This section describes the steps to install DNS and to enable DNS to run as Sun Cluster HA for DNS.
Sun Cluster HA for DNS uses the Internet Domain Name Server (in.named) software that is bundled with the Solaris 8 and Solaris 9 operating environments. See the in.named(1M) man page for information on how to set up DNS. The Sun Cluster configuration involves the following differences.
The DNS database is located on the cluster file system, not a local file system.
A network resource (relocatable IP address), not the name of a physical host, identifies the name of a DNS server.
Become superuser on a cluster member.
Decide on the network resource that will provide the DNS service.
This name should be an IP address (logical hostname or shared address) that you set up when you install the Sun Cluster software. See the Sun Cluster Concepts Guide for Solaris OS document for details on network resources.
Ensure that the DNS executable (in.named) is in the directory /usr/sbin.
The DNS executable is bundled with the Solaris 8 and Solaris 9 operating environments. Ensure that this executable is located in the /usr/sbin directory before you begin the installation.
Create directory structure /global/dns/named on the cluster file system to hold the DNS configuration files (at level /global/dns) and database files (at level /global/dns/named).
See the Sun Cluster Software Installation Guide for Solaris OS for information on how to set up cluster file systems.
# mkdir -p /global/dns/named
Place the configuration file for DNS, named.conf or named.boot, under the /global/dns directory.
If you have already installed DNS, you can copy the existing named.conf or named.boot file to the /global/dns directory. Otherwise, create a named.conf file in this directory. See the in.named(1M) man page for information on the types of entries to place in named.conf or named.boot. Either the named.conf file or the named.boot file must exist. Both files can exist.
Place all of the DNS database files (listed in the named.conf file) under the /global/dns/named directory.
On all of the clients of Sun Cluster HA for DNS, create an entry for the network resource of the DNS service in the /etc/resolv.conf file.
On all of the nodes, edit the /etc/resolv.conf file to contain the network resource. The following example shows the entries for a four-node configuration (phys-schost-1, phys-schost-2, phys-schost-3, and phys-schost-4) with the logical hostname schost-1.eng.sun.com.
domain eng.sun.com ; schost-1.eng.sun.com (Only entry to be added if the file is already present.) nameserver 22.214.171.124 ; phys-schost-2.eng nameserver 126.96.36.199 ; phys-schost-3.eng nameserver 188.8.131.52 ; phys-schost-4.eng nameserver 184.108.40.206 ; phys-schost-1.eng nameserver 220.127.116.11
Make the network resource the first entry after the domain name. DNS attempts to use the addresses in the order that they are listed in the resolv.conf file to access the server.
If the /etc/resolv.conf is already present on the nodes, just add the first entry that shows the logical hostname in the preceding example. The order of the entries determines the order in which DNS tries to access the server.
On all of the cluster nodes, edit the /etc/inet/hosts file to create an entry for the network resource of the DNS service.
In the following example, perform these steps.
Replace the IPaddress variable with your actual IP address, such as 18.104.22.168.
Replace the logical-hostname variable with your actual network resource (logical hostname or shared address).
127.0.0.1 localhost IPaddress logical-hostname
On all of the cluster nodes, edit the /etc/nsswitch.conf file to add the string dns after cluster and files to the hosts entry.
hosts: cluster files dns
On all of the cluster nodes, test DNS.
The following example shows how to test DNS.
# /usr/sbin/in.named -c /global/dns/named.conf # nslookup phys-schost-1
On all of the cluster nodes, stop DNS.
Be sure to stop the in.named executable before you proceed.
# pkill -x in.named
If you installed the Sun Cluster HA for DNS packages during your Sun Cluster installation, go to Registering and Configuring Sun Cluster HA for DNS. Otherwise, go to Installing Sun Cluster HA for DNS Packages.