Navigating Image Pull Issues in Restricted Network Environments: Workaround for "Manifest Unknown" Error on OpenShift Cluster

Solution Verified - Updated -

Issue

  • Encountering Image Pull Failure with Specific SHA256 Digest on RedHat Registry

  • Event logs indicate a failure in pulling an image, despite the presence of the original image with the specified SHA256 Digest on the RH registry.

Failed attempt to pull image "registry.redhat.io/openshift-service-mesh/istio-rhel8-operator@sha256:XXXXXXXXXX": rpc error: code = Unknown desc = (Mirrors also failed: [mirror.reg.example.com:5000/openshift-service-mesh/istio-rhel8-operator@sha256:XXXXXXXXXX: Error reading manifest sha256:XXXXXXXXXX in mirror.reg.example.com:5000/openshift-service-mesh/istio-rhel8-operator: manifest unknown: manifest unknown]): registry.redhat.io/openshift-service-mesh/istio-rhel8-operator@sha256:XXXXXXXXXX: error pinging docker registry registry.redhat.io: Get https://registry.redhat.io/v2/: dial tcp x.x.x.x:443: i/o timeout

Error: ErrImagePull
Back-off pulling image "registry.redhat.io/openshift-service-mesh/istio-rhel8-operator@sha256:XXXXXXXXXX"

Environment

  • Red Hat OpenShift Container Platform 4.x

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