OpenShift Container Platform

Using the container image pre-cache filter

The pre-cache feature typically downloads more images than a cluster needs for an update. You can control which pre-cache images are downloaded to a cluster. This decreases download time, and saves bandwidth and storage.

You can see a list of all images to be downloaded using the following command:

$ oc adm release info <ocp-version>

The following ConfigMap example shows how you can exclude images using the excludePrecachePatterns field.

apiVersion: v1
kind: ConfigMap
metadata:
  name: cluster-group-upgrade-overrides
data:
  excludePrecachePatterns: |
    azure
    aws
    vsphere
    alibaba

TALM excludes all images with names that include any of the patterns listed here.