RAC privet interconnect IP address change

Oracle RAC user isolate network connectivity for privet interconnect.
Bellow steps will describe how to change privet interconnect.

Make sure full cluster or service downtime


Step 1: Determine current private IP address

[grid@rac1 ~]$ oifcfg getif
eth0  192.168.20.0  global  public
eth1  10.0.0.0  global  cluster_interconnect

Step 2: Determine current configure Ethernet/NIC card name

[grid@rac1 ~]$ oifcfg iflist
eth0  192.168.20.0
eth1  10.0.0.0

Step 3: Add new interface Subnet ID:

[grid@rac1 ~]$ oifcfg setif -global eth1/172.20.0.0:cluster_interconnect

Step 4 : Verify the modification:

[grid@rac1 ~]$ oifcfg getif
eth0  192.168.20.0  global  public
eth1  10.0.0.0  global  cluster_interconnect
eth1  172.20.0.0  global  cluster_interconnect

Step 5: Stop cluster on all node:

[grid@rac1 ~]# su - root
[root@rac1 ~]# cd /u01/app/11.2.0/grid/bin/
[root@rac1 ~]#  ./crsctl stop cluster -all

Step 6: Modify netwrok address on network adapter of each box:

[root@rac1 ~]# ifconfig eth1 172.20.0.10 netmask 255.255.0.0 broadcast 172.20.255.255
[root@rac2 ~]# ifconfig eth1 172.20.0.11 netmask 255.255.0.0 broadcast 172.20.255.255

Step 7: Change /etc/hosts file on each node.

[root@rac1 ~]# cat /etc/hosts
# Do not remove the following line, or various programs
# that require network functionality will fail.
127.0.0.1    localhost.localdomain    localhost

#10.10.10.10       rac1-priv
172.16.0.10        rac1-priv

#10.10.10.11   rac2-priv
172.20.0.11    rac2-priv

Step 8: Start cluster all node

[grid@rac1 ~]# su - root
[root@rac1 ~]# cd /u01/app/11.2.0/grid/bin/
[root@rac1 ~]#  ./crsctl start cluster -all

Step 9: Remove old private interconnect entry from cluster registry

[grid@rac1 ~]$ oifcfg delif -global eth1/10.0.0.0:cluster_interconnect

Step 10: Verify the changes:

[grid@rac1 ~]$ oifcfg getif
eth0  192.168.20.0  global  public
eth1  172.20.0.0  global  cluster_interconnect

[grid@rac1 ~]$ ping rac1-priv
PING test1-priv.localdomain (172.20.0.10) 56(84) bytes of data.
64 bytes from test1-priv.localdomain (172.20.0.10): icmp_seq=1 ttl=64 time=0.026 ms
64 bytes from test1-priv.localdomain (172.20.0.10): icmp_seq=2 ttl=64 time=0.018 ms