How to update the IP address of the SCAN VIP

ygzhou518發表於2012-01-02
How to update the IP address of the SCAN VIP resources (ora.scan.vip) [ID 952903.1]
          Modified 13-AUG-2010     Type HOWTO     Status PUBLISHED  
In this Document
  Goal
  Solution

Applies to:
Oracle Server - Enterprise Edition - Version: 11.2.0.1 to 11.2.0.1 - Release: 11.2 to 11.2
Information in this document applies to any platform.
Goal

The purpose of this document is to explain how to change the IP addresses associated with the SCAN VIPs in a 11gR2 Grid (CRS) environment. 

The IP addresses associated with the SCAN VIP resources are initially set when the SCAN resources are created. 
Any changes to the DNS entry for the SCAN are not automatically propagated to the clusterware and need to be done manually.

This applies only to installations that are not using GNS.

The information in this note can also be helpful in cases where SCAN was originally configured with just one address and is now being expanded to accommodate three IP addresses.
Solution

Before the SCAN VIPs can be changed, the entry for the SCAN name on the Domain Name Server (DNS) needs to be updated with the new IP addresses. This usually will be done by a network administrator. To check the current setting, the following command can be used:
nslookup
To check the current IP address(es) of the SCAN VIPs, run the following commands as the root user:
$GRID_HOME/bin/srvctl config scan
Next refresh the SCAN VIPs with the new IP addresses from the DNS entry:
$GRID_HOME/bin/srvctl modify scan -n

To check if the SCAN VIPs have been changed, run the following command, it should now show the new IP addresses.
$GRID_HOME/bin/srvctl config scan

Below is an example using the following configuration:
The name of the SCAN is sales-scan.example.com
subnet of the public network is 10.100.10.0
netmask for the public network is 255.255.255.0
name of the public interface is eth1
old IP addresses: 10.100.10.81, 10.100.10.82 & 10.100.10.83
new IP addresses: 10.100.10.121, 10.100.10.122 & 10.100.10.123

A lookup of the SCAN on the DNS server shows that the entry has already been updated with the new IP addresses:
$ nslookup sales-scan.example.com 
Server:         dns1.example.com
Address:        10.100.10.70#53

Name:   sales-scan.example.com
Address: 10.100.10.123
Name:   sales-scan.example.com
Address: 10.100.10.122
Name:   sales-scan.example.com
Address: 10.100.10.121

Stop the SCAN listener and the SCAN VIP resources:
# $GRID_HOME/bin/srvctl stop scan_listener
# $GRID_HOME/bin/srvctl stop scan
# $GRID_HOME/bin/srvctl status scan
SCAN VIP scan1 is enabled
SCAN VIP scan1 is not running
SCAN VIP scan2 is enabled
SCAN VIP scan2 is not running
SCAN VIP scan3 is enabled
SCAN VIP scan3 is not running
# $GRID_HOME/bin/srvctl status scan_listener
SCAN Listener LISTENER_SCAN1 is enabled
SCAN listener LISTENER_SCAN1 is not running
SCAN Listener LISTENER_SCAN2 is enabled
SCAN listener LISTENER_SCAN2 is not running
SCAN Listener LISTENER_SCAN3 is enabled
SCAN listener LISTENER_SCAN3 is not running

The SCAN VIP resources still show the old IP addresses:
# $GRID_HOME/bin/srvctl config scan
SCAN name: sales-scan, Network: 1/10.100.10.0/255.255.255.0/eth1
SCAN VIP name: scan1, IP: /sales-scan.example.com/10.100.10.81
SCAN VIP name: scan2, IP: /sales-scan.example.com/10.100.10.82
SCAN VIP name: scan3, IP: /sales-scan.example.com/10.100.10.83

Now tell CRS to update the SCAN VIP resources:
# $GRID_HOME/bin/srvctl modify scan -n sales-scan.example.com

To verify that the change was successful, check the SCAN configuration again:
# $GRID_HOME/bin/srvctl config scan
SCAN name: sales-scan, Network: 1/10.100.10.0/255.255.255.0/eth1
SCAN VIP name: scan1, IP: /sales-scan.example.com/10.100.10.121
SCAN VIP name: scan2, IP: /sales-scan.example.com/10.100.10.122
SCAN VIP name: scan3, IP: /sales-scan.example.com/10.100.10.123

Start SCAN and the SCAN listener:
# $GRID_HOME/bin/srvctl start scan
# $GRID_HOME/bin/srvctl start scan_listener

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