Registering UCS Domains with UCS Central

And now for the moment we've all been waiting for :]
UCS domains need to be registered with UCS Central in order for them to be managed through the server.  Upon registration, you can elect which policies/configurations you want to be managed by UCS Central and which ones you want to keep local to UCSM.  Each registered domain can have specific policies/configurations managed by UCS Central; you don't need to have the same global/local configurations across all UCS domains.  The following is a list of items that can be managed:
-Infrastructure and Catalog Firmware
-Time Zone Management
-Communication Servers
-Global Fault Policy
-User Management
-DNS Management
-Backup and Export Policies
-Monitoring
-SEL Policy
-Power Allocation Policy
-Power Policy

You should also review the Consequences of Policy Resolution Changes/Consequences of Service Profile Changes on Policy Resolution tables so an understanding of how things work with UCS Central can be had:
http://www.cisco.com/c/en/us/td/docs/unified_computing/ucs/ucs-central/deployment-guide/1-0/b_UCSC_Deployment_Guide_10/b_UCSC_Deployment_Guide_10_chapter_0100.html#reference_E5D010B53E054876BDA0FD9D75A92E35

There are a couple of prerequisites for registering a UCS domain with UCS Central:
1. Configure an NTP server and ensure that Central and UCSM are in sync.  Make sure the timezones match as well, else you will end up with an FSM failure:

You can verify the time from the CLI of both nodes:
ucs-esc-n25-B# show clock
Sun Sep 14 09:48:38 EDT 2014

central# show clock
Sun Sep 14 13:56:40 UTC 2014

Why do I have 2 servers in PST timezone configured for everything but PST timezone? :]
It is obviously recommended to configure Central and UCSM to point to an NTP server, but if you need to change the time manually on both servers, you can SSH to the CLI and perform the following:

ucs-esc-n25-B# scope system
ucs-esc-n25-B /system # scope services
ucs-esc-n25-B /system/services # set clock sep 14 2014 11 29 00

NTP Configuration for UCS Central can be found in the Operations Management tab ->Domain Groups -> [Domain Group] -> Operational Policies:

NTP Configuration for UCSM can be found under the Admin tab -> Time Zone Management:

2. Gather your Central and UCSM IPs as well as the Central shared secret (Shhh... it's a secret!)
**Note: You cannot change your UCSM IP address while it is registered with UCS Central.  If this needs to be done for whatever reason, you need to unregister, change and re-register back up with Central.

In order to register your domain, launch UCSM and navigate to the Admin tab -> Communication Management -> UCS Central

Click on Register with UCS Central.

You will be presented with a dialogue box to enter the UCS Central server IP address and shared secret.

And then...

And of course if you would like to unregister your UCS from Central, simply click on the 'Unregister from UCS Central' button.  **Note: If the registered Cisco UCS domains have a latency of greater than 300ms for a round trip from Cisco UCS Central, there might be some performance implications for the Cisco UCS domains.