name: app-cron
              image: curlimages/curl
              command: [ "curl", "$(SERVICE_HOST_KEY)" ]
              env:
                - name: SERVICE_HOST_KEY
                  valueFrom:
                    configMapKeyRef:
                      name: cron-config
                      key: SERVICE_HOST
          restartPolicy: OnFailure

How can I stop running cron at the node pool scaling up time ?

edited May 17 '23 at 06:11

asked May 16 '23 at 08:03

Nivetha

Do you have a [mcve]? I'd be surprised if a Kubernetes CronJob decided to run whenever new nodes are added (if your environment uses the cluster autoscaler this could happen pretty routinely). – David Maze May 16 '23 at 10:55
Please, add your Kubernetes configuration files. – Alez May 16 '23 at 11:05
@Alez updated with cron yaml – Nivetha May 17 '23 at 06:08
@DavidMaze Auto-scaling is enabled when scaling up the node-pools. Can we fix it by adding any configuration to cron config. – Nivetha May 17 '23 at 06:13
We also need the autoscaler configuration – Alez May 17 '23 at 06:38

kubernetes cron runs when node pools are scaled

0 Answers0