Skip to main content

networking - DNS: Can master server be non-authoritative?



We have about 10 domains in 10 different countries and we want to setup some centralized DNS management. Basically we have this design in mind (all servers are RHEL, with bind as DNS):



Have 1 master DNS server hidden, not accessible from internet, which contains zone files for all these domains, so that we can change everything on 1 place. Have slave DNS servers in each country to which these zones are respectively replicated to from master server.



The weird part of this design as I see it, is that only slave servers would be in DMZ and accessible from internet, and only them would be authoritative, having NS record for each such domain.




Does it make any sense? Is it even possible to have a master server for a domain that isn't considered authoritative as it doesn't itself have NS record? (there is no point in having NS record for server that's not visible from internet I guess).


Answer



From my experience, there is nothing wrong with your design, except for the fact that you are using only one master - you need to have some redundancy. With two or three hidden masters, which are always in sync - the slave servers can refresh their zones even if one or two masters are down.



Many large organizations actually don't want to expose their DNS servers, as they don't want to deal with the headache of DDOSing and global availability etc. What they end up doing is use third party DNS providers such as Dyn or UltraDNS to expose the NS records for their domains, these NS records are slave name servers from third party. Internally the organization will keep its own hidden master servers, make dns changes in those server internally and then have the slave servers from the DNS service providers pull the latest changes. Any external users requests go to the slave name server managed by the third party.


Comments

Post a Comment

Popular posts from this blog

linux - iDRAC6 Virtual Media native library cannot be loaded

When attempting to mount Virtual Media on a iDRAC6 IP KVM session I get the following error: I'm using Ubuntu 9.04 and: $ javaws -version Java(TM) Web Start 1.6.0_16 $ uname -a Linux aud22419-linux 2.6.28-15-generic #51-Ubuntu SMP Mon Aug 31 13:39:06 UTC 2009 x86_64 GNU/Linux $ firefox -version Mozilla Firefox 3.0.14, Copyright (c) 1998 - 2009 mozilla.org On Windows + IE it (unsurprisingly) works. I've just gotten off the phone with the Dell tech support and I was told it is known to work on Linux + Firefox, albeit Ubuntu is not supported (by Dell, that is). Has anyone out there managed to mount virtual media in the same scenario?
Post a Comment
Read more

hp proliant - Smart Array P822 with HBA Mode?

We get an HP DL360 G8 with an Smart Array P822 controller. On that controller will come a HP StorageWorks D2700 . Does anybody know, that it is possible to run the Smart Array P822 in HBA mode? I found only information about the P410i, who can run HBA. If this is not supported, what you think about the LSI 9207-8e controller? Will this fit good in that setup? The Hardware we get is used but all original from HP. The StorageWorks has 25 x 900 GB SAS 10K disks. Because the disks are not new I would like to use only 22 for raid6, and the rest for spare (I need to see if the disk count is optimal or not for zfs). It would be nice if I'm not stick to SAS in future. As OS I would like to install debian stretch with zfs 0.71 as file system and software raid. I have see that hp has an page for debian to. I would like to use hba mode because it is recommend, that zfs know at most as possible about the disk, and I'm independent from the raid controller. For us zfs have many benefits, ...
Post a Comment
Read more

linux - Awstats - outputting stats for merged Access_logs only producing stats for one server's log

I've been attempting this for two weeks and I've accessed countless number of sites on this issue and it seems there is something I'm not getting here and I'm at a lost. I manged to figure out how to merge logs from two servers together. (Taking care to only merge the matching domains together) The logs from the first server span from 15 Dec 2012 to 8 April 2014 The logs from the second server span from 2 Mar 2014 to 9 April 2014 I was able to successfully merge them using the logresolvemerge.pl script simply enermerating each log and > out_putting_it_to_file Looking at the two logs from each server the format seems exactly the same. The problem I'm having is producing the stats page for the logs. The command I've boiled it down to is /usr/share/awstats/tools/awstats_buildstaticpages.pl -configdir=/home/User/Documents/conf/ -config=example.com awstatsprog=/usr/share/awstats/wwwroot/cgi-bin/awstats.pl dir=/home/User/Documents/parced -month=all -year=all...
Post a Comment
Read more