oc-mirror v2 process fails with an error when two EUS channels are specified in the ImageSetConfig

Solution Verified - Updated -

Environment

  • Red Hat OpenShift Container Platform (RHOCP)
    • 4.14
  • Disconnected Environment

Issue

  • Including two EUS channels in the ImageSetConfig causes the oc-mirror v2 process to generate results but also triggers an error:
[ERROR]  : get release images: error list error calculating cross channel upgrades: failed to get upgrade graph: NoVersionsFound: no cluster versions found for "amd64" in the "eus-4.15" channel

Resolution

  • Red Hat is aware of this issue and it is currently tracked in Bug.
  • As an workaround, split the ImageSetConfiguration file into two parts.
  • First iteration using the following ImageSetConfiguration:
kind: ImageSetConfiguration
apiVersion: mirror.openshift.io/v2alpha1
mirror:
  platform:
    channels:
    - name: eus-4.14
      minVersion: 4.14.12
      maxVersion: 4.14.40
      shortestPath: true
  • Then execute the mirror-to-disk and disk-to-mirror workflow.
  • Second iteration using the following ImageSetConfiguration:
kind: ImageSetConfiguration
apiVersion: mirror.openshift.io/v2alpha1
mirror:
  platform:
    channels:
    - name: eus-4.16
      minVersion: 4.15.38
      maxVersion: 4.16.23
      shortestPath: true
    graph: true
  • Execute the same workflow mirror-to-disk and disk-to-mirror.

Root Cause

The primary purpose of the EUS channels is to serve as a convenience for clusters performing a Control Plane Only update. The EUS channel only applies to even numbered minor version so eus-4.15 is not supported.

Diagnostic Steps

  • Create the ImageSetConfiguration file as per the Red Hat documentations for oc-mirror v2 including two EUS channels 4.14 and 4.16:
kind: ImageSetConfiguration
apiVersion: mirror.openshift.io/v2alpha1
mirror:
  platform:
    channels:
    - name: eus-4.14
      minVersion: 4.14.12
      maxVersion: 4.14.40
      shortestPath: true
    - name: eus-4.16
      minVersion: 4.15.38
      maxVersion: 4.16.23
      shortestPath: true
    graph: true
  • Mirror the images from the specified ImageSetConfiguration by running the following command:
$ oc-mirror --config=imageset-config.yaml docker://<registry> --v2 --workspace file:///home/oc-mirror
[ERROR]  : get release images: error list error calculating cross channel upgrades: failed to get upgrade graph: NoVersionsFound: no cluster versions found for "amd64" in the "eus-4.15" channel

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