On Tue, Sep 19, 2006 at 02:00:23PM +0800, pinoyskull wrote:
>> One of my client's domain has multiple IPs for redundancy, i configured
>> his www as such
>>
>> www IN A 10.10.10.10
>> www IN A 192.168.0.10
>>
>> Is there a way to prioritize 10.10.10.10 over 192.168.0.10? How do i
>> configure it?
I missed the original question about this but if you're really
interested in doing somethign in software rather than buying some kind
of load-balancing hardware, then you could write your own (simple)
backend for powerdns.
powerdns is in ports and it has a simple "pipe" interface to the daemon
that would let you write your own "proporitional-share" dns responder
for some set of RRs.
Check out the geographic load balancing that the blitzed.org guys use...
http://wiki.blitzed.org/DNS_balancing
Basically, you would delegate a subdomain (bar.example.org) to the
server running your custom powerdns config and all lookups of
foo.bar.example.org would end up at your server, where your custome (20
or 60 lines of perl) powerdns module could return which ever of the two
IPs you prefer, either statistically, or based on some kind of remotely
fetched load average, ping time, other-availibility-metric, etc.
So, say you wanted 80% of your traffic to go to the primary box, then
you turn off caching in your powerdns config file and have your pipe'd
child return the primary IP 8 times for every 2 times you return the ip
of the other box etc. Or always return the primary server unless it is
having problems, in which case you return the secondary. Of course you
want the TTL on these records, or perhaps the delegated subdomain to be
low so the client doesn't cache it much.
I'm currently got a geo-balanced test setup I've been playing with - it
returns CNAMES to XX.clift.org for any lookup of test.geo.clift.org,
where XX are theoreticaly country codes based on what IP addresses you
make the requests from. The quality of the free geo-ip info isn't
great, but at least it gets you on the right continent. The geo-ip data
is 'free' via rsync from countries.nerd.dk - see
http://countries.nerd.dk/more.html for more information
Anyway, it'd take a bit of work, but would be doable.
Fred Clift
fred 'AT' clift <dot> org
_______________________________________________
freebsd-stable@freebsd.org mailing list
http://lists.freebsd.org/mailman/listinfo/freebsd-stable
To unsubscribe, send any mail to "[EMAIL PROTECTED]"
