Yum displays system not registered warning in RHUI based clients

by Danila Vershinin, September 7, 2021

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Operating System and Software

Rocky Linux
Red Hat Update Infrastructure (RHUI)

Problem

Yum update in RHUI based clients shows system not registered.
How to remove registration warning in RHUI systems?
Disable subscription manager repositories in RHUI based systems.
The yum command displays warning message while listing repositories in On-demand cloud instances which are fetching updates from RHUI server.

   # yum repolist
    Updating Subscription Management repositories.
    Unable to read consumer identity
    This system is not registered to Red Hat Subscription Management. You can use subscription-manager to register.
    repo id                                                                                   repo name
    rhui-rhel-8-for-x86_64-appstream-rhui-rpms            Rocky Linux 8 for x86_64 - AppStream from RHUI (RPMs)
    rhui-rhel-8-for-x86_64-baseos-rhui-rpms               Rocky Linux 8 for x86_64 - BaseOS from RHUI (RPMs)

How to Fix

The subscription manager plugin must be disabled (change enabled=1 to enabled=0) to remove the warnings as the updates are fetched from RHUI via CDS (Content Delivery Server).

   # cat /etc/yum/pluginconf.d/subscription-manager.conf
    [main]
    enabled=1

Origin of the Problem

The Red Hat Update Infrastructure includes components like RHUA (Red Hat Update Appliance) and CDS.
The RHUA downloads the new packages from Red Hat’s CDN (Content Delivery Network) which gets copied to CDS nodes.
The RHEL clients intergrated with RHUI receives updates from repositories provided by CDS nodes.
The RHUI systems need not be registered with subscription manager which generates the warning.

   This system is not registered to Red Hat Subscription Management.

Diagnostic Steps

Confirm the RHUI client rpm is installed in the system.

   # rpm -qa | grep rhui-client*

CDS URL’s will be used by the repo configuration.

   # grep mirrorlist /etc/yum.repos.d/rh-cloud.repo
    mirrorlist=https://cds.xxxxxxxx.com/pulp/mirror//content/dist/rhel8/rhui/$releasever/x86_64/appstream/os
    mirrorlist=https://cds.xxxxxxxx.com/pulp/mirror//content/dist/rhel8/rhui/$releasever/x86_64/baseos/os

Solutions