Openshift Container Platform has nice feature called Image Streams which aggregates all tags of container image in single object. This makes it easier to reference images from other configuration objects in Openshift i.e. Deployment Configs. Other nice feature of Image Steams is that you can schedule automatic updates of existing and new tags from Image Stream sourcing image registry. In order to make your Image Stream schedulable for updates you need to add --scheduled=true parameter to oc import-image command which creates new Image Stream from existing container image:
oc import-image ruby --from=registry.redhat.io/rhscl/ruby-25-rhel7 --confirm --all --scheduled=true
Image Streams update scheduler is enabled by default and is configured in master-config.yaml in imagePolicyConfig section:
imagePolicyConfig:
MaxScheduledImageImportsPerMinute: 10
ScheduledImageImportMinimumIntervalSeconds: 1800
disableScheduledImport: false
maxImagesBulkImportedPerRepository: 3
You can adjust this configuration according to your needs but first remember to refer Openshift docs and restart master api and controller processes after you made any changes.
