cron-nsupdate-ddns.yaml

apiVersion: batch/v1
kind: CronJob
metadata:
  name: cron-nsupdate-ddns
  namespace: cron
spec:
  schedule: "* * * * *"
  concurrencyPolicy: Forbid
  jobTemplate:
    spec:
      ttlSecondsAfterFinished: 300
      template:
        spec:
          volumes:
            - name: ddns-key
              secret:
                secretName: ddns-key
          containers:
          - name: nsupdate-ddns
            image: registerserver.example.com:5000/cron-nsupdate-ddns:1.0.1
            imagePullPolicy: IfNotPresent
            env:
            - name: SERVER
              value: "yourdnsserver.example.com"
            - name: ZONE
              value: "dynzone.example.com"
            - name: HOST
              value: "hostname"
            - name: KEY
              value: "/mnt/ddns-key"
            volumeMounts:
              - name: ddns-key
                mountPath: /mnt/ddns-key
                subPath: ddns-key
          restartPolicy: Never