Comments on: Changing Hostnames in Oracle RAC

By: Diego

Diego — Tue, 29 Nov 2011 09:38:41 +0000

Alex,

What are the steps for 11gR2 RAC? I need to change the IP addresses and the domain names.

Thanks,
Diego

By: Paresh

Paresh — Wed, 21 Sep 2011 22:13:56 +0000

Alex,

Thank you, saved a ton of time and efforts.
Here is something additional that needs to be done as part of the hostname change. Re-establish ssh equivalency between nodes (only the part to accept the key) by manually running ssh to other node/s from each node as user oracle.

I ran into this issue because of need to run vipca and also had to manually add the listeners using netca (the hostname was changed by SA before I got a chance to extract .cap files). Thanks to Brian Lucas who posted the tip on a unrelated thread at – https://forums.oracle.com/forums/message.jspa?messageID=9886788#9886788

BTW – I also changed all of the IP addresses successfully.

Thanks,
Paresh

By: Alex Gorbachev

Alex Gorbachev — Thu, 31 Mar 2011 13:26:52 +0000

@INDRANIL: This goes beyond the topic of this post. This is a basic RTFM question.

By: INDRANIL

INDRANIL — Thu, 31 Mar 2011 05:58:58 +0000

Hi Alex,
It was as like-
# Before I read your ARTICLE on “hostname change in CRS”, I had setup a 2 node RAC with host name- rac1 and rac2 and DB Name was LIVE with two instances LIVE1 and LIVE2. This was done using VM Ware in Windows Host. In VM ware, I installed Oracle Linux a flavour from ReD HAT Linux.
In that I did the setup for 2 Virtual nodes rac1 and rac2 and installed CRS, DB etc.
#Now After I read your article, what I did is, I copied the VM nodes rac1, rac2 as windows file system and again get2 node RAC with the same host names as rac1,rac2 and LIVE(LIVE1,LIVE2) as DB.
Then I follow your article and modify the hostnames rac1 , rac2 to rac3, rac4 and modify the DB name LIVE(LIVE1,LIVE2) to STDB(STDB1,STDB2).
# So, Now I am having 4 nodes in VM ware where – there are two RAC VM machines – say – VM1 and VM2.
where VM1 is of 2 rac nodes- rac1,rac2
DB Name= LIVE ( LIVE1, LIVE2)
AND
VM2 is of 2 rac nodes – rac3, rac4
DB Name = STDB (STDB1,STDB2).
# Now, I need help from you to setup the DATA Guard using those as -
Primary Database – LIVE ( LIVE1(rac1),LIVE2(rac2))
and Stand By Database as STDB ( STDB1(rac3),STDB(rac4).
This was my query to you.
Thanks again
INDRANIL,IBM,INDIA,9433056179,indrdas2@gmail.com

By: Alex Gorbachev

Alex Gorbachev — Wed, 30 Mar 2011 15:58:29 +0000

@INDRANIL: I couldn’t quite understand what you are asking and I’m not sure what it has to do with the hostname changes.

By: INDRANIL

INDRANIL — Wed, 30 Mar 2011 08:50:06 +0000

Hi Alex,
The above article is execellent! I was able to derive in VM Ware , a 2 node RAC – STDB1 instance is running in node rac3 ,STDB2 is running in rac4 from a 2 node RAC – instance LIVE1 in rac1 , LIVE2 instance in LIVE2. Now, I want to use those as like LIVE ( LIVE1(rac1),LIVE2(rac2) ) – Primary Database and STDB ( STDB1(rac3),STDB2(rac4)… Alex, could you please hlep me for that ? Thanks in Advance, INDRANIL,IBM,INDIA

By: Joaquin

Joaquin — Fri, 04 Mar 2011 22:12:45 +0000

Hi Alex

One of our clients wants to change the hostname of the machine only but of course this will imply changing as well the Oracle RAc hostnames (even though I left the old ones in the /etc/hosts). The commands that you execute will NOT erase any of the onformation store on the database right?

By: Oracle Notes » How to Clean Up After a Failed 10g or 11.1 Oracle Clusterware Installation

Thu, 29 Apr 2010 12:19:59 +0000

[...] To Change RAC hostname Please review this Note [...]

By: Alex Gorbachev

Alex Gorbachev — Sat, 13 Mar 2010 03:59:02 +0000

@monto: I wouldn’t rely on this for DR. It makes DR activation very convoluted process. A more reliable approach is to only replicate database and have clusterware ready pre-installed and functioning.

By: monto

monto — Fri, 12 Mar 2010 15:58:43 +0000

Alex-Thanks for this wonderful article,i got a question.We have OS imaging/SAN sync(srdf) from an already existing cluster(rac1/rac2) to another cluster called as node1/node2,the hostnames are different along with the ip’s between them,i have made respective changes in DNS and /etc/hosts and ran roodelete.sh on both nodes and rootdeinstall.sh on primary node.

I changed the hostname in rootconfig file on both nodes,can i run root.sh instead of rootconfig?I’m i on the right tract please let me as this is my first time with this..

Thanks