[cisco-voip] FQDN removal

[David Jengan]

Hi Ryan,

Thanks for the detailed explanation. Sorry I may not have been completely
clear in the ask, what I'm after is to remove the DNS pointers from this
Node, and additionally domain-name and Alias it was built with. So removing
all DNS entries would take care of removing these as well and your
suggestion for removing DNS without reboot still hold valid?

I'm cognizant of the points you raised regarding the server being listed by
hostname instead of IP which isn't the case, and also the URLs are by IP
instead of hostname.
So with this being clear, I can remove the DNS pri/sec pointers from CLI on
the desired node, and not worry about restarting it or the cluster. From
what you've pointed out, it appears that this will trigger db replication
to break and then re-establish? Can you please confirm.

Regarding your query, I agree but at this time I want consistency, while at
a later time implementing DNS would be planned for all nodes together.

In case it helps, listing the hosts on cli shows:
x.x.x.x sub1.domain.com sub1
x.x.x.x sub2
x.x.x.x sub3
x.x.x.x pub


On sub1 node: network details shows DNS entries and domain name.


Best,
David


On Thu, Jan 28, 2016 at 8:55 PM, Ryan Huff <ryanhuff at outlook.com> wrote:

> 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 =
>
>
>
> Email: ryanthomashuff at outlook.com
>
> Spark: ryanthomashuff at outlook.com
>
> Twitter: @ryanthomashuff <http://twitter.com/ryanthomashuff>
>
> LinkedIn: ryanthomashuff <http://linkedin.com/in/ryanthomashuff>
>
> Web ryanthomashuff.com
>
>
> ------------------------------
> *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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