[cisco-voip] FQDN removal

[Ryan Huff]

Hi David,


Removing the DNS server entries alone from the cluster nodes, would not require a restart. Removing/changing the hostname/domain name of the nodes would; this carries its own set of risks and considerations with SBD and db replication. If you are doing that, please consult; http://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/install/10_0_1/ipchange/CUCM_BK_C3782AAB_00_change-ipaddress-hostname-100/CUCM_BK_C3782AAB_00_change-ipaddress-hostname-100_chapter_011.html first.


If you are just removing the DNS entries from the node then what you'll want to be uniquely aware of and cautious with is; any node listed in the CM ProccessNode table (Cisco Unified CM Administration -> System -> Server) with a hostname or FQDN (Vs. an IP Address). If you have any nodes in the CM Server section listed by either hostname or FQDN, you'll need to first change those to IP addresses BEFORE removing the DNS server entries in the CLI.


Additionally, you'll want to take stock of any 3rd party applications/integrations that you might have which requires the CUCM nodes to perform DNS queries/lookups. You will also likely want to verify that the the Phone URL Parameters under Enterprise Parameters are using IP addresses and not hostnames/FQDNs.


After you're done with your changes, you'll want to verify good DB Replication in the cluster (from the CLI of the publisher, issue utils dbreplication runtimestate and verify Setup Completed for each node).


This is more just a question out of my own curiosity, is there a specific reason you do not want to use DNS? In modern versions of CUCM such as 10, DNS is generally recommended. Additionally, several UC applications that could be used with CUCM are enhanced with DNS (IM&P, CUC) not to mention the UCCX would consider it a requirement. While you may not be using those products now, you never know what you may do in the future, always best to bake in the scalability early on, IMO.


= Ryan =



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________________________________
From: cisco-voip <cisco-voip-bounces at puck.nether.net> on behalf of David Jengan <davidjengan at gmail.com>
Sent: Thursday, January 28, 2016 8:27 PM
To: cisco-voip at puck.nether.net
Subject: [cisco-voip] FQDN removal

Hi All,

My CUCM 10 cluster doesn't have DNS dependency, but one of the nodes has got the DNS/FQDN setup which I'd like to remove. I can do dns removal from CLI, but not able to find clear instructions on whether the entire cluster would needs to be rebooted. If yes, any recommended sequence/steps to follow?, if not, the node undergoing the change needs to be restarted?

Thanks
David
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