Ril,
Unfortunately you can't use haproxy to load balance UDP services.
Ordinarily DNS is load balanced using division of load, so you will have
a.dnshost.com, b.dnshost.com, c.dnshost.com, etc. As DNS is typically
two packets, one request and one response, it doesn't make sense to load
balance it.
Then you will either return a large number of authoritative DNS servers
or, more commonly, divide different domains across different DNS
servers, so put 50000 of your clients on server a/b, the next 50k on
c/d, etc...
Here's the whois info including authoritative DNS servers for
verisign.com using the large number of responses approach:
johnf@carbon:~$ whois verisign.com
[...]
Name Server: A2.NSTLD.COM
Name Server: C2.NSTLD.NET
Name Server: D2.NSTLD.NET
Name Server: E2.NSTLD.NET
Name Server: F2.NSTLD.COM
Name Server: G2.NSTLD.COM
Name Server: H2.NSTLD.NET
Name Server: J2.NSTLD.NET
Name Server: K2.NSTLD.NET
Name Server: L2.NSTLD.COM
Name Server: M2.NSTLD.NET
And here is the whois info for godaddy.com, using the moderate number,
with clients divided across different names servers:
johnf@carbon:~$ whois godaddy.com
[...]
CNS1.SECURESERVER.NET
CNS2.SECURESERVER.NET
CNS3.SECURESERVER.NET
Here's a domain I know is hosted on godaddy, registered with them in 2009:
Domain servers in listed order:
NS27.DOMAINCONTROL.COM
NS28.DOMAINCONTROL.COM
-JohnF
to On 12-09-06 04:59 AM, ril.kidd wrote:
Hello,
I have setup anycast DNS using BIND as the DNS server and BIRD routing
daemon. I have 1 route server
and 5 route clients.
The route clients host the DNS service and also run the routing
daemon. They are peered with the route server which propagtes their
routes. They all run on Ubuntu Server 12.04.
It is my intention to provide load balancing in each route client by
increasing the number of DNS servers in each route client.
I now have two DNS servers per route client (Master and Slave) with
round robin DNS. I am aware that round robin provides load
distribution and not realy load balancing.
Is there a way to load balance DNS in each route client cluster of DNS
servers using HAproxy without any additional machine? Can HAproxy run
on the DNS servers or is there a better way to load balance?
Thank you.
