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Question Information  
 
 

Forum:    OS.Linux.Networking    
Posted By:    zootx  
Deadline Date:    May 06, 2000 at 10:29pm GMT+5    
Price:    Free    
 
BIND cache file   


 I've noticed BIND keeps a cache of all the names that are resolved.  Is there a
 location that this file is kept?  Is this defined in named.conf?

thanks!
rob 
   
 


  Answer Information  
 
 

Expert:    utidjian  
Date Answered:    May 04, 2000 at 11:58pm GMT+5    
Score for Customer:       
Score for Expert:       
 
 Heh... answered this recently elsewhere.

bIND keeps all resolved hostnames in RAM. It is not written or read from a
 file. You can "dump" the contents of this list to a file with the following
 command: (as root)

/usr/sbin/ndc dumpdb

and it will dump to the file /var/named/named_dump.db which is "human
 readable". Where it dumps to may be configurable in /etc/named.conf. It may dump to
 /var/tmp/named_dump.db instead.

Alternatively, you can edit /etc/named.conf to log all lookups to
 /var/log/messages. I have the following lines in my /etc/named.conf file:

[begin file snippet]

options {
        directory "/var/named";
};


logging { 

        category queries { default_syslog ; };
        category config { default_syslog ; };
        category lame-servers  { default_syslog ; };
        category statistics { default_syslog ; };
        category panic  { default_syslog ; };
        category update { default_syslog ; };
        category ncache { default_syslog ; };
        category db { default_syslog ; };
        category security { default_syslog ; };
        category os { default_syslog ; };
        category insist { default_syslog ; };
        category maintenance { default_syslog ; };
        category load  { default_syslog ; };


};

[end file snippet]

The rest is just the "zone" entries. As you can see I like extensive logging.
 If yours is a busy DNS server be sure that the /var partition is big enough to
 hold some large /var/log/messages files. There are plenty of other options for
 debugging... see the relevent manpages and HOWTOS for ndc, named, bind, nslookup
 and http://www.linuxdoc.org/HOWTO/DNS-HOWTO.html

-DU...etc...