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Check installation prerequisites. kernel parameters, dependent packages etc.
If you have MOS access see "Requirements for Installing Oracle 11gR2 RDBMS on RHEL (and OEL) 5 on AMD64/EM64T [ID 880989.1]" or other install document in the Internet for CentOS.
One more thing is important: Java is not a prerequisite. Oracle installer and software has its own java. Unset JAVA_HOME variable before install.
Please How can I unset the java home?
As root, modify max-file-descriptor setting for grid user's project. Assuming project name for grid user is group.oinstall:
/usr/sbin/projmod -sK "process.max-file-descriptor=(priv,65536,deny)" group.oinstall
I don't see any valid reason to run CentOS in order to install Oracle database. You can download and use Oracle Linux for free from https://edelivery.oracle.com/linux. CentOS and Oracle Linux, alias OEL are both from the Red Hat source. However, Oracle Linux ships with a more modern and Oracle optimized kernel. Then setup Oracle public yum: http://public-yum.oracle.com and finally install: yum install oracle-validated to setup all prerequisites for the Oracle database installation. If you need help, try the Oracle Linux forum or subscribe to Oracle ULN for professional support. I wonder why so many people make the Oracle installation under Linux harder than it has to be.