recovery of zone data from a dynamic upated zone when the server goes down

[chrism at sea.checkpoint.com]

Frank,

First and foremost - UPGRADE to a more recent version of BIND, 
particularly if you are experiencing crashes.  The version that you 
have running has *serious* security holes which can be exploited 
remotely.  Your nameserver crashing for no apparent reason could be a 
side-effect of this, and if that is the case, you should probably 
analyze that machine for possible intrusions.  The current version of 
BIND 8 is 8.2.5-REL.

For more information on the security issues, please see:

         http://www.isc.org/products/BIND/bind-security.html

You can download BIND 8.2.5-REL from ISC here:

         ftp://ftp.isc.org/isc/bind/src/8.2.5/bind-src.tar.gz

You can read the security bulletin from Sun here:

http://sunsolve.sun.com/pub-cgi/retrieve.pl?doctype=coll&doc=secbull/204

In regards to your question, dynamic updates are stored in a 
"non-volatile location" - to disk.  Incoming dynamic updates will be 
stored in a log file, usually named <name.of.zone.file>.log.  This log 
file is merged into the db file approximately once per hour, and when 
the nameserver is shut down properly.

In the event of a crash, or other improper shutdown, the log file 
remains on disk.  When the server is restarted, it will then re-process 
the updates from the log file, to restore the nameserver to a 
"pre-crash" state.

Hope this helps!

- Chris

--
          Chris Moore  --  chrism at sea.checkpoint.com
Check Point Software Technologies, Inc.  --   The Meta IP Group
      http://www.checkpoint.com/products/metaip/index.html


On Wed, 07 Nov 2001 11:54:29 "Pozar, Frank" wrote:
- - - For a dynamically updated zone (using Solaris 5.8 bind 8.2.2-P5 on
- master
- nameserver), how would you recover the dns data if the master server
- goes
- down or crashes???
- - Since the db files on disk do not contain the latest nsupdates how 
do
- you
- recover if the system goes down.. In previous mail message, the
- up-to-date
- dns zone data is in a "non-volatile storage location".  Is this
- cache???
- When you send a nsupdate command it immediately goes here from my
- understanding..So where is this location and how do you back it up ?
- - - Thanks
- Frank
- -