topic ip/subnet change in Operating System - HP-UX

ip/subnet change

brian_31 — Tue, 12 Oct 2004 16:55:59 GMT

Team:

We are running a single node cluster configuration on 11.0. we have to change the ip-address and the subnet on the machine. here is what i am planning to do. Please let me know if this is correct.

1. edit the /etc/rc.config.d/cmcluster and change it to 0
2. make the changes to the cluster ascii file for subnet and pkg script for ip and lan failover
3. run /sbin/set_parms initial and make changes for ip and gateway info
4. after reboot try to bring the cluster manually (will the ip change trigger a new binary requirement?)

I think i will have to compile the SG binary after the ip change.

Please confirm if the above steps are correct or I am missing something?

Thanks

Brian.

Re: ip/subnet change

Sridhar Bhaskarla — Tue, 12 Oct 2004 17:02:23 GMT

Hi Brian,

YOu will have to run 'cmapplyconf' for both cluster and each package where the IP changes are made.

Make sure the changes are in effect (using the tools ifconfig,nslookup,ping etc.,) before you apply the configuration.

-Sri

Re: ip/subnet change

brian_31 — Tue, 12 Oct 2004 17:10:16 GMT

Sridhar:

I thought so too. But actually i will be making the changes today but it will take 48 hours for the dns changes to take effect for the new ip's. How should that affect the SG.
Thanks

Brian

Re: ip/subnet change

Sridhar Bhaskarla — Tue, 12 Oct 2004 17:16:46 GMT

Hi Brian,

SG won't be affected as long as your 'nsswitch' policy is set to 'files' first followed by DNS etc., and your /etc/hosts is up-to-date with all the interfaces (in the *cluster*) specified with correct names.

However, if the clients connecting to your application use the DNS names, then it may impact the application.

Ask your DNS team to make changes immediately. We too get into this trouble where you can't afford to wait for 2 days for DNS changes.

-Sri