How To Change The Assigned DNS Server IP Address Post Installation In Exalogic Physical and Virtual Rack Machine

Asset ID:	1-79-1949179.1
Update Date:	2017-11-20
Keywords:

Solution Type Predictive Self-Healing Sure

Solution 1949179.1 : How To Change The Assigned DNS Server IP Address Post Installation In Exalogic Physical and Virtual Rack Machine

Applies to:

Oracle Exalogic Elastic Cloud Software - Version 2.0.0.0.0 and later
Exalogic Elastic Cloud X3-2 Half Rack
Linux x86-64
Oracle Virtual Server (x86-64)

Purpose

This document provides information on how to change the DNS Server IP addresses to a new DNS Server IP Addresses for all the components in an Exalogic Physical or Virtual Rack post installation.

Details

Following is procedure to change the IP address of the DNS server in below components in an Exalogic Virtual Rack. Changes have to be made in the order shown below.

Infiniband Gateway Switches
ZFS Storage Appliance
Compute Nodes
Exlogic Virtual : Guest vServers and Exalogic Control Stack vServers
Cisco Management Switch

Infiniband Gateway Switches

All Infiniband Gateway Switches (if DNS is configured), please follow the procedure as explained in the Document ID : 1669990.1 - How To Configure Exalogic NM2-GW Switches To Be DNS Clients of a DNS Server accessible over the EoIB network

ZFS Storage Appliance

ZFS Storage Appliance (if DNS is configured), please follow the procedure as explained below:

1. Login to the BUI of each storage head, and navigate to Configuration -> Services -> DNS

2. Change the IP Address

For DNS details please review the Sun ZFS Storage 7000 System Administration Guide

Compute Nodes

1. All Compute Nodes : Change the DNS IP Address in /etc/resolv.conf file

Exalogic Virtual

Guest vServers and Exalogic Control Stack vServers

1. All Exalogic Control vServers (ExalogicControl/ExalogicControlOVMM, PC1, PC2) : Change the DNS IP address in /etc/resolv.conf file

2. All Exalogic Guest vServers : Change the DNS IP Addres in /etc/resolv.conf file

Cisco Management Switch

1. Access the switch using SSH, and log in as the admin user with the administrator password.

NOTE

If SSH has not been configured, then use Telnet to access the switch as the admin user.

2. Change to enable mode using the following command. When prompted for a password, use the administrator password.

Switch> enable

3. Review the current configuration using the following command:

Switch# show running-config

4. Erase the current DNS server information using the following commands:

Switch# configure terminal
Enter configuration commands,one per line.End with CNTL/Z.
Switch(config)# no ip name-server 10.7.7.2
Switch(config)# no ip name-server 129.148.5.4
Switch(config)# no ip name-server 10.8.160.2
Switch(config)# end
Switch# write memory
Building configuration...
Compressed configuration from 2603 bytes to 1158 bytes [OK ]

NOTE

Each current DNS IP address to be changed needs to be erased. Invalid IP addresses must also be erased.

5. Configure up to three DNS servers. The following is an example:

Switch# configure terminal
Enter configuration commands,one per line.End with CNTL/Z.
Switch(config)# ip name-server 10.7.7.3
Switch(config)# ip name-server 129.148.5.5
Switch(config)# ip name-server 10.8.160.1
Switch(config)# write memory
Building configuration...
Compressed configuration from 2603 bytes to 1158 bytes [OK ]

6. Verify the changes by running the following command, and reviewing the output:

Switch# show running-config

7. The following is an example of the output from the command:

Building configuration...
...
ip domain-name example.com
ip name-server 192.168.10.2
ip name-server 192.168.10.3
ip name-server 192.168.10.4
...

8. Save the configuration using the following command:

Switch# copy running-config startup-config
Destination filename [startup-config]?
Building configuration...
Compressed configuration from 14343 bytes to 3986 bytes[OK]

9. Exit the session using the following command:

Switch# exit

NOTE

Please note, that no restart is required after the DNS Server IP addresses are changes; these changes should be picked up immediately. However, please ensure that after making the changes on the Compute Node, Exalogic Control vServers, and guest vServers, the changes are tested using nslookup.

References

<NOTE:1669990.1> - How To Configure Exalogic NM2-GW Switches To Be DNS Clients of a DNS Server accessible over the EoIB network
<NOTE:1550602.1> - How To Change Host/Domain Names and IP Addresses For Exalogic Physical Environments

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