Is it possible/recommended for two servers to use the same name servers?
For example, if I have two VPS servers; one for business one for personal. Can they both use the same name servers?
asked Aug 4, 2011 at 20:28
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23If all my servers had to use different unique nameservers, I'd be a little bit screwed.– Tom O'ConnorAug 4, 2011 at 20:31
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19@Tom - imagine the environmental damage if it was a 1-DNS-server-to-1-client ratio - the world would look like something from the matrix– Chopper3Aug 4, 2011 at 20:40
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7@Chopper3 - We'd all just revert back to downloading and using THE hosts file.– voretaq7Aug 4, 2011 at 20:43
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10@Answerers: Nice gravatars, guys. Bunch o' Chopper slappies!– squillmanAug 4, 2011 at 20:44
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4@NARKOZ: I've got no idea what you're talking about; they're different.– MikeyBAug 5, 2011 at 12:37
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12 Answers
If they can both see the name servers in question (i.e., not on an internal network to one of them)...sure.
answered Aug 4, 2011 at 20:31
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This would be the major consideration - also many ISP's DNS servers these days only answer recursive requests from "authorized" clients (machines on a network they were set up to serve) to avoid DNS cache poisoning attacks and ungrateful bandwidth/resource moochers using the service for free.– voretaq7Aug 4, 2011 at 21:06
A large proportion of the internet uses the Google name servers 8.8.8.8 and 8.8.4.4 so yes.
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Yes - this is how the internet works.
Indeed, name servers are hearty things that can handle one, two or even three concurrent connections at a time. I think you're safe in using one name server for both VPSs.
Certainly!
If each server needed a server of its own, you'd end up with a horrific sort of pyramid scheme where the servers at the bottom wouldn't have any servers to call upon.
Edit: fixed avatar
Yes, this is the way it is designed to work, otherwise there would be as many name servers as there were sites.
There is absolutely nothing wrong with having more than one client performing lookups against the same server. Just make sure the DNS server is adequately sized to support the load.
answered Aug 4, 2011 at 20:34
There isn't a problem with doing that, it'll work fine.
Yep. This is how "normal" networks are setup.
YES!
A whole bunch of my servers all use the same nameservers.
answered Aug 4, 2011 at 20:34
Two independent name servers seems to be considered sufficient variety. How many computers use the same two name servers seems to be of little consequence. As long as you have two independent sources in different physical whereabouts and dependent on different networks you can attach about as many "clients" as you like. In fact half the world seems to be able to use the same two name servers, there is no reason two servers couldn't :)
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You can surely setup your name-servers in one server and use the same for the other using the cpanel inbuilt DNS Cluster feature( WHM >> Cluster/Remote Access >> Configure Cluster). But, It is better if you,
Configure nameservers as,
ns1/ns2.yourdomain.com --> server 1
ns3/ns4.yourdomain.com --> server 2
Cluster the DNS using the DNS Cluster option in your WHM.
Use these four nameservers for your domains at your registrar.
By this way, if one of your nameserver server fails, the other will successfully serve for DNS requests(ofcourse there is no use, if the whole server is going to fail, unless you have proper mechanisms configured to handle such instances in place).
DNS Clustering Doc: http://docs.cpanel.net/twiki/bin/view/AllDocumentation/WHMDocs/ConfigureCluster
Cheers
