Install DNS server in centOS 5.5

It is the name resolution protocol for TCP/IP networks, such as the Internet. A DNS server hosts information that allows client computers to easily resolve alphanumeric DNS names. ===

WHAT IS DNS?

It is the name resolution protocol for TCP/IP networks, such as the Internet. A DNS server hosts information that allows client computers to resolve easy-to-remember alphanumeric DNS names to the IP addresses that computers use to communicate with each other.

DNS domain type

TOP LEVEL DOMAIN: A two- or three-letter name used to indicate a country, region, or the type of organization that uses a name: ( ANDexample: “.com” )

SECOND LEVEL DOMAIN: Variable length registered name that an individual or organization uses and the Internet. These names are always based on an appropriate top-level domain, depending on the type of organization or geographic location where the name is used. (EXAMPLE: “NETWORK-ORBITA.”)

SUBDOMAIN: Additional names that an organization can create derived from the second-level registered domain name. These include names added to develop the DNS name tree into an organization and divide it into departments or geographic locations. (EXAMPLE: “ROKITOH.RED-ORBITA.COM”)

Configure static addressing

To do this, first we are going to configure a static addressing.

The network card configuration files are located in: /etc/sysconfig/network-scripts/

We access the folder:

Bash

[rokitoh@red.orbita.com~] # cd /etc/sysconfig/network-scripts/

we configure the file ifcfg-eth0 which is where the information is found

Bash

[rokitoh@red.orbita.com network-scripts] # nano ifcfg-eth0

y alli lo configuramos:

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DEVICE=eth0

BOOTPROTO=static #configuración estatica

BROADCAST=192.168.1.255 #dirección de broadcast

HWADDR=05:02:4A:5C:EE:9F # Dirección MAC

IPADDR= 192.168.1.150 # Ip de la interfaz de red

NETMASK= 255.255.255.0 # Máscara de red

NETWORK= 192.168.1.0 # Red en la que se encuentra

ONBOOT=yes # Arranque automático al inicio del sistema
HOSTNAME=dns1.redorbita.local

GATEWAY= 192.168.1.1 # Puerta de enlace

TYPE=Ethernet

Configure the /etc/hosts file

We access the directory

Bash

[rokitoh@red.orbita.com~] nano /etc/hosts

we add the addressing of our IP

text

# Do not remove the following line, or various programas
# that require network functionality will fail.
127.0.0.1             localhost.localdomain                 localhost
192.168.1.150     dns1.redorbita.local                    dns1
::1                         localhost6.localdomain6             localhost6

Configuring the /etc/sysconfig/network file

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NETWORKING=yes
NETWORKING_IPV6=no
HOSTNAME=dns1.redorbita.local

>Configuring the file /etc/resolv.conf
[rokitoh@red.orbita.com~] nano /etc/resolv.conf

We add our domain and the IP address of the DNS server

search redorbita.com

nameserver 192.168.1.150

We restart the network:

Bash

[rokitoh@red.orbita.com~] # /etc/init.d/network restart

We verify that the changes have been made:

Bash

[rokitoh@red.orbita.com~] # sbin/ifconfig

Install and configure Bind9

Bash

[rokitoh@red.orbita.com~] yum install bind bind-utils bind-libs bind-chroot caching-nameserver

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Configure the zone file

We go to the folder

Bash

[rokitoh@red.orbita.com~] cd /var/named/chroot/var/named/

We copy to the file

Bash

[rokitoh@red.orbita.com  named] cp named.zone redorbita.local.zone

We configure the created zone. It should look more or less like this:

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$TTL      1W
@             IN      SOA     dns1.redorbita.local.       root.redorbita.local (
2               ; Serial Number
1W            ; Time To Refresh
1D             ; Time To Retry
28D           ; Time To Expire
1W )         ; Negative Cache TTL
@       IN         NS           dns1     #Nombre del servidor DNS
@     IN         A           192.168.1.150      #IP servidor DNS HOST
dns1   IN         A     192.168.1.150
www     IN         A        redorbita.local            #Nombre servidor web

Now let's create the inverse zone

We copy the file

Bash

[rokitoh@red.orbita.com named] cp named.local 1.168.192.in-addr.arpa.zone

We access the file

Bash

[rokitoh@red.orbita.com named] nano 1.168.192.in-addr.arpa.zone

We configure the file

text

$TTL     1W
@        IN      SOA     dns1.redorbita.local.       root.redorbita.local (
2               ; Serial Number
1W            ; Time To Refresh
1D             ; Time To Retry
28D           ; Time To Expire
1W )         ; Negative Cache TTL
@         IN       NS              dns1,redorbita.local
150       IN       PTR             dns1.redorbita.local

The number «150» corresponds to the last octet of the IP address of our server. In my case the IP address is: 192.168.1.150

Creation and configuration of the file “named.conf”

We access the folder:

Bash

[rokitoh@red.orbita.com etc] cd /var/named/chroot/etc

We create the file:

Bash

[rokitoh@red.orbita.com etc] touch named.conf

Once created make sure to add the following owners

Bash

[rokitoh@red.orbita.com etc] chown root:named named.conf

Now we are going to configure the created file "named.conf"

Bash

[rokitoh@red.orbita.com etc] nano named.conf

We add the following:

text

options { directory «/var/named/»; dump-file «/var/named/data/cache_dump.db»; statistics-file «/var/named/data/named_stats.txt»; allow-recursion { 127.0.0.1; 192.168.1.0/24; }; forwarders { 200.33.146.209; 200.33.146.217; }; forward first; }; zone «.» { type hint; file «named.ca»; }; zone «localhost» { type master; file «localhost.zone»; allow-update { none; }; }; zone «redorbita.local» { type master; file «redorbita.local.zone»; allow-update { none; }; }; zone «1.168.192.in-addr.arpa» { type master; file «1.168.192.in-addr.arpa.zone»; allow-update { none; }; };

We restart the service.

text

/etc/init.d/named restart Deteniendo named:  [OK] Iniciando named: [OK]

To verify that bind is loading the zones, we must execute the following command

Bash

[rokitoh@red.orbita.com etc] tail -80 /var/log/messages | grep named

We verify that everything has gone well:

Bash

[rokitoh@red.orbita.com etc] host redorbita.local 192.168.1.150 [rokitoh@red.orbita.com etc] dig @192.168.1.150 redorbita.local [rokitoh@red.orbita.com etc] dig @192.168.1.150 redorbita.local NS

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Well, we have already finished the installation and configuration of a DNS server in CentOS 5.5, I hope it has been helpful to you,

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Regards, rokitoh

Configuring the /etc/sysconfig/network file

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