How to deallocate alias service IP on AIX hacmp cluster.
Scenario:
we had request for deallocation of service IP from AIX hacmp node and assign that same IP on Linux platform server.
So here application team moving there app from AIX to Linux so they want same IP address which is currently assigned on AIX hacmp node.
Solution :
How we can deallocate service IP from AIX hacmp node, answer to this query is simply bring down resource group to which service IP belong.
Steps followed for doing this activity:
IP address befor bringing down resource group
root@:/root : ifconfig -a
en0: BROADCAST,NOTRAILERS,RUNNING,SIMPLEX,MULTICAST,GROUPRT,64BIT,CHECKSUM_OFFLOAD(ACTIVE),LARGESEND,CHAIN>
inet 192.168.1.XX netmask broadcast
inet
10.1.XXX.XXX netmask broadcast
tcp_sendspace 262144 tcp_recvspace 262144 rfc1323 1
Here service IP is
10.1.XXX.XXX , so we need to bring down 10.1.XXX.XXX.
Step 1:
root@/root : clRGinfo
--------------------------------------------------------------------------------------
Group Name Group State Node
---------------------------------------------------------------------------------------
rg_app1 ONLINE node1 // IP is in rg_app1 Resource group
OFFLINE node2
Step 2:
Stop resource group using
smitty clstop
Stop Cluster Services
Type or select values in entry fields.
Press Enter AFTER making all desired changes.
[Entry Fields]
* Stop now, on system restart or both now +
Stop Cluster Services on these nodes [
node1] +
BROADCAST cluster shutdown? false +
* Select an Action on Resource Groups
Bring Resource Groups Offline
Step 3:
once stopped confirm uing following command
root@/root : clRGinfo
--------------------------------------------------------------------------------------
Group Name Group State Node
---------------------------------------------------------------------------------------
rg_app1 OFFLINE node1 // here rg_app1 is OFFLINE.
OFFLINE node2
Step 4:
After resource group offline alias IP also got deallocated from interface en0.
if you observed ifconfig -a ouput you will see that alias service IP down after Resource group stop.
root@:/root : ifconfig -a
en0: BROADCAST,NOTRAILERS,RUNNING,SIMPLEX,MULTICAST,GROUPRT,64BIT,CHECKSUM_OFFLOAD(ACTIVE),LARGESEND,CHAIN>
inet 192.168.1.XX netmask broadcast
What about non-hacmp AIX server , in that situation you need to bring down AIX host or other option is bring down that interface from HMC console.
why HMC console ??
Because after interface down AIX admin also able to access AIX LPAR, but if admin using putty ssh seesion then after interface down then server
will be not reachable from putty ssh. It will only accessible from HMC console.
Thanks !!!!
