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Start the runInstaller as oracle user from any one node after setting appropriate oracle base (/u01/app/oracle).

[oracle@node1-pub ~]$ export ORACLE_BASE=/u01/app/oracle
[oracle@node1-pub ~]$ 11g_database/database/runInstaller

Click Next



Select "Custom" and Click Next.



Click Next



Select all the nodes and Click Next



At this step, you should not receive any error. If you have configured the Pre-Installation
steps correctly, then you will not get any errors. I get one warning here as you can see which
is complaining about the low memory than required. I had only 512 MB ram and the required memory
is 1GB but I would not worry about this warning and will check the status box.

Click Next




Click Next



Leave the Default values (dba, dba) and Click Next



Select "Install database Software Only" and Click Next



Click Install





Execute the mentioned script on all the nodes.







At this time, create an env file  on all the nodes with the appropriate value of ORACLE_HOME and PATH.

oracle@node1-pub ~]$ cat .bash_profile
# .bash_profile
 
# Get the aliases and functions
if [ -f ~/.bashrc ]; then
        . ~/.bashrc
fi
 
# User specific environment and startup programs
 
PATH=$PATH:$HOME/bin
 
unset USERNAME
 
export CRS_HOME=/u01/app/crs
export ASM_BASE=/u01/app/asm
export ASM_HOME=$ASM_BASE/product/11gr1
export ORACLE_BASE=/u01/app/oracle
export ORACLE_HOME=$ORACLE_BASE/product/11gr1
PATH=$PATH:$CRS_HOME/bin:$ORACLE_HOME/bin
export PATH
 
# The below piece of code avoid the RAC installation error due to stty
 
if [ -t 0 ]; then
   stty intr ^C
fi
 
umask 022

At this point, we are ready to create a RAC database next.