[OpenAFS] Questions about multihoming servers

stephen@physics.unc.edu stephen@physics.unc.edu
Tue, 24 Sep 2013 19:04:57 -0400 (EDT)

I know I've played around with multihomed dbservers before, but it was long 
ago, a different use case, on a different platform, and I had problems 
then! :-\

[edit] I just checked rt.central.org and found my ticket. No update in 9 
years. <https://rt.central.org/rt/Ticket/Display.html?id=15640>

Anyway, I don't think I'm mis-reading the Admin Guide (but I concede that 
what it says may be wrong!)

In any event, the QuickStartUnix guide also says they can be multihomed: 
"It is best to maintain a one-to-one mapping between hostnames and IP 
addresses on a multihomed database server machine..."

But I know all of the openafs docs are often out of date or downright 
wrong, which is why I asked on the list.

As far as you know, is the "it doesn't work" definitive?


On Tue, 24 Sep 2013, Jeffrey Altman wrote:

> Stephen,
> I believe you are misreading the Admin Guide.  It indicates that File
> Servers can be multi-homed and that they self-register.  If you have DB
> servers that are multi-homed you need to pick a single network interface
> for them to use
> If given the choice of interface bonding and multi-homed, choose bonding.
> Jeffrey Altman
> On 9/24/2013 6:01 PM, stephen@physics.unc.edu wrote:
>> I have two general questions about multihomed AFS servers to pose to list.
>> - Is there any obvious reason to choose multihoming of a fileserver
>> rather than link aggregation, assuming both are supported in a given
>> environment?
>> - The Admin Guide on docs.openafs.org indicates that multihomed DB
>> servers work.[1]
>> Is this true in an environment where both IPs are on the same (campus)
>> network and they may share the same default route?
>> Specifically, I'm curious about linux dbservers; clients may contact the
>> server via IP A but get an answer from IP B, if it is the default
>> interface. Will the clients care? What if the IP replying isn't in the
>> client's CellServDB (or DNS) at all? Does the answer change depending on
>> client version?
>> [1] <http://docs.openafs.org/AdminGuide/index.html#HDRWQ138.html>
>> Cheers,
>> Stephen
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