1.12. Configuring image streams for a disconnected cluster
After installing OpenShift Container Platform in a disconnected environment, configure the image streams for the Cluster Samples Operator and the must-gather image stream.
1.12.1. Using Cluster Samples Operator image streams with alternate or mirrored registries
Most image streams in the openshift namespace managed by the Cluster Samples Operator point to images located in the Red Hat registry at registry.redhat.io. Mirroring will not apply to these image streams.
The jenkins, jenkins-agent-maven, and jenkins-agent-nodejs image streams come from the install payload and are managed by the Samples Operator, so no further mirroring procedures are needed for those image streams.
Setting the samplesRegistry field in the Sample Operator configuration file to registry.redhat.io is redundant because it is already directed to registry.redhat.io for everything but Jenkins images and image streams.
The cli, installer, must-gather, and tests image streams, while part of the install payload, are not managed by the Cluster Samples Operator. These are not addressed in this procedure.
Prerequisites
-
Access to the cluster as a user with the
cluster-adminrole. - Create a pull secret for your mirror registry.
Procedure
Access the images of a specific image stream to mirror, for example:
$ oc get is <imagestream> -n openshift -o json | jq .spec.tags[].from.name | grep registry.redhat.io
Mirror images from registry.redhat.io associated with any image streams you need in the restricted network environment into one of the defined mirrors, for example:
$ oc image mirror registry.redhat.io/rhscl/ruby-25-rhel7:latest ${MIRROR_ADDR}/rhscl/ruby-25-rhel7:latestCreate the cluster’s image configuration object:
$ oc create configmap registry-config --from-file=${MIRROR_ADDR_HOSTNAME}..5000=$path/ca.crt -n openshift-configAdd the required trusted CAs for the mirror in the cluster’s image configuration object:
$ oc patch image.config.openshift.io/cluster --patch '{"spec":{"additionalTrustedCA":{"name":"registry-config"}}}' --type=mergeUpdate the
samplesRegistryfield in the Cluster Samples Operator configuration object to contain thehostnameportion of the mirror location defined in the mirror configuration:$ oc edit configs.samples.operator.openshift.io -n openshift-cluster-samples-operator
注意This is required because the image stream import process does not use the mirror or search mechanism at this time.
Add any image streams that are not mirrored into the
skippedImagestreamsfield of the Cluster Samples Operator configuration object. Or if you do not want to support any of the sample image streams, set the Cluster Samples Operator toRemovedin the Cluster Samples Operator configuration object.注意Any unmirrored image streams that are not skipped, or if the Samples Operator is not changed to
Removed, will result in the Samples Operator reporting aDegradedstatus two hours after the image stream imports start failing.Many of the templates in the
openshiftnamespace reference the image streams. So usingRemovedto purge both the image streams and templates will eliminate the possibility of attempts to use them if they are not functional because of any missing image streams.
1.12.2. Preparing your cluster to gather support data
Clusters using a restricted network must import the default must-gather image in order to gather debugging data for Red Hat support. The must-gather image is not imported by default, and clusters on a restricted network do not have access to the internet to pull the latest image from a remote repository.
Procedure
If you have not added your mirror registry’s trusted CA to your cluster’s image configuration object as part of the Cluster Samples Operator configuration, perform the following steps:
Create the cluster’s image configuration object:
$ oc create configmap registry-config --from-file=${MIRROR_ADDR_HOSTNAME}..5000=$path/ca.crt -n openshift-configAdd the required trusted CAs for the mirror in the cluster’s image configuration object:
$ oc patch image.config.openshift.io/cluster --patch '{"spec":{"additionalTrustedCA":{"name":"registry-config"}}}' --type=merge
Import the default must-gather image from your installation payload:
$ oc import-image is/must-gather -n openshift
When running the oc adm must-gather command, use the --image flag and point to the payload image, as in the following example:
$ oc adm must-gather --image=$(oc adm release info --image-for must-gather)
