DNS server configuration

DNS server configuration

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  INTRODUCTION TO DNSSERVER  DNS provides the resolution of host names to IP & vice versa. . e.g www.wbut.ac.in to 192.168.43.10 (IPv4)  Defines a hierarchical name space where each level of the namespace is separated by a “ . ” e.g 192.168.64.27(class B).
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  Types of DNSServer Master DNS server:- Stores authorative records for your domain Slave DNS server:- Relies on master DNS server for data.
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  Caching-only DNS server:- Storesrecent requests like a proxy server. Forwarding –only DNS server:- Refers to all requests to other DNS servers.
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  DNS Master serverconfiguration STEP-1:  bind & caching name server .  rpm is required to configure DNS. Check them for install ,if not installed, install them as  [root@server~]# rpm –qa cach*  [root@server~]# rpm –qa bind*
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  DNS Master serverconfiguration STEP-2:  Set hostname to server.example.com .  [root@server~]# cat/etc/ sysconfig /network HOSTNAME= server.example.com  Set IP address to 192.168.0.254  [root@server~] ifconfig etho inet addr: 192.168.0.254
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  DNS Master serverconfiguration STEP-3:  Create the main configuration file for DNS, that is named.conf. • By default a sample file  /var/named/chroot/etc/named. caching- nameserver .conf ,is created  Edit this one by named.conf file or create new one as  [root@server etc]# vi/ var/named/chroot/etc/named.conf  Set directory location for Forward zone and Reverse lookup zone
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  DNS Master serverconfiguration  STEP-4:  Configure example.com.zone for forward zone and 0.168.192.in- address.arpa for reverse zone. They will be stored in “/var/named/chroot/var/named/” location.  Change directory to  [root@server named]# cd/ var/named/chroot/var/named  Copy sample file to name we have set in named.conf.  [root@server named]# cp localhost.zone example.com.zone  [root@server named]# cp named.local 0.168.192.in- addr.arpa.zone
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  DNS Master serverconfiguration  STEP-5:  Open forward zone file  [root@server named]# vi example.com.zone and modify as
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  DNS Master serverconfiguration STEP-5 contd: Open reverse lookup zone file  [root@server named]# vi 0.168.192.in-addr.arpa.zone and modify as
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  DNS Master serverconfiguration STEP-6: Change the ownership of these zone file to named group.  [root@server named]# chgrp named example.com.zone  [root@server named]# chgrp named 0.168.192.in- addr.arpa.zone
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  DNS Master serverconfiguration STEP-7:  Now start the named service  If service restart without any error then the master name server is successfully configured
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  Summary  DNS isan integral part in most protocols used in the internet.  Makes the internet human friendly for all of us..  Is the world’s largest distributed database system.  Fits the international model perfectly.  In simple terms DNS is a mapping between names and IP addresses.