VIP FAILOVER DEMONSTRATION

Recently, a student of mine wanted me to demonstrate failover of VIP.

Here is the demonstration:

Current scenario:

2 node 11.2.0.1 RAC cluster with SCAN and GNS

nodes : host01, host02

Overview:

– check that VIP’s of both the nodes are running on respective nodes

— Stop clusterware on host01

— check that VIP of host01  has failed over to host02

— Trace route of request to connect  to VIP of host01 and verify that connection is not made as listener on host02 accepts requests    to its own VIP only

— Trace route of request to connect  to VIP of host02 and verify  that connection is made  as listener on host02 accepts requests    to host02’s VIP

— start clusterware on host01

— check that host01 vip is running on host01 again

— Trace route of request to connect  to VIP of host01 and verify that connection is made  as listener on host01 accepts requests   to its own  VIP

Implementation :

- check that VIP’s of both the nodes are running on respective nodes

[root@host02 ~]# srvctl status nodeapps -n host01

VIP 192.9.201.247 is enabled
VIP 192.9.201.247 is running on node: host01
Network is enabled
Network is running on node: host01

[root@host02 ~]# srvctl status nodeapps -n host02

VIP 192.9.201.235 is enabled
VIP 192.9.201.235 is running on node: host02
Network is enabled
Network is running on node: host02

- Stop clusterware on host01

[root@host01 ~]# crsctl stop crs

- check that VIP of host01 (192.9.201.247) has failed over to host02

[root@host02 ~]# srvctl status nodeapps -n host01

VIP 192.9.201.247 is enabled
VIP 192.9.201.247 is running on node: host02
Network is enabled
Network is not running on node: host01

– Trace route of request to connect  to VIP of host01 i.e. 192.9.201.147
– It can be seen there is no listener as listener on host02 accepts requests    to host02’s VIP (192.9.201.235) only

[root@host02 ~]# trcroute 192.9.201.247

Route of TrcRoute:
------------------

Node: Client            Time and address of entry into node:
-------------------------------------------------------------
08-JAN-2014 14:14:39 ADDRESS= PROTOCOL=TCP  HOST=192.9.201.247  PORT=1521

TNS-12224: TNS:no listener
TNS-12541: TNS:no listener
TNS-12560: TNS:protocol adapter error
TNS-03601: Failed in route information collection

– Trace route of request to connect  to VIP of host02 i.e. 192.9.201.235
– It can be seen that connection is made  as listener on host02 accepts requests    to host02’s VIP

[root@host02 ~]# trcroute 192.9.201.235

Route of TrcRoute:
------------------

Node: Client            Time and address of entry into node:
-------------------------------------------------------------
08-JAN-2014 14:14:51 ADDRESS= PROTOCOL=TCP  HOST=192.9.201.235  PORT=1521

Node: Server            Time and address of entry into node:
-------------------------------------------------------------
08-JAN-2014 14:14:52 ADDRESS= PROTOCOL=TCP  HOST=192.9.201.235  PORT=1521

– start clusterware on host01

[root@host01 ~]# crsctl start crs

– check that host01 vip (192.9.201.147) is running on host01 again

[root@host02 ~]# srvctl status nodeapps -n host01

VIP 192.9.201.247 is enabled
VIP 192.9.201.247 is running on node: host01
Network is enabled
Network is running on node: host01

– Trace route of request to connect  to VIP of host01 i.e. 192.9.201.247
– It can be seen that connection is made  as listener on host01 accepts requests   to its own  VIP

[root@host02 ~]# trcroute 192.9.201.247

Route of TrcRoute:
------------------

Node: Client            Time and address of entry into node:
-------------------------------------------------------------
08-JAN-2014 14:23:00 ADDRESS= PROTOCOL=TCP  HOST=192.9.201.247  PORT=1521

Node: Server            Time and address of entry into node:
-------------------------------------------------------------
08-JAN-2014 14:23:00 ADDRESS= PROTOCOL=TCP  HOST=192.9.201.247  PORT=1521

I hope this post was useful.

Your comments and suggestions are always welcome.

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