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8 Replies Latest reply: Feb 7, 2013 5:32 AM by 986120 RSS

Oracle 11gR2 RAC installation with DNS

986120 Explorer
Currently Being Moderated
Dear Guru's,

I want to configure RAC on two node cluster with DNS(For SCAN) in my testing server.

O.S: RHEL5.4(64 bit)
Oracle Version: 11gR2(11.2.0.2)

Note: Am creating nodes in VMware ESXi server.

Just I want to know whether DNS should be configure in any one of those NODES or in separate machine.

--
Bala :)
  • 1. Re: Oracle 11gR2 RAC installation with DNS
    Sebastian Solbach (DBA Community) Guru
    Currently Being Moderated
    Hi,

    depends, if you want to test failover (of SCAN) or not.

    I would configure the DNS not on the same nodes as the cluster, otherwise you have a SPOF, if you kill the node with the DNS ;)

    Regards
    Sebastian
  • 2. Re: Oracle 11gR2 RAC installation with DNS
    JohnWatson Guru
    Currently Being Moderated
    Two points:
    First, you would be better off running Linux 5.8. It comes with all the packages needed, for release 12.1 as well as 11.2.
    Second, your separate machine needs to be a DHCP server as well as a DNS server, or you won't be able to use GNS.
  • 3. Re: Oracle 11gR2 RAC installation with DNS
    BhaviSavla Explorer
    Currently Being Moderated
    Bala : ) wrote:
    Dear Guru's,

    I want to configure RAC on two node cluster with DNS(For SCAN) in my testing server.

    O.S: RHEL5.4(64 bit)
    Oracle Version: 11gR2(11.2.0.2)

    Note: Am creating nodes in VMware ESXi server.

    Just I want to know whether DNS should be configure in any one of those NODES or in separate machine.

    --
    Bala :)
    if its your test server you can make a single scan entry in /etc/hosts file.
  • 4. Re: Oracle 11gR2 RAC installation with DNS
    986120 Explorer
    Currently Being Moderated
    Thank all..

    Is that possible to make a SCAN IP entry in */etc/hosts* file for production server (Realtime).

    If can what are pros & cons.


    Thanks,

    Bala :)
  • 5. Re: Oracle 11gR2 RAC installation with DNS
    LANCERIQUE Newbie
    Currently Being Moderated
    Hi Bala,

    SCAN IP entry in /etc/hosts file and settting your nslookup is a turnaround to bypass SCAN while doing installation. It wont provide any features of SCAN. If you want to use SCAN, DNS or GNS is mandatory else you can use VIP entries (as in 11gR1) to achieve TAF.

    What is your aim ?? Goal?? You want to install it with / without DNS.

    As per my experience, SCAN is very mandatory though we have turnaround as SCAN troubles you a lot when you do patching, cloning, migration , etc. And Yes you need differnent server / VM for configuring DNS. For your tesing server, below link may be useful.

    http://www.oracle.com/technetwork/articles/hunter-rac11gr2-iscsi-088677.html#8

    Regards,
    Nikhil Mehta.
  • 6. Re: Oracle 11gR2 RAC installation with DNS
    986120 Explorer
    Currently Being Moderated
    Thanks Nikhil..

    I want to configure my Database with & without DNS. (Will try both installation in different servers)

    And want to know how it forwards the client connection if a node fails.. Can anyone update the URL for this..


    Bala :)
  • 7. Re: Oracle 11gR2 RAC installation with DNS
    Gennady Sigalaev Journeyer
    Currently Being Moderated
    Hi Bala,
    I want to configure my Database with & without DNS. (Will try both installation in different servers)
    I think, you have already received a link on very good article about Oracle RAC installation without DNS and DHCP (I mean Jeffrey Hunter's article).
    There is one more about Oracle RAC installation with DNS and DHCP (http://gjilevski.com/2011/10/05/build-two-node-oracle-rac-11gr2-11-2-0-3-with-gns-dns-dhcp-and-haip/).
    And want to know how it forwards the client connection if a node fails.. Can anyone update the URL for this..
    There are a lot of information about it:
    - http://www.oracle.com/technetwork/database/features/oci/taf-10-133239.pdf
    - http://docs.oracle.com/cd/E14072_01/java.112/e10589/apxracfan.htm
    - http://www.oracle.com/technetwork/database/app-failover-oracle-database-11g-173323.pdf

    Very good videos:
    - http://www.dsvolk.ru/oracle/racdd4d/demos/video/taf/session/session_viewlet_swf.html
    - http://www.dsvolk.ru/oracle/racdd4d/demos/video/taf/select/select_viewlet_swf.html
    - http://www.dsvolk.ru/oracle/racdd4d/demos/video/taf/callback/callback_viewlet_swf.html
    - http://www.dsvolk.ru/oracle/racdd4d/demos/video/fan/fan_viewlet_swf.html


    Hope it helps,

    Best regards,
    Gena
  • 8. Re: Oracle 11gR2 RAC installation with DNS
    986120 Explorer
    Currently Being Moderated
    Hi,

    Thanks all.

    I have installed RAC successfully with DNS as well as without DNS.

    Now my database is working fine.

    Have a look on my new thread :

    https://forums.oracle.com/forums/thread.jspa?threadID=2493754&tstart=0

    --
    Bala :)

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