Linux: How to Configure the DNS Server for 11gR2 SCAN
(Doc ID 1107295.1)
Last updated on MARCH 07, 2023
Applies to:Gen 1 Exadata Cloud at Customer (Oracle Exadata Database Cloud Machine) - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Oracle Database Backup Service - Version N/A and later
Oracle Database Cloud Exadata Service - Version N/A and later
Oracle Database Cloud Service - Version N/A and later
The commands listed in this Note tested at Red Hat Enterprise Server 5 Update 2. For the other Linux enviroments it should be similar.
This note explains how to configure the DNS to accommodate SCAN-VIP. In most cases this task is carried out by the Network Administrator, but awareness of these steps can be very useful for assisting your network administrator in configuring DNS properly for SCAN and/or provide the ability to configure DNS in a sandbox enviroment.
If there is no separate DNS Server box available for your test case, you can have one of the cluster nodes (example: rac1 or rac2) also acting as the DNS server. Note, however, that using one of your cluster nodes as your DNS server is not supported in production.
This note will demonstrate how to prepare the SCAN-IP on a Linux DNS Server
When installing Grid Infrastructure, there are 2 options:
1. Configure GNS and let it handle name resolution
2. Choose not to configure GNS and configure each Node and SCAN name with IP addresses defined in DNS
For the purpose of this note, we will not involve GNS (see <Note:946452.1> for how to configure GNS).
The three nodes involved in this case are: rac1, rac2, and dns1. The domain is: testenv.com
Node Name Public IP Private IP VIP IP
rac1.testenv.com 17.xxx.0.1 172.xxx.2.1 192.xxx.2.221
rac2.testenv.com 17.xxx.0.2 172.xxx.2.2 192.xxx.2.222
The target scan-vip name is: rac-scan
rac-scan will be configued with the following 3 IP addresses: 192.xxx.2.11, 192.xxx.2.12, 192.xxx.2.13
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