If you are using RHN Classic to manage a host, enable channels using the rhn-channel command. Replace repo-id in the following example with the relevant channel's repository ID:

# rhn-channel -a -c repo-id

If you are using Red Hat Subscription Management (RHSM) to manage a host, enable channels using the subscription-manager command. Replace repo-id in the following example with the relevant channel's repository ID:

# subscription-manager repos --enable repo-id

The oo-admin-yum-validator tool will report the repository ID of any missing OpenShift Enterprise channels per a given product version and host role. See the following documentation for full listings of required and optional OpenShift Enterprise channels for both Red Hat Subscription Manager and RHN Classic:

OpenShift Enterprise 2:

Configuring Node Host Entitlements
Configuring Broker Host Entitlements

OpenShift Enterprise 1:

Configuring Node Host Entitlements
Configuring Broker Host Entitlements