virtwho.destination error with SubscriptionManagerUnregisteredError

Environment

• RHEL 7
• RHEL 8
• RHEL 9

Issue

• Virtwho.destination error with SubscriptionManagerUnregisteredError.

# systemctl status virt-who.service 
● virt-who.service - Daemon for reporting virtual guest IDs to subscription-manager
   Loaded: loaded (/usr/lib/systemd/system/virt-who.service; disabled; vendor preset: disabled)
   Active: active (running) since Tue 2023-06-13 13:21:06 CST; 8s ago
 Main PID: 20503 (virt-who)
    Tasks: 5 (limit: 203128)
   Memory: 27.6M
   CGroup: /system.slice/virt-who.service
           └─20503 /usr/libexec/platform-python /usr/bin/virt-who

Jun 13 13:21:06 xxx  /usr/bin/virt-who[20503]: 2023-06-13 13:21:06,783 [virtwho.rhsm_log WARNING] MainProcess(20503):MainThread @config.py:init_co>
Jun 13 13:21:06 xxx  /usr/bin/virt-who[20503]: 2023-06-13 13:21:06,784 [virtwho.rhsm_log INFO] MainProcess(20503):MainThread @executor.py:__init__>
Jun 13 13:21:06 xxx  /usr/bin/virt-who[20503]: 2023-06-13 13:21:06,784 [virtwho.rhsm_log INFO] MainProcess(20503):MainThread @main.py:main:176 - U>
Jun 13 13:21:06 xxx  /usr/bin/virt-who[20503]: 2023-06-13 13:21:06,784 [virtwho.rhsm_log INFO] MainProcess(20503):MainThread @main.py:main:178 - U>
Jun 13 13:21:06 xxx  systemd[1]: Started Daemon for reporting virtual guest IDs to subscription-manager.
Jun 13 13:21:06 xxx  /usr/bin/virt-who[20503]: 2023-06-13 13:21:06,797 [virtwho.main INFO] MainProcess(20503):Thread-2 @libvirtd.py:_connect:280 ->
Jun 13 13:21:06 xxx  /usr/bin/virt-who[20503]: 2023-06-13 13:21:06,966 [virtwho.main INFO] MainProcess(20503):Thread-2 @virt.py:_send_data:986 - R>
Jun 13 13:21:07 xxx  /usr/bin/virt-who[20503]: 2023-06-13 13:21:07,799 [virtwho.destination_1932929990258289388 ERROR] MainProcess(20503):Thread-3> virtwho.manager.subscriptionmanager.subscriptionmanager.SubscriptionManagerUnregisteredError: Unabl>              

Resolution

• The host who running virt-who service should be registered to RHSM first. After attached a VDC subscription to the hypervisor, then unregister the host to clean out previous subscriptions. Finally, re-register the system.

Root Cause

• The host isn't registered to RHSM when starting virt-who service.

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