Podizanje lokalnog DNS cache ce ubrzati vasu internet konekciju posto ce vreme za “posao prevodjenja” (konvertovanje imena domena u IP adrese) biti neznatno sa pretpostavkom da DNS cache dobija informacije od parent DNS-a.
FreeBSD vec dolazi sa bind-om u svakom izdanju ali ja vise volim da koristim djbdns.
Jednostavan nacin za podizanje lokalnog DNS cache na FreeBSD-u koristeci portove:
Instalirajte djbdns portove
su-2.05b# whereis djbdns djbdns: /usr/ports/dns/djbdns su-2.05b# cd /usr/ports/dns/djbdns && make install clean
Samo pritisnite OK I instalacioni process ce zapoceti.
Konfiguracija
# pw groupadd nofiles -g 800 # pw useradd dnslog -g nofiles -u 810 -d /nonexistent -s /sbin/nologin # pw useradd dnscache -g nofiles -u 811 -d /nonexistent -s /sbin/nologin
Ove komande ce kreirati grupu nofiles, I korisnike dnslog i dnscache.
# dnscache-conf dnscache dnslog /etc/dnscache 127.0.0.1 # ln -s /etc/dnscache /var/service # echo ‘nameserver 127.0.0.1′ >/etc/resolv.conf
Ove komande postavljaju IP adresu 127.0.0.1 za DNS cache “samo” za taj kompjuter.
Da bi mogli da koristite DNS cache na vasoj mrezi, moracemo da izdamo jos nekoliko komandi:
# dnscache-conf dnscache dnslog /etc/dnscache 192.168.1.1 # touch /etc/dnscache/root/ip/192.168.1 # ln -s /etc/dnscache /var/service
Sada svaki klijent moze da doda 192.168.1.1 kao validan DNS resolver:
Da koristite snagu “daemontools-a” moramo da dodamo sledeci unos u rc.conf:
svscan_enable=”YES”
Prvi put mora da se startuje manuelno:
su-2.05b# /usr/local/etc/rc.d/svscan.sh start
Da proverimo dali servis radi:
su-2.05b# ps -ax | grep dns 338 ?? I 0:00.03 supervise dnscache 90515 ?? S 0:03.51 /usr/local/bin/dnscache
Da proverite dali dnscache “stvarno radi”:
su-2.05b# tail -f /etc/dnscache/log/main/current
Primer izlaza:
su-2.05b# tail -f /etc/dnscache/log/main/current @4000000046375a22168f3ee4 cached 1 i.gtld-servers.net. @4000000046375a22168fcf6c cached 1 j.gtld-servers.net. @4000000046375a2216905ff4 cached 1 k.gtld-servers.net. @4000000046375a221690ec94 cached 1 l.gtld-servers.net. @4000000046375a2216917d1c cached 1 m.gtld-servers.net. @4000000046375a22169209bc cached 1 a.gtld-servers.net. @4000000046375a221692c154 cached 1 b.gtld-servers.net. @4000000046375a22169351dc cached 1 c.gtld-servers.net. @4000000046375a221693de7c cached 1 d.gtld-servers.net. @4000000046375a2216945794 tx 0 255 mx44.alanistz.com. com. c005061e c0304f1e c036701e c023331e c037531e c02a5d1e c01a5c1e c0210e1e c029a21e c00c5e1e c02bac1e c01f501e c034b21e @4000000046375a222673d964 rr cc4a7021 86400 1 mx74mi.clarmu.info. d035034a @4000000046375a2226787514 rr cc4a7021 86400 1 mx144pb.clarmu.info. 42212090 @4000000046375a222678889c rr cc4a7021 86400 1 mx174hi.clarmu.info. 42f890ae @4000000046375a222678983c rr cc4a7021 86400 1 mx187tr.clarmu.info. 416f11bb @4000000046375a222678abc4 rr cc4a7021 86400 1 mx204pa.clarmu.info. 42217dcc @4000000046375a222678bb64 rr cc4a7021 86400 ns clarmu.info. mx74mi.clarmu.info. @4000000046375a222678ceec rr cc4a7021 86400 ns clarmu.info. mx204pa.clarmu.info. @4000000046375a222678de8c rr cc4a7021 86400 ns clarmu.info. mx187tr.clarmu.info. @4000000046375a222679059c rr cc4a7021 86400 ns clarmu.info. mx174hi.clarmu.info. @4000000046375a222679153c rr cc4a7021 86400 ns clarmu.info. mx144pb.clarmu.info. @4000000046375a22267924dc stats 379 144625 13 0 @4000000046375a2226793864 cached 1 mx74mi.clarmu.info. @4000000046375a2226794804 cached 1 mx204pa.clarmu.info. @4000000046375a22267957a4 cached 1 mx187tr.clarmu.info. @4000000046375a2226796744 cached 1 mx174hi.clarmu.info
Cestitamo, vas DNS cache radi.
