How to create Virtual Hostname

[joseph51]

Hi..
Please some some tell me how to create a virtual hostname for a server .
Here we have SAP systems . And I could see that there are two hostname for this server. but The virtual hostname uses the actual package IP . But I could not find where the virtual hostname is defined .The entry I could found only in /etc/hosts file
Some one please tell me

[Zinky]

The virtual IP of the package will not be in the system but will be in your cluster's.

Say your main LAN is lan900, to start a Virtual IP :

ifconfig lan900:1 ipaddr netmask nm

lan900:1 - means it will be the first VIP
lan900:2 - second... and so on...


In my Poor Man's Clustering recipe (which essentially mimics ServiceGuard via scripts) -- plumbing up of a "package"'s virtual hostname/ip follows the above syntax.

[joseph51]

Hi.

My system is not having APA . Instead of lan1:1 is carrying the IP for the virtual IP . But there is a separate hostname for this IP . How we will create this hostname .Also there is actual physical hostname that is configured with diff IP in lan1

[Zinky]

Irregardless of the LAN interface, APA or not- the IP is defined or plumbed using the above syntax.

How/Where it is defined -- it should be in the clusert/package configuration files.. /etc/cmcluster

urely you have a ServiceGuard person on board - no?

[Rita C Workman]

A moment please - where in the original post did he mention Service Guard.

I am not a SAP person, but I do that in certain kinds of Oracle software it can create/set itself up with a "virtual name" when it installs on a server. Unfortunately, Oracle liked to grab the actual name of the server and use this for it's 'virtual name'. Looks like SAP grabs the 'IP' from what you describe.

So....what I found in this kind of a situation was that it was controlled by some setting in a configuration file *within* the oracle files it loaded.
So I might start looking under the covers of SAP to try and find a configuration file with that info in it.

But if it's anything like Oracle - it's in multiple places and may not be worth trying to fix it yourself.

At least...that was my take on what you mentioned, but maybe I read it wrong.

Rgrds,
Rita

[joseph51]

Thanks for all for the response

[joseph51]

Thanks