init_container_kubernetes.yaml

apiVersion: batch/v1beta1
kind: CronJob
metadata:
  name: example
  namespace: default
spec:
  schedule: '*/1 * * * *'
  jobTemplate:
    spec:
      template:
        spec:
          initContainers:
            - name: wait-for-service
              image: busybox
              command: ['sh', '-c', 'until nslookup myservice; do echo waiting for myservice; sleep 2; done']
            - name: wait-for-db
              image: postgres
              command: ['pg_isready', '-h', 'someremotehost']
            - name: clean-up-db
              image: busybox
              command: ['sh', '-c', 'psql -f clean_up.psql']
          containers:
            - name: fake-job
              image: own-image
              command: ['sh', '-c', 'echo The app is running! && sleep 3600']
          restartPolicy: OnFailure