HOW TO CONFIGURE LINUX DNS SERVER STEP BY STEP GUIDE EXAMPLE AND IMPLEMENTATION

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　　A DNS server, or name server, is used to resolve an IP address to a hostname or vice versa.
　　You can set up four different types of DNS servers:

• 　　A master DNS server for your domain(s), which stores authoritative records for your domain.
  
• 　　A slave DNS server, which>
  
• 　　A caching-only DNS server, which stores recent requests like a proxy server. It otherwise refers to other DNS servers.
  
• 　　A forwarding-only DNS server, which refers all, requests to other DNS servers.
  

　　CONFIGURE DNS SERVER
　　In this example we will configure a dns server and will test from client side.
　　For this example we are using three systems one linux server one linux clients and one window clients.
　　Step 1 - bind and caching-nameserver rpm is required to configure dns. Check them for install if not found install them
　　

　　
　　
　　Main configuration file for dns server is named.conf. By default this file is not created in/var/named/chroot/etc/ directory. Instead of named.conf a sample file/var/named/chroot/etc/named.caching-nameserver.conf is created. This file is use to make a caching only name server. You can also do editing in this file after changing its name to named.conf to configure master dns server or you can manually create a new named.conf file.
　　
　　
　　In our example we are creating a new named.conf file
　　
　　
　　
　　
　　
　　
　　
　　save this file with :wq and exit
　　
　　Configure zone file
　　We have defined two zone files example.com.zone for forward zone and 0.168.192.in-addr.arpa for reverse zone. These files will be store in /var/named/chroot/var/named/ location. We will use two sample files for creating these files.

　　Change this file exactly as shown in image below
　　
　　
　　By default it will look like this
　　
　　
　　Now changed the ownership of these zone files to named group