Ubuntu dns files

DNS is domain name system. In Ubuntu, DNS package is included in bind9 software package. The dns server is called named. Basically what dns do, it translates name to ip address. It also translates ip address to name, which is called reverse dns.

Setting up dns involves several other files in Ubuntu system, the directly involved bind9 configuration files package and related files not in bind package. Here are all files needed to set up dns server, in bind package and not in bind package.

DNS configuration files in bind package:

luzar@ubuntu:~$ cd /etc/bind/
luzar@ubuntu:/etc/bind$ ls -l
total 44-rw-r--r-- 1 root root  237 2008-04-09 15:42 db.0
-rw-r--r-- 1 root root  271 2008-04-09 15:42 db.127
-rw-r--r-- 1 root root  237 2008-04-09 15:42 db.255
-rw-r--r-- 1 root root  353 2008-04-09 15:42 db.empty
-rw-r--r-- 1 root root  270 2008-04-09 15:42 db.local
-rw-r--r-- 1 root root 2878 2008-04-09 15:42 db.root
-rw-r--r-- 1 root bind  907 2008-04-09 15:42 named.conf
-rw-r--r-- 1 root bind  165 2008-04-09 15:42 named.conf.local
-rw-r--r-- 1 root bind  695 2008-04-09 15:42 named.conf.options
-rw-r----- 1 bind bind   77 2008-10-20 10:56 rndc.key
-rw-r--r-- 1 root root 1317 2008-04-09 15:42 zones.rfc1918
luzar@ubuntu:/etc/bind$

Related files not in bind package:

• /etc/resolv.conf
• /etc/hosts


• /etc/nsswitch.conf

Here are screenshots of the files:

/etc/named.conf

/etc/named.conf is the main dns server configuration file. Here is a default content screenshot:

/etc/resolv.conf

/etc/resolv.conf is dns resolver file. Here is a default content screenshot:

/etc/bind/named.conf.local

/etc/bind/named.conf.local is a zone configuration file for dns setup. Here is a default content screenshot:

/etc/bind/named.conf.options

/etc/bind/named.conf.options file contains generic options for bind bind name server. Here is a default content screenshot:

Bind databases files

/etc/bind/db.root

/etc/bind/db.local

/etc/bind/db.0

/etc/bind/db.255

/etc/bind/db.127

/etc/bind/db.empty