Run scheduled task inside Pod in Kubernetes

Question

I have a small instance of influxdb running in my kubernetes cluster.
The data of that instance is stored in a persistent storage.
But I also want to run the backup command from influx at scheduled interval.

influxd backup -portable /backuppath

What I do now is exec into the pod and run it manually.
Is there a way that I can do this automatically?

Answer 1

This is the solution I have used for this question

apiVersion: v1
kind: ConfigMap
metadata:
  name: cm-backupscript
  namespace: influx
data:
  backupscript.sh: | 
    #!/bin/bash
    echo 'getting pod name'
    podName=$(kubectl get pods -n influx  --field-selector=status.phase==Running --output=jsonpath={.items..metadata.name})
    echo $podName
    #echo 'create backup'
    kubectl exec -it $podName -n influx -- /mnt/influxBackupScript/influxbackup.sh
    echo 'done'
---
apiVersion: batch/v1beta1
kind: CronJob
metadata:
  name: backup-cron
  namespace: influx
spec:
  schedule: "0 2 * * *"
  jobTemplate:
    spec:
      template:
        spec:
          affinity:
            nodeAffinity:
              requiredDuringSchedulingIgnoredDuringExecution:
                nodeSelectorTerms:
                - matchExpressions:
                  - key: kubernetes.io/arch
                    operator: In
                    values:
                    - amd64
          volumes:
          - name: backup-script
            configMap:
              name: cm-backupscript
              defaultMode: 0777
          containers:
          - name: kubectl
            image: bitnami/kubectl:latest
            command:
            - /bin/sh
            - -c
            - /mnt/scripts/backupscript.sh
            volumeMounts:
            - name: backup-script
              mountPath: "/mnt/scripts"
          restartPolicy: Never