On 04/13/2012 10:28 PM, Jakub Hrozek wrote:
On Fri, Apr 13, 2012 at 01:04:55PM -0700, Brian Cook wrote:
    Ideally I would rely on a -group- of servers, and then rely on DNS if it
    is down.  I don't want to hammer one server.  We're talking about 500-1000
    servers running virtual machines, so potentially a lot of traffic.  Got
    any suggestions for that?

Hello Brian,

I'm not sure I understand what you are trying to achieve. Are you trying
to spread the client load among replicas? If so, then I think the SRV
records in DNS are really the best answer. You can organize the servers
in "tiers" by using the priority field and then spread the load in a
tier by using the "weight" field.


if I understand correctly, you need to set different priority for SRV records and this new priority has to be dependent on client's IP address.

AFAIK only way how to accomplish this is BIND "view" clause. You have to:
- create copy of original zone for each location and modify SRV record priorities - then you have to set "views" and create mapping between IP address <-> new zone

This way requires multiple copies of original zone, each with little differences. In case of classical zone files is not a big problem: You can keep SRV records separated in small files and "$INCLUDE" normal records to them from single place.

In cases with LDAP database it's a much harder, because there is no simple $INCLUDE clause, I think. We have to consult this problem with 389 guys ... It can be task for some kind of directory server plugin.

Some examples and documentation:
(It belongs to some SIP solution, but it's exactly what you want.)



I'm adding BIND maintainer to this discussion.

Petr^2 Spacek

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