DNS Setup

Posted 09-16-2010 at 07:19 AM by prayag_pjs

Quote:

IP:192.168.20.3
login : root
password:********

Quote:

OS: CentOS-5

Configuration settings:

Code:

# rpm -qa |grep -i bind
bind-9.3.3-7.el5
bind-libs-9.3.3-7.el5
ypbind-1.19-7.el5
bind-chroot-9.3.3-7.el5
kdebindings-3.5.4-1.fc6
bind-utils-9.3.3-7.el5

# vim /var/named/chroot/etc/named.conf

Code:

options {
directory "/var/named";               // Working directory of server
forwarders { 59.144.127.16;59.144.127.17; };
allow-query { any; };                 // Specify which hosts are allowed to query this server
allow-transfer { 192.168.20.0/24; };   // Specify hosts that are allowed to receive zone
                                        // transfers from this server
recursion yes;                        // Enable recursive queries
allow-recursion {192.168.20.0/24; };   // Specify which hosts can perform recursive queries.
version "Centos-5";  // Set version reported by ndc and when querying
                                         // version.bind in the chaos class
};

// The following controls who can access this server using rndc.
// Bind to 127.0.0.1 and allow only localhost access.
controls {
        inet 127.0.0.1 allow { localhost; } keys { rndckey; };
};

zone "." IN {                // Hints file containing root servers
        type hint;
        file "named.root";
};

zone "localhost" IN {
        type master;
        file "localhost.zone";

        allow-update { none; };
};

zone "0.0.127.in-addr.arpa" IN {
        type master;
        file "named.local";
        allow-update { none; };
};

zone "example.com" IN {          // Forward lookup zone for xyz.com
        type master;         // This is a master zone
        file "fwd.zone";   // Zone information stored in /var/named/db.xyz.com
        allow-update { none; };
};

zone "1.168.192.in-addr.arpa" IN {
        type master;
        file "rev.local";
        allow-update { none; };
};
                                  // information is kept locally on disk under /var/named.
include "/etc/rndc.key";     // Private key used for secure remote administration

#vim /var/named/chroot/var/named/fwd.zone

Code:

$TTL    86400
$ORIGIN example.com.
; If not specified, it's taken from named.conf
;  ns1 is a nameserver for the domain.  root is the
;  e-mail address of the owner of the domain.  The domain
;  is appended to each of these values since they don't
;  end with a period. (e.g. they become ns1.xyz.com
;  and root.xyz.com)
@           1D IN SOA server1.example.com. root.server1.example.com. (
                            2002011901      ;; serial
                            3H              ;; refresh
                            15M             ;; retry
                            1W              ;; expire
                            1D )            ;; minimum


; These two lines specify the same domain.
; @ means take it from the $ORIGIN or the zone
; specified in named.conf
;@                        IN NS     server1.example.com.
;example.com.         IN NS     server1.example.com.
;;server1.example.com.         IN NS     server1.example.com.

          IN NS     server1.example.com.
          IN NS     example.com.

server1                        IN A      192.168.20.3
production                  IN A      192.168.20.4
backup                        IN A      192.168.20.11
itdpc02                        IN A      192.168.20.102
itdpc03                        IN A      192.168.20.103
itdpc04                        IN A      192.168.20.104
itdpc05                        IN A      192.168.20.105

#vim /var/named/chroot/var/named/rev.local

Code:

$TTL    86400
@           1D IN SOA server1.example.com. root.server1.example.com. (
                            2002011901      ; serial
                            3H              ; refresh
                            15M             ; retry
                            1W              ; expire
                            1D )            ; minimum

; These two lines specify the same domain.
; @ means take it from the $ORIGIN or the zone specified in named.conf
              IN NS       server1.example.com.
              IN NS       example.com.
3            IN PTR       server1.example.com.
4            IN PTR       production.example.com.
11          IN PTR       backup.example.com.

Code:

# /etc/init.d/named restart
# chkconfig named on

Troubleshoot DNS :

Code:

# netstat -tulpn | grep :53

Code:

# netstat -atve |grep :53
#named-checkconf /var/named/chroot/etc/named.conf
# named-checkzone example.com /var/named/chroot/var/named/fwd.zone

Code:

# named-checkzone example.com /var/named/chroot/var/named/rev.local

Code:

#host www.example.com

Code:

# dig example.com

DNS Setup

Comments