Djbdns

Before installing djbdns, you must have daemontools and ucspi-tcp installed.

Installation
cd /usr/src wget http://cr.yp.to/djbdns/djbdns-1.05.tar.gz tar xpzf djbdns-1.05.tar.gz cd djbdns-1.05 make make setup check

chmod 0755 /usr/local /usr/local/bin The chmod is because hier.c is modifying /usr/local and /usr/local/bin to 02755 and /etc/security then complaints.

dnscache:
groupadd -g 5000 nofiles useradd -u 5010 -g nofiles -d /var/dnscache -s /sbin/nologin dnscache useradd -u 5011 -g nofiles -d /var/dnscache/log -s /sbin/nologin dnslog

dnscache-conf dnscache dnslog /var/dnscache 192.168.0.1 cd /var/dnscache dd if=/dev/srandom of=seed bs=128 count=1 chown -R dnscache:nofiles. chown -R dnslog log touch /var/dnscache/root/ip/192.168.0

ln -s /var/dnscache /service Where 192.168.0.1 is the IP address where you will run the DNS cache. (with dnscache-conf)

You allow the entire 192.168.0 network to access your DNS cache. (with touch)

Dumpcache:
As dnscache works only on memory it will discard all it's content of cache data upon reboot. This is a patch to djbdns that will enable you to dump the cache from a running dnscache, or load a previously dumped cache at startup. It is useful when you have an OpenBSD box that you shutdown daily and you want to preserve all the dns resolved catches that djbdns have done.

Download the patch from http://efge.free.fr/djbdns/ Outside of your djbdns-1.05 directory apply the patch, stop dnscache, compile and install: patch -p0 < patch-dnscache-dumpcache-v4.txt svc -d /service/dnscache cd djbdns-1.05 make make setup check Configure some dumpcache options and restart dnscache: cd /service/dnscache/env echo dump/dumpcache > DUMPCACHE echo dump/dumpcache.tmp > DUMPCACHETMP echo dump/dumpcache > SLURPCACHE svc -t /service/dnscache You can configure the logs to show only the lines you want. Here is an example of /service/dnscache/log/run: exec setuidgid dnslog multilog t '-*' '+* stats *' '+* slurp *' \ '+* dump *' '+* tcp*' '+* cachesize *' '+* starting' ./main You need to tell OpenBSD to dump the cache to the file upon reboot or shutdown. Here is an example of /etc/rc.shutdown: /usr/local/bin/svc -a /service/dnscachex At startup dnscache will automatically read the file in SLURPCACHE and load its contents.
 * 1) !/bin/sh
 * 1) dump djbdns cache:

Links

 * daemontools
 * ucspi-tcp