Change IP address for Oracle RAC

Oringial from http://zhefeng.wordpress.com/2009/02/02/change-ip-address-for-oracle-rac-public-and-vip-interfaces/
1. Current Environment
 1). Machine IP:
 Node1: vmrac01
 Node2: vmrac02
## eth1-Public
 10.50.96.101 vmrac01 vmrac01.test.com
 10.50.96.102 vmrac02 vmrac02.test.com
 ## eth0-Private
 192.168.199.1 vmracprv01 vmracprv01.test.com
 192.168.199.2 vmracprv02 vmracprv02.test.com
 ## VIP
 10.50.96.103 vmracvip01 vmracvip01.test.com
 10.50.96.104 vmracvip02 vmracvip02.test.com

2). cluster information:
 cluster name – vm10cls
 database name – v10c
 Instance 1 – v10c1
 Instance 2 – v10c2
 Node1 – vmrac01
 Node2 – vmrac02
2. New IP changing map(different subnet mask too):
 10.50.96.101/255.255.255.0 vmrac01 –> 10.50.99.41/255.255.252.0
 10.50.96.102/255.255.255.0 vmrac02 –> 10.50.99.42/255.255.252.0
 10.50.96.103/255.255.255.0 vmracvip01 –> 10.50.99.43/255.255.252.0
 10.50.96.104/255.255.255.0 vmracvip02 –> 10.50.99.44/255.255.252.0

3. steps 1 — change RAC IP settings
 1). bring service down, make sure everything was offline except css daemon
 bash-3.1$ srvctl stop database -d v10c
 bash-3.1$ srvctl stop nodeapps -n vmrac01
 bash-3.1$ srvctl stop nodeapps -n vmrac02
 bash-3.1$ crs_stat -t
 Name Type Target State Host
 ————————————————————
 ora.v10c.db application OFFLINE OFFLINE
 ora….c1.inst application OFFLINE OFFLINE
 ora….c2.inst application OFFLINE OFFLINE
 ora….SM1.asm application OFFLINE OFFLINE
 ora….01.lsnr application OFFLINE OFFLINE
 ora….c01.gsd application OFFLINE OFFLINE
 ora….c01.ons application OFFLINE OFFLINE
 ora….c01.vip application OFFLINE OFFLINE
 ora….SM2.asm application OFFLINE OFFLINE
 ora….02.lsnr application OFFLINE OFFLINE
 ora….c02.gsd application OFFLINE OFFLINE
 ora….c02.ons application OFFLINE OFFLINE
 ora….c02.vip application OFFLINE OFFLINE

2). backup OCR and Voting disks
 bash-3.1$ ocrcheck|grep -i file
 Device/File Name : /dev/raw/raw1
 bash-3.1$ crsctl query css votedisk
 0. 0 /dev/raw/raw2
 located 1 votedisk(s).

#dd if=/dev/raw/raw1 of=/database/temp/ocr_vote_bk/ocr.bak
 #dd if=/dev/raw/raw2 of=/database/temp/ocr_vote_bk/vote.bak

3). get current config:
 bash-3.1$ oifcfg getif
 eth0 10.50.96.0 global public –current network for public
 eth1 192.168.199.0 global cluster_interconnect –we are not going to change this

4). delete current public ip:
 bash-3.1$ oifcfg delif -global eth0

5). change to new network:
 bash-3.1$ oifcfg setif -global eth0/10.50.99.0:public

6). change vip address:
 a. check current one
 bash-3.1$ srvctl config nodeapps -n vmrac01 -a
 VIP exists.: /vmracvip01/10.50.96.103/255.255.255.0/eth0
 bash-3.1$ srvctl config nodeapps -n vmrac02 -a
 VIP exists.: /vmracvip02/10.50.96.104/255.255.255.0/eth0
 b. Modify VIP component (has to be the css owner, “root” usually)
 #srvctl modify nodeapps -n vmrac01 -A 10.50.99.43/255.255.252.0/eth0
 #srvctl modify nodeapps -n vmrac02 -A 10.50.99.44/255.255.252.0/eth0
 c. double verify the changes
 bash-3.1$ srvctl config nodeapps -n vmrac01 -a
 VIP exists.: /vmracvip01/10.50.99.43/255.255.252.0/eth0
 bash-3.1$ srvctl config nodeapps -n vmrac02 -a
 VIP exists.: /vmracvip02/10.50.99.44/255.255.252.0/eth0

7). change the hosts file(on both nodes):
 ## eth1-Public
 10.50.99.41 vmrac01 vmrac01.test.com
 10.50.99.42 vmrac02 vmrac02.test.com
 ## eth0-Private
 192.168.199.1 vmracprv01 vmracprv01.test.com
 192.168.199.2 vmracprv02 vmracprv02.test.com
 ## VIP
 10.50.99.43 vmracvip01 vmracvip01.test.com
 10.50.99.44 vmracvip02 vmracvip02.test.com

8). if the listener is using any IP address, it also needs to be changed.

4. Steps 2 — change OS IP settings
 1). change IP
 [root@vmrac01]# vi /etc/sysconfig/network-scripts/ifcfg-eth0
 DEVICE=eth0
 BOOTPROTO=static
 IPADDR=10.50.99.41
 NETMASK=255.255.252.0
 HWADDR=00:50:56:BD:05:14
 ONBOOT=yes

[root@vmrac02]# vi /etc/sysconfig/network-scripts/ifcfg-eth0
 DEVICE=eth0
 BOOTPROTO=static
 IPADDR=10.50.99.42
 NETMASK=255.255.252.0
 HWADDR=00:50:56:BD:3E:08
 ONBOOT=yes

2). change the default gateway on both nodes (if needed, here since they are in same vlan so i didn’t change them)
 [root@vmrac01 ~]# cat /etc/sysconfig/network
 NETWORKING_IPV6=yes
 HOSTNAME=vmrac01
 NETWORKING=yes
 NISDOMAIN=nis
 GATEWAY=10.50.96.1 <– here is the default gateway to be changed

3) Change the IP Address’es on the known_hosts ssh config files for oracle user
 $ su – oracle
 $ cd .ssh
 $ cp known_hosts known_hosts.bak
 $ modify the old IP’s to the new IP’s

4). restart network (on both node)
 #service network restart

5). restart crs daemon (on both node)
 #crsctl stop crs
 #crsctl start crs

5. Step3 — verify everything

reference:
 1. "How to Change Interconnect/Public Interface IP or Subnet in Oracle Clusterware", Doc ID: 283684.1
 2. "Modifying the VIP or VIP Hostname of a 10g or 11g Oracle Clusterware Node", DOC ID: 276434.1
 3. "How to change Public and VIP component address in case of RAC?" http://orcl-experts.info/index.php?name=FAQ&id_cat=9