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    Orcale RAC Part III - Clone RAC1 to RAC2 and User Equivalency
    Sunday, July 15, 2007
    Register for R12 upgrade
    This is fourth post on step by step building Oracle RAC Database on your desktop / laptop using VMWare (Virtual Machine)

    For previous three posts visit

    Try installing Orcale RAC on your laptop
    RAC Part I - Install Virtual Machine and Linux
    RAC Part II - Install Virtual Disk and Network Card

    In this post you will

    --Clone RAC1 to RAC2 and change IP address of RAc2
    --Configure User equivalency for Orale Clusterware installation

    Clone RAC1 to RAC2

    - Make sure virtual linux machine is shutdown
    -Copy folder rac1 to folder rac2 in c:\Atul\VMWARE (This is on windows laptop/machine)

    --In both RAC1 and RAC2 folder open “Red Hat Enterprise Linux 3.vmx” (This is virtual machine configuration file) using notepad or wordpad

    --Add following lines (This will avoid locking for shared files and two linux machines RAC1 and RAC2 can start together using shared files votingdisk, crs and asm)

    disk.locking = "FALSE"
    diskLib.dataCacheMaxSize = "0"
    diskLib.dataCacheMaxReadAheadSize = "0"
    diskLib.dataCacheMinReadAheadSize = "0"
    diskLib.dataCachePageSize = "4096"
    diskLib.maxUnsyncedWrites = "0"

    --Now on vmx file of RAC2 “Red Hat Enterprise Linux 3.vmx” change following lines from displayName = "RAC1" to displayName = "RAC2"

    --On VMWare Server Console, Click on File and Open or “Ctrl + O”

    --Click on Browse and select “red hat enterprise linux 3.vmx” from RAC2 directory

    --Now you should see two linux machines RAC1 and RAC2 on VMWare Console

    Start RAC1 and RAC2 and when you get below warning on RAC2, select create and click OK

    Make sure you can start both machine at same time, if you get message like unable to lock files, check you have added following lines in both machines vmx files mentioned above (regarding disk locking)

    Change Network Settings (IP) on RAC2

    Login as ROOT user in RAC2 machine and click System Setting -> Network

    Select eth0 and click on Edit

    Change Address from to

    Click on Hardware Device Tab and Click on Probe button

    --Repeat steps for second network card eth1 and change its IP from to

    Make sure you clicked probe on eth1 as well as shown above

    Activate both network cards by clicking on Activate as shown below

    If you get error message that eth0 has different MAC address expected as shown below; make sure you have clicked on probe on “Bind to Mac Address” on “Hardware Device” mentioned above.

    Make sure both network cards are active now, as shown below

    Add following entry in /etc/hosts file of both RAC1 and RAC2

    #### loalhost.localdomain localhost rac2 rac2-vip rac2-priv rac1 rac1-vip rac1-priv


    Now trying to ping RAC2 machine from RAC1 and RAC1 machine from RAC2

    Change Host Name of newly cloned RAC2


    Follow below step on how to change hostname on RAC2 (newly cloned) Linux machine
    Open file /etc/sysconfig/network and edit line like : HOSTNAME=XXXXX i.e. from

    Configure User Equivalency


    User equivalency for user oracle is required so that user oracle from RAC1 can communicate to user oracle on RAC2 machine without prompting for password for clusterware to work properly.

    --Login as user oracle in machine RAC1
    --Make sure sshd daemon is running (pgrep sshd), If not start it from root user like “service start sshd
    --Create RSA and DSA key on each node
    -From oracle user go to user home directory by “cd $HOME” or type cd and press enter
    -mkdir .ssh (note that there is dot before ssh which means this is hidden directory)
    -chmod 700 .ssh
    -ssh-keygen –t rsa
    -ssh-keygen –t dsa
    press enter when prompted for file to save the key and passphrase (check screenshot for more information)

    Repeat this on both the nodes i.e. RAC1 and RAC2

    Add keys to authorized key file (authorized_keys)
    -cd .ssh
    -touch authorized_keys
    -ls (You should see authorized_keys, id_dsa,, id_rsa, Here pub files are dsa and rsa public key file and id_dsa and id_rsa are private key files)
    ssh rac1 cat /home/oracle/.ssh/ >> authorized_keys
    ssh rac1 cat /home/oracle/.ssh/ >> authorized_keys
    ssh rac2 cat /home/oracle/.ssh/ >> authorized_keys
    ssh rac2 cat /home/oracle/.ssh/ >> authorized_keys
    Send authorized_keys from RAC1 to RAC2
    scp authorized_keys rac2:/home/oracle/.ssh

    From RAC1 machine as user oracle
    exec /usr/bin/ssh-agent $SHELL

    Test User Equivalency (User oracle can login to other machine without password prompt)
    ssh rac1 date
    ssh rac2 date

    Test this from both nodes RAC1 and RAC2 (You should not be prompted for oracle user password)

    For more information on User Equivalency visit chapter 2 (Page 51 to 53) of clusterware and rac installation guide

    Coming Next :
    Installing clusterware on RAC1 and RAC2
    Installing RAC database on RAC1 and RAC2 linux machines using ASM

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    posted by Atul Kumar @ 9:42 AM  
    • At 3:32 PM, Blogger Steve said…

      Great series. I am looking forward to the completion, as I have configured my 2 nodes and am ready for the next step. I am going to take a stab at installing clusterware myself (it has been a while now).

