Public VIP Address: An interface that can be used for communication with components external to Oracle RAC instances, such as Oracle Net and Virtual Internet Protocol (VIP) addresses.
We can change VIP with any outage. We will change it node by node.

Step 1: Check which service is running on current which VIP , we want to change
[oracle@test1 ~]$ srvctl status service -s <database>
[oracle@test1 ~]$ srvctl status service -d orcl
Service dev is running on instance(s) orcl1
Service taxi is running on instance(s) orcl1
Service web is running on instance(s) orcl1

Step 2: Stop these services
[oracle@test1 ~]$ srvctl stop service -d <DB_NAME> -s <Service_name1,Service_name2> -n <hostname>

[oracle@test1 ~]$ srvctl stop service -d orcl -s dev,taxi,web -n test1

Step 3: Find VIP address:
[oracle@test1 ~]$ srvctl config vip -n <host_name>
[oracle@test1 ~]$ srvctl config vip -n test1
VIP exists: /test1-vip/192.168.1.106/192.168.1.0/255.255.255.0/eth0, hosting node test1

Step 4: Stop VIP of current node
[oracle@test1 ~]$ srvctl stop vip -n <host_name>
[oracle@test1 ~]$ srvctl stop vip -n test1
PRCR-1014 : Failed to stop resource ora.test1.vip
PRCR-1065 : Failed to stop resource ora.test1.vip
CRS-2529: Unable to act on ‘ora.test1.vip’ because that would require stopping or relocating ‘ora.LISTENER.lsnr’, but the force option was not specified.

CRS-2529: There is some dependent services on VIP of this node.

Stop VIP forcefully on this node.

[oracle@test1 ~]$ srvctl stop vip -n test1 -f

(-f :: forcefully)

Step 5: Verify VIP is down:

[oracle@test1 ~]$
[oracle@test1 ~]$ /sbin/ifconfig -a | egrep ‘(eth0|Mask)’
eth0 Link encap:Ethernet HWaddr 00:0C:29:39:72:AD
inet addr:192.168.1.105 Bcast:192.168.1.255 Mask:255.255.255.0
inet addr:172.16.0.10 Bcast:172.16.255.255 Mask:255.255.0.0
inet addr:169.254.250.202 Bcast:169.254.255.255 Mask:255.255.0.0
inet addr:127.0.0.1 Mask:255.0.0.0

Step 6: Modify VIP
[oracle@test1 ~]$ srvctl modify nodeapps -n test1 -A 192.168.1.115/255.255.255.0/eth0

Step 7: Make changes into /etc/hosts file on all nodes and domain name server,
New IP address with their respective host name.

Step 8: Start VIP

[oracle@test1 ~]$ srvctl start vip -n test1

Step 8: Verify VIP
[oracle@test1 ~]$ /sbin/ifconfig -a | egrep ‘(eth0|Mask)’
eth0 Link encap:Ethernet HWaddr 00:0C:29:39:72:AD
inet addr:192.168.1.105 Bcast:192.168.1.255 Mask:255.255.255.0
eth0:1 Link encap:Ethernet HWaddr 00:0C:29:39:72:AD
inet addr:192.168.1.115 Bcast:192.168.1.255 Mask:255.255.255.0
inet addr:172.16.0.10 Bcast:172.16.255.255 Mask:255.255.0.0
inet addr:169.254.250.202 Bcast:169.254.255.255 Mask:255.255.0.0
inet addr:127.0.0.1 Mask:255.0.0.0

Step 9: Start dependent services
[oracle@test1 ~]$ srvctl start service -d orcl -s dev,taxi,web

Check services status
[oracle@test1 ~]$ srvctl status service -d orcl -s dev,taxi,web
Service dev is running on instance(s) orcl1
Service taxi is running on instance(s) orcl1
Service web is running on instance(s) orcl1

Step 10: Repeat step-1 to step-9 on the other nodes.

