The VIP information is stored in OCR (Oracle Cluster Registry) and also in different HA framework. Changing the VIP Address or VIP Hostname involves modification of the nodeapps, which includes the VIP,GSD, Listener, and ONS(Oracle Notification Services).The VIP can be changed while the nodeapps are running, but the changes will take effect only when nodeapps are restated.
Note that stopping nodeapps may cause other resources to be stopped for ex: - ASM, instance or database, so the change should be made during scheduled outage.
Follow the steps to change the VIP address or VIP hostname.
Step 1:- Check the original configuration before change
$ srvctl config nodeapps -n
Using '-a' will give you the current VIP hostname, VIP address and interface
Example:
# srvctl config nodeapps -n testrac01 -a
VIP exists.: /testrac01-vip/10.11.12.01/255.255.255.0/eth0
The VIP Hostname is 'testrac01-vip’
The VIP IP address is '10.11.12.01'
The VIP subnet mask is '255.255.255.0'
The Interface Name used by the VIP is called 'eth0'
Step 2:- Stop Instance,ASM,Nodeapps resources
$srvctl stop instance -d testdb -i tetdb1
$srvctl stop asm -n testrac01
$srvctl stop nodeapps -n testrac01
Step 3:- Verify the VIP Address is no longer running by using below command
$ifconfig -a
You can also check the resources status using crs_stat command.
Step 4:- Update /etc/hosts file with new VIP Address or VIP hostname on node1 and also update DNS to associate the new IP address with VIP hostname as per /etc/hosts file.
Step 5:- Modify VIP Address or VIP hostname on nodeapps by using srvctl command (Run as root)
#srvctl modify nodeapps -n [-o ] [-A ]
Where
-n < node_name> - Node name.
-o
-A The node level VIP address (
Example:- Modify the VIP Address to 10.11.12.11
#srvctl modify nodeapps -n testrac01 -A 10.11.12.11/255.255.255.0/eth0
Use below command to change to change VIP address using VIP hostname.The srvctl command will resolve the IP to hostname or the hostname to IP address. You can use the same command to change the VIP hostname from ”testrac01-vip” to “testrac01-v”
#srvctl modify nodeapps -n testrac01 -A testrac01-v/255.255.255.0/eth0
Step 6:- Verify the change by running below command
$srvctl config nodeapps -n testrac01 –a
Step7:- Start all resources
$srvct start nodeapps -n testrac01
$srvctl start asm -n testrac01
$srvctl start instance -d testdb –i testdb1
Step8:- Repeat the same steps on all remaining nodes in the cluster.
Regards,
Satishbabu Gunukula
http://www.oracleracexpert.com
very useful satti
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