Cluster der kan alt/DNS Server

Installation af DNS

Instructions

Install DNS sserver software

sudo apt-get install bind9

configure DNS (Bind)

We need to touch 5 files.

We will edit 3 files.

1. /etc/bind/named.conf.local
2. /etc/bind/named.conf.options
3. /etc/resolv.conf

We will create 2 files.

1. /etc/bind/zones/mydomain.com.db
2. /etc/bind/zones/rev.0.168.192.in-addr.arpa

First step: add domain zone – mydomain.com

• sudo vi /etc/bind/named.conf.local

# Our domain zone
zone "mydomain.com" {
   type master;
   file "/etc/bind/zones/mydomain.com.db";
}
 
# For reverse DNS 
zone "0.168.192.in-addr.arpa" {
   type master;
   file "/etc/bind/zones/rev.0.168.192.in-addr.arpa";
}

We just created a new domain. Please note: later we will create two files named mydomain.com.db and rev.0.168.192.in-addr.arpa files. Also, notice the reverse IP address sequence in the reverse DNS section.
 
# Let’s add the DNS servers from your ISP. In my case, I’m using Comcast DNS servers. You can place the primary and secondary DNS servers here separated by semicolons.


sudo vi /etc/bind/named.conf.options

forwarders {
   68.87.76.178;
};
Save file. Exit.
 
# Now, let’s modify the resolv.conf file found in /etc and place the IP address of our DNS server which is set to 192.168.0.9.


$ sudo vi /etc/resolv.conf

search mydomain.com.
nameserver 192.168.0.9
# Now, let’s define the zones.


sudo mkdir /etc/bind/zones
sudo vi /etc/bind/zones/mydomain.com.db

$TTL 3D
@ IN SOA ns.mydomain.com. admin.mydomain.com. (
   2007062001
   28800
   3600
   604800
   38400
);
mydomain.com.  IN      NS         ns.mydomain.com.
ubuntudesktop  IN      A          192.168.0.10
www            IN      CNAME      ubuntudesktop
pc             IN      A          192.168.0.11
gw             IN      A          192.168.0.1
                       TXT        "Network Gateway"
The TTL or time to live is set for 3 days
 The ns.mydomain.com nameserver is defined
 ubuntudesktop, pc and gateway are entered as an A record
 An alias of www is assigned to ubuntudesktop using CNAME
 
# Let’s create a “rev.0.168.192.in-addr.arpa” file for reverse lookup.


sudo vi /etc/bind/zones/rev.0.168.192.in-addr.arpa

$TTL 3D
@       IN      SOA     ns.mydomain.com. admin.mydomain.com. (
                2007062001
                28800
                604800
                604800
                86400
)
        IN      NS      ns.mydomain.com.
1       IN      PTR     gw.mydomain.com.
10      IN      PTR     ubuntudesktop.mydomain.com.
11      IN      PTR     pc.mydomain.com.
3. Let’s restart Bind to activate our latest changes.


sudo /etc/init.d/bind9 restart
4. Finally, let’s test our new domain and DNS entries.
 
Dig


$ dig mydomain.com
Nslookup


nslookup gw
5. That’s it.