How to configure DNS for Grid Infrastructure GNS

DNS Concepts

• Host name resolution uses the gethostbyname family of library calls.
• These calls do a configurable search of name space providers, typically including:
• Local /etc/hosts file
• DNS service
• Other directory services such as NIS or LDAP
• DNS traffic is sent as UDP packets, usually to port 53.
• A query may ask for particular types of record, or all records for a name.
• Name resolution for Ipv4 uses A records for addresses, and CNAME records for aliases that must be re-resolved.

DNS Configuration: Example

• The following is assumed about the environment:
• The cluster subdomain is cluster01.us.example.com.
• The address GNS will listen on is 10.228.212.2 port 53.
• The address for the new DNS server is 10.228.212.3.
• The parent name servers are M.N.P.Q and W.X.Y.Z.
• A summary of the steps is shown as follows: 

1. As root, install the BIND (DNS) rpm: # rpm –Ivh bind-9.2.4-30.rpm
2. Configure delegation in /etc/named.conf.
3. Populate the cache file: $ dig . ns > /var/named/db.cache
4. Populate /var/named/db.127.0.0 to handle reverse lookups.
5. Start the name service (named): # /etc/init.d/named start
6. Modify /etc/resolv.conf on all nodes. 

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How to configure DNS for Grid Infrastructure GNS