Crontab

The crontab trigger allows you to define a cron expression to schedule the image refresh.

The cron expression is a string representing a set of times, using 6 fields separated by white spaces. The fields represent:

1. Seconds (0-59)
2. Minutes (0-59)
3. Hours (0-23)
4. Day of month (1-31)
5. Month (1-12)
6. Day of week (0-6) (Sunday to Saturday)

* is a wildcard character that matches all values.

Examples:

• 00 00 */12 * * * will trigger the image every 12 hours.
• 00 00 00 * * * will trigger the image every day at midnight.
• 00 00 00 1 * * will trigger the image every first day of the month at midnight.
• 00 00 00 * * 1 will trigger the image every Monday at midnight.

Who to use

Create an Image resource with the crontab trigger.

Every 12 hours the image will execute rule defined in the rules section.

apiVersion: kimup.cloudavenue.io/v1alpha1
kind: Image
metadata:
  labels:
    app.kubernetes.io/managed-by: kustomize
  name: demo
spec:
  image: registry.127.0.0.1.nip.io/demo
  baseTag: v0.0.4
  triggers:
    - type: crontab
      value: "00 00 */12 * * *"
  rules:
    - [...]