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Sun Cluster 3.1 Data Service for Domain Name Service (DNS) Guide

How to Install DNS

  1. Become superuser on a cluster member.

  2. 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 3.1 Concepts Guide document for details on network resources.

  3. Ensure that the DNS executable (in.named) is in the directory /usr/sbin.

    The DNS executable is bundled with the Solaris 8 operating environment and is located in the /usr/sbin directory before you begin the installation.

  4. Create directory structure /global/dns/named on the cluster file system to hold the DNS configuration and database files.

    See the Sun Cluster 3.1 Software Installation Guide for information on how to set up cluster file systems.


    # mkdir -p /global/dns/named

  5. Place the configuration file for DNS, named.conf or named.boot, under the /global/dns/named directory.

    If you have already installed DNS, you can copy the existing named.conf or named.boot file to the /global/dns/named 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. One of the two files, named.conf or named.boot, must exist. Both files can exist.

  6. Place all of the DNS database files (listed in the named.conf file) under the /global/dns/nameddirectory.

  7. 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 192.29.72.90
 
; phys-schost-2.eng
nameserver 129.146.1.151
 
; phys-schost-3.eng
nameserver 129.146.1.152
 
; phys-schost-4.eng
nameserver 129.144.134.19
 
; phys-schost-1.eng
nameserver 129.144.1.57

    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.

    Note –

    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.

  8. 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 129.146.87.53.

    • Replace the logical-hostname variable with your actual network resource (logical hostname or shared address).


    127.0.0.1						localhost
IPaddress						logical-hostname

  9. 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.

    Example:


    hosts:		 	cluster files dns

  10. Run the scswitch(1M) command to complete the following tasks.

    • Enable the resource and fault monitoring.

    • Move the resource group into a MANAGED state.

    • Bring the resource group online.


    # scswitch -Z -g resource-group
    -Z

    Enables the resource and monitor, moves the resource group to the MANAGED state, and brings the resource group online.

    -g resource-group

    Specifies the name of the resource group.

  11. Test DNS.

    Be sure to stop the in.named executable before you proceed. The following example shows how to test DNS.


    # cd /global/dns
# /usr/sbin/in.named -c /global/dns/named.conf
# nslookup phys-schost-1
# pkill -x /usr/sbin/in.named

Where to Go From Here

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.