      Thanks for the great site.

    • At 4:02 PM, Blogger Atul Kumar said…

      Hi Steve, I'll post remaining RAC install parts as soon as I find some time.

    • At 4:01 PM, Anonymous Anonymous said…

      I followed all the four series, brilliant compilation.


    • At 4:04 PM, Blogger Atul Kumar said…

      Thanks Sam

    • At 8:33 AM, Blogger Arman said…

      Hi ... first of thanks for the tremendous ifnormation and so easy setup ... my doubt is that i have Oracle 9.0.2 i .... Can i use it as RAC ... will it be the same.

    • At 1:52 PM, Blogger josef said…

      Hi Atul,

      Certainly do appreciate your efforts.

      Atul, since I am following your instructions on a laptop that is connected to WAN with Verizon Wireless Broadband card, the ethernet cards only work if i set them to NAT. how will this affect Step III? I have just finished cloning RAC2.

      Best regards,
      joe taylor

    • At 7:11 PM, Anonymous sico said…

      can we use enterprise linux instead of redhat for RAC

    • At 2:47 PM, Anonymous Anonymous said…

      At this stage, I ran into a problems which says "the network bridge on device vmnet0 is not running".
      Please how do I go about this?

    • At 8:07 AM, Blogger Geets said…

      Hi Atul


      I have started installation of RAC on my laptop.
      Post installation of User equivalence, its still asking me for passwords of cluster.
      Could you please let me know the possible errors occur at the time of user-equivalence.
      Thanks in Advance.

    • At 2:53 AM, Blogger yusuf said…

      Hi Atul,

      I am getting following error when installing clusterware

      caught cluster exception r PRKC 1044- failed to check remote command execution setup for node using shells /usr/bin/ssh and /usr/bin/rsh Connection Refused

      Installer window show following error:

      you must enter unique values for the public node name,the private node name and the virtual hostname for all node in the cluster.the that you entered is being used by more than once for the same node.

      How can I fix this problem?


    • At 9:35 AM, Blogger syed said…

      Hi Atul


      Hope you are doing fine with your health. First of all thanks for such a tremendous effort for making us known about installation of RAC on laptop/dektop.

      I have started installation of RAC on my desktop and i have done with cloning part but i am facing a problem in user equivalence. While sending authorized_keys from RAC1 to RAC2 it is asking me to type the password, which i did and there i am getting an error as "Permission denied. Please try again later".

      One more thing i want to clarify about that password, are we using a passphrase password which we have giving while configuring the keys??

      Could you please let me know the possible errors occur at the time of user-equivalence and which password we have to use while connecting to rac2 from rac1 for sending authorized_keys.

      I will be waiting for your reply.

      Thanks in Advance.

    • At 9:35 PM, Anonymous Anonymous said…

      Hi Atul,

      I have been trying to install RAC since a long time and finally I got your series on the same. I have configured the tow virtual machines as you have given, but when i try to ping each other I am not able to. Please help. Here's the error i get:-
      ping rac2
      PING ( 56(84) bytes of data
      fROM ( icmp_seq=0 Destination host unreachable

    • At 4:34 PM, Blogger lofty said…

      I was having issues with SSH user equivalency.

      Issue was whenever i try to ssh onto rac1 or rac2 machine, it always asked for password; - yes I followed the steps mentioned here/ in the docs.

      The Solution is to when you have created 'authorized_keys' file ; once again chmod it to 700 onto both/N nodes.

      Though we've chmod 700 .ssh earlier in the steps but for whatever reason authorized_keys file permission were != chmod 700.

      why it is happening? I'll much appreciate if someone can let me know - Thnx

      my environment is Enterprise unbreakable linux + vmware + two nodes with unbreakable enterprise linux.

    • At 6:33 AM, Blogger suresh said…

      Hi Atul,

      I am doing RAC on my laptop using above mentioned steps.
      In Part III of RAC Install using VM wear.
      I created authorized_keys but i am not able to ssh to RAC2, but i can ping both the systems but i am not able to do scp or anything, Please guide me how to resolve this issue?

      Best Regards,
      Suresh G

    • At 11:35 AM, Blogger Suresh said…

      Hi Athul,

      I am installing RAC on my laptop, I a m following the exact steps which you have provided, but when i issue this command "$ssh rac1-vip date " it is asking password, but rest of the things it is not asking the password. please guide me to resolve this issue..

      Best Regards,
      Suresh Gelda

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