12.1 Installing DNS

Sun Cluster HA for DNS is DNS running under the control of Sun Cluster. This section describes the steps to take when installing DNS to enable it to run as the Sun Cluster HA for DNS data service.

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".