Step 11: Verify Node connectivity between all nodes:
[oracle@test1 ~]$ cluvfy comp nodecon -n all -verbose
Verifying node connectivity
Checking node connectivity…
Checking hosts config file…
Node Name     Status                    Comment
———— ———————— ————————
test2         passed
test1         passed
Verification of the hosts config file successful
Interface information for node “test2″
Name   IP Address      Subnet          Gateway         Def. Gateway    HW Address        MTU
—— ————— ————— ————— ————— —————– ——
eth0   192.168.1.107   192.168.1.0     0.0.0.0         192.168.1.1     00:0C:29:39:72:AD 1500
eth0   192.168.1.116   192.168.1.0     0.0.0.0         192.168.1.1     00:0C:29:39:72:AD 1500
eth1   172.16.0.11     172.16.0.0      0.0.0.0         192.168.1.1     00:0C:29:39:72:B7 1500
eth1   169.254.250.202 169.254.0.0     0.0.0.0         192.168.1.1     00:0C:29:39:72:B7 1500
Interface information for node “test1″
Name   IP Address      Subnet          Gateway         Def. Gateway    HW Address        MTU
—— ————— ————— ————— ————— —————– ——
eth0   192.168.1.105   192.168.1.0     0.0.0.0         192.168.1.1     00:0C:29:F9:B9:1C 1500
eth0   192.168.1.109   192.168.1.0     0.0.0.0         192.168.1.1     00:0C:29:F9:B9:1C 1500
eth0   192.168.1.115   192.168.1.0     0.0.0.0         192.168.1.1     00:0C:29:F9:B9:1C 1500
eth1   172.16.0.10     172.16.0.0      0.0.0.0         192.168.1.1     00:0C:29:F9:B9:26 1500
eth1   169.254.41.177 169.254.0.0     0.0.0.0         192.168.1.1     00:0C:29:F9:B9:26 1500
Check: Node connectivity of subnet “192.168.1.0”
Source                          Destination                     Connected?
—————————— —————————— —————-
test2[192.168.1.107]            test2[192.168.1.116]            yes
test2[192.168.1.107]            test1[192.168.1.105]            yes
test2[192.168.1.107]            test1[192.168.1.109]            yes
test2[192.168.1.107]            test1[192.168.1.115]            yes
test2[192.168.1.116]            test1[192.168.1.105]            yes
test2[192.168.1.116]            test1[192.168.1.109]            yes
test2[192.168.1.116]            test1[192.168.1.115]            yes
test1[192.168.1.105]            test1[192.168.1.109]            yes
test1[192.168.1.105]            test1[192.168.1.115]            yes
test1[192.168.1.109]            test1[192.168.1.115]            yes
Result: Node connectivity passed for subnet “192.168.1.0” with node(s) test2,test1
Check: TCP connectivity of subnet “192.168.1.0”
Source                          Destination                     Connected?
—————————— —————————— —————-
test1:192.168.1.105             test2:192.168.1.107             passed
test1:192.168.1.105             test2:192.168.1.116             passed
test1:192.168.1.105             test1:192.168.1.109             passed
test1:192.168.1.105             test1:192.168.1.115             passed
Result: TCP connectivity check passed for subnet “192.168.1.0”
Check: Node connectivity of subnet “172.16.0.0”
Source                          Destination                     Connected?
—————————— —————————— —————-
test2[172.16.0.11]              test1[172.16.0.10]              yes
Result: Node connectivity passed for subnet “172.16.0.0” with node(s) test2,test1
Check: TCP connectivity of subnet “172.16.0.0”
Source                          Destination                     Connected?
—————————— —————————— —————-
test1:172.16.0.10               test2:172.16.0.11               passed
Result: TCP connectivity check passed for subnet “172.16.0.0”
Check: Node connectivity of subnet “169.254.0.0”
Source                          Destination                     Connected?
—————————— —————————— —————-
test2[169.254.250.202]          test1[169.254.41.177]           yes
Result: Node connectivity passed for subnet “169.254.0.0” with node(s) test2,test1
Check: TCP connectivity of subnet “169.254.0.0”
Source                          Destination                     Connected?
—————————— —————————— —————-
test1:169.254.41.177            test2:169.254.250.202           passed
Result: TCP connectivity check passed for subnet “169.254.0.0”
Interfaces found on subnet “192.168.1.0” that are likely candidates for VIP are:
test2 eth0:192.168.1.107 eth0:192.168.1.116
test1 eth0:192.168.1.105 eth0:192.168.1.109 eth0:192.168.1.115

Interfaces found on subnet “169.254.0.0” that are likely candidates for VIP are:
test2 eth1:169.254.250.202
test1 eth1:169.254.41.177

Interfaces found on subnet “172.16.0.0” that are likely candidates for a private interconnect are:
test2 eth1:172.16.0.11
test1 eth1:172.16.0.10

Result: Node connectivity check passed

Verification of node connectivity was successful.

How to change Public VIP Address in 11gR2 RAC

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