On Wed, 2011-01-12 at 13:29 -0500, Deny IP Any Any wrote: > On Wed, Jan 12, 2011 at 1:12 PM, William L. Thomson Jr. > <[email protected]> wrote: > > I have never understood that for this reason alone. If you only have one > > real server, who cares how many DNS servers you have. If that one server > > is down/offline/unavailable, what good does multiple DNS servers do > > anyone? > > *If* you only have one server, then you've already made lots of > compromises with regard to business continuity, and one more case of > lack of redundancy clearly doesn't bother you.
Single servers are likely much more common than fully redundant environments. I can't recall how many times I have called into a company to hear their systems are down, unavailable, etc. At times major financial institutions, who likely have redundancies in place. > > Not to mention one of the simplest, most straight forward, and reliable > > server services I have ever setup or worked with is DNS. It has never > > made sense to me why you need two DNS servers, ideally on separate > > networks. Now I do understand the importance of DNS in the general scope > > of things. But again, if your servers are down, what good does a bunch > > of DNS servers do you? > > What good does having a bunch of servers do you if your one-and-only > DNS server has a hardware failure (or its NIC dies, or somebody > unplugs it, or you are doing an 'apt-get update' on it, or somebody > fat-fingers an ACL and blocks all packets to it, or BIND/kernel > segfaults)? The idea is to make every link in the chain redundant if > you really need high uptime, not just bits-n-pieces. Well I am not really advocating a single DNS server per se. But if you only have a single server, then not sure what good having multiple DNS servers really does you. Short of the scenarios mentioned in another thread. > > Case in point, firebirdsql.org seems to be down atm. But they have a > > whole bunch of DNS servers (~6) doing name to IP translation. Which > > considering you can't get anything by hitting the single IP address all > > 6 name servers serve up. Almost moot that you get an IP at all from DNS. > > This seems to be a case of having too much redundancy in certain > areas, and clearly, not enough in others. Which I think is quite common, but I could be wrong. -- William L. Thomson Jr. Obsidian-Studios, Inc. http://www.obsidian-studios.com --------------------------------------------------------------------- Archive http://marc.info/?l=jaxlug-list&r=1&w=2 RSS Feed http://www.mail-archive.com/[email protected]/maillist.xml Unsubscribe [email protected]
