Wildcard DNS record point to multiple servers

Question

I would like to give my users their own subdomain like jack.example.com, james.example.com, and is using wildcard DNS record to do that.

But now I would like to separate users into multiple servers, like users A~J is on server A, and users K~S is on server B...

Is there a way to do this?

score 3 · Answer 1 · edited Nov 28 '13 at 02:08

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A wildcard DNS entry is a catch-all. There is no way to point half of a wildcard entry to one server and half to another.

You could individually list DNS entries for half your users and have them sent to one server, and then send the rest to another server.

You could also employ a load balancer that handles all the traffic and then sends the traffic to various servers.

edited Nov 28 '13 at 02:08

dan

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answered Nov 27 '13 at 16:55

Stephen Ostermiller

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score 0 · Answer 2 · answered Apr 07 '20 at 15:46

If your goal is simply load balancing, as Stephen's answer suggesting. However, per the DNS and BIND 9 specifications, you can configure your DNS server to perform a round robin through multiple servers. Using this approach, you could enter each of your destinations and the DNS server would return different IP addresses by round robin.

score 0 · Answer 3 · answered Apr 01 '13 at 10:42

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You could do this first by hand with already registered users, sort them to different servers, and with new registrations, having a script based on username to store data on selected server.

answered Apr 01 '13 at 10:42

lucasf991

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score -1 · Answer 4 · edited Apr 06 '20 at 17:54

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Dns set to the wildcard as:

a*.example.com -> ip server 1
b*.example.com -> ip server 2
c*.example.com -> ip server 1

edited Apr 06 '20 at 17:54

Patrick Mevzek

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answered Sep 03 '14 at 21:55

leohidalgo

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You can not do wildcards like that in the DNS. * can only be a label by itself and matches everything. This was already spelled out in Stephen's reply almost one year before this one. – Patrick Mevzek Apr 06 '20 at 17:55
DNS does not have this functionality, unfortunately. – Maximillian Laumeister May 08 '20 at 03:07

Wildcard DNS record point to multiple servers

4 Answers4