Forums | Aggregator | Books | Industry News | Firefox Plugins | Social | Links

Comments

DNS Configuration for the SCAN used with Oracle RAC Database 11g Release 2 - A basic description of the DNS configuration required for the SCAN associated with an Oracle RAC database in 11g Release 2.



ron chennells said...

nice one Tim very useful addition to the site

Kabbo said...

Hi Tim,
On a Christmas day, troubleshooting RAC, ah ? How is that for a Christmas? Any how, nice article as usual. But, I have two questions in your article:
one, is 192.168.27 in your /etc/resolv.conf file the address of your ISP DNS server or it is your local DNS server? Second, in this line:
@ IN SOA maggie.localdomain. root.maggie.localdomain. ( 2

is maggie the name of what? and what is this "2" doing there all by itself?

P.S. my "nslookup" deos not resolve despite the fact that I followed this article throughly.

thanks,
Kabbo

Kabbo said...

Sorry Tim,

I meant to say for your DNS server, 192.168.2.7 and not 192.168.27.

thanks,
Kabbo

Tim... said...

Hi.

The DNS server is the one I'm setting up here. Not the ISP DNS because that knows nothing about the RAC.

The maggie.localdomain is the name of the server running the DNS.

Cheers

Tim...

Kabbo said...

Hi Tim,

Under the option section, you have this: forwarders { 192.168.2.1; };, which you say is the address of your ADSL router.

I have put on my server as "forwarders { 192.168.1.1; };" which is the address of my router which is the same as the address of my ISP DHCP server. This suggest to me that I am running DHCP server on my router. It that going to make a difference?

if 192.168.2.7 is the address of your local DNS in your /etc/resolv.conf file, can I put this 192.168.1.130 on my /etc/resolv.conf so log as it is not used by any machine, as my local DNS address?

thanks,
Kabbo


Tim... said...

Hi.

If you have any more question please ask them in the forum. These comments are not for questions, just people mentioning typos than stuff like that. The forum is a much better place to ask questions.

My router (192.168.2.1) acts like a DNS for my internal network. If I specify it as the DNS, in redirects to the ISPs DNS. If I onlt had one machine on my internal network I would not bother with additional DNS.

Don't understand you DHCP comment.

If you are saying your ISP has a DHCP of 192.168.1.1, then it is unlikely any 192.168.1.x will be available for use. Saying that, I really don;t believe your ISP is using a 192.168.1.x address for your connection so I think you are mistaken.

Remember, forum for questions...

Cheers

Tim...

Steve Harville said...

Thank you Tim. It had been several years since I set up a DNS from scratch and this helped a lot.

Oscar said...

I cant see to get the reverse lookup working. Forward lookup works. I'm using fx.com as my domain name. Any help on what the reverse look should be?
-
I'm getting the error;
-
**server can't find 131.1.168.192.in-addr.arpa.:NXDOMAIN
###
Can I ignore this for the RAC installation

Tim... said...

Hi.

What does the big red writing say?

Post your question in the forum and I'll take a look. You should post your current config also.

Cheers

Tim...

Jim said...

In your OL6 named.conf example - you may want to change the allow-query entry. It's set to localhost. Either comment this line out or change it to 'any' to allow other hosts to query the name server.

Tim... said...

Hi.

Thanks for the heads-up. I've corrected that now.

Cheers

Tim...

Orac. User said...

Hey I just wanted to add that if the reverse dns gives anyone any problems then they should check the permissions with the in-addr.arpa file. I kept getting SERVFAIL and it seemed the in-addr.arpa file was getting denied permission. Just a heads up for anyone with the same problem.

Frank/2 said...

Thank's so much for this article!
I had to set up a DNS basap and your article saved me a lot of digging through man pages.

reco said...

Nice !

Arvind said...

HI Tim,
I'm setting up a RAC 11gR2 on OL5.8 in a VirtualBox which is hosting by windows 7 pc.

My question is do I have to configure DNS on Oracle linux or my hosting pc windows 7.

Please clarify me.

Regards,
Arvind

Tim... said...

Hi.

Configure DNS on the host PC. You can do this with Dnsmasq. That is available for Windows.

Cheers

Tim...

DO NOT ask technical questions here! They will be deleted!

These comments should relate to the contents of a specific article. Constructive criticism is good. Advertising and offensive comments are bad and will be deleted!

Add your comments here.
Name
Comment
(max 400 chars - plain text)