Kubernetes kind: CronJob

Giriş

Açıklaması şöyle

spec > schedule: specify the cron expression for how frequently the container has to be invoked

containers > image: image name which was built in previous steps

successFulJobsHistoryLimit: keep the metadata related to the last ’n’ successful jobs for debugging or log monitoring

Örnek - veri tabanı yedekleme

Şöyle yaparız. 

schedule her gece çalışacağını belirtir

restartPolicy gerekirse tekrar başlayacağını belirtir

apiVersion: batch/v1
kind: CronJob
metadata:
  name: db-backup
spec:
  schedule: "0 0 * * *"
  jobTemplate:
    spec:
      template:
        spec:
          restartPolicy: OnFailure
          volumes:
          - name: backup-volume
            hostPath:
              path: /mnt/backup
          containers:
          - name: db-backup
            image: mysql:5.7
            args:
            - mysqldump
            - --host=<database host>
            - --user=root
            - --password=<database password>
            - --result-file=/mnt/backup/all-databases.sql
            - <database name>
            volumeMounts:
            - name: backup-volume
              mountPath: /mnt/backup

Örnek

Şöyle yaparız

apiVersion: batch/v1
kind: CronJob
metadata:
  name: reporting-job
spec:
  schedule: "0 8 * * *"
  successfulJobsHistoryLimit: 1
  failedJobsHistoryLimit: 5
  jobTemplate:
    spec:
      template:
        spec:
          containers:
            - name: reporting
              image: reportingservice:1.0.0
              imagePullPolicy: IfNotPresent
          restartPolicy: OnFailure

Şöyle yaparız

# get the cron job state
kubectl get cronjob

# for continuous monitoring
kubectl get jobs --watch

# to View logs 
# Replace "reporting-job-706356" with the job name in your system
pods=$(kubectl get pods \
  --selector=job-name=reporting-job-706356 \
  --output=jsonpath={.items[*].metadata.name})

kubectl logs $pods