12.1.1 How to Install DNS

Refer to DNS documentation by using your AnswerBook software for how to set up DNS. The differences in a Sun Cluster configuration are:

• The database is located on the multihost disks rather than on the private disks.

• The DNS server is a logical host rather than a physical host.

1. Decide which logical host is to provide DNS service.

2. Choose a location on the logical host for the DNS database.

   Place the named.boot file and the rest of the files constituting the database here. For example, /logicalhost/dns.

3. In the /etc/resolv.conf file on all Sun Cluster servers that will be running Sun Cluster HA for DNS, specify the IP address of the logical host providing DNS service.

4. In the /etc/nsswitch.conf file, add the string dns after files.

   Make sure the logical host name for the HA-DNS server is present in the /etc/inet/hosts file on all cluster nodes.

5. Test DNS outside the Sun Cluster environment.

   For example:

   # cd /<logicalhost>/dns /usr/sbin/in.named -b /<logicalhost>/dns/named.boot # nslookup <physicalhost>

   Once you have installed and set up DNS, configure, register, and start Sun Cluster HA for DNS as described in "12.2 Installing and Configuring Sun Cluster HA for DNS".