Create groups and users

[root@vmdb12c ~]# groupadd oinstall
[root@vmdb12c ~]# groupadd dba
[root@vmdb12c ~]# groupadd oper
[root@vmdb12c ~]# groupadd backupdba
[root@vmdb12c ~]# groupadd dgdba
[root@vmdb12c ~]# groupadd kmdba
[root@vmdb12c ~]# useradd -g oinstall -G dba,oper,backupdba,dgdba,kmdba oracle
[root@vmdb12c ~]# passwd oracle
Changing password for user oracle.
New password: 
BAD PASSWORD: it is based on a dictionary word
BAD PASSWORD: is too simple
Retype new password: 
passwd: all authentication tokens updated successfully.
[root@vmdb12c ~]# id oracle
uid=501(oracle) gid=501(oinstall) groups=501(oinstall),502(dba),503(oper),504(backupdba),505(dgdba),506(kmdba)

[root@vmdb12c yum.repos.d]# wget http://public-yum.oracle.com/public-yum-ol6.repo  
--2013-09-01 14:05:42--  http://public-yum.oracle.com/public-yum-ol6.repo
Resolving public-yum.oracle.com... 137.254.56.43
Connecting to public-yum.oracle.com|137.254.56.43|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 2778 (2.7K) [text/plain]
Saving to: “public-yum-ol6.repo.3”

100%[===========================================================================================================================================================================================>] 2,778       --.-K/s   in 0s      

2013-09-01 14:05:42 (280 MB/s) - “public-yum-ol6.repo.3” saved [2778/2778]

[root@vmdb12c ~]# yum install oracle-rdbms-server-12cR1-preinstall
Loaded plugins: refresh-packagekit, security
Setting up Install Process
Resolving Dependencies
--> Running transaction check
---> Package oracle-rdbms-server-12cR1-preinstall.x86_64 0:1.0-8.el6 will be installed
--> Processing Dependency: compat-libcap1 for package: oracle-rdbms-server-12cR1-preinstall-1.0-8.el6.x86_64
--> Processing Dependency: ksh for package: oracle-rdbms-server-12cR1-preinstall-1.0-8.el6.x86_64
--> Processing Dependency: libaio-devel for package: oracle-rdbms-server-12cR1-preinstall-1.0-8.el6.x86_64
--> Processing Dependency: compat-libstdc++-33 for package: oracle-rdbms-server-12cR1-preinstall-1.0-8.el6.x86_64
--> Running transaction check
---> Package compat-libcap1.x86_64 0:1.10-1 will be installed
---> Package compat-libstdc++-33.x86_64 0:3.2.3-69.el6 will be installed
---> Package ksh.x86_64 0:20100621-19.el6_4.4 will be installed
---> Package libaio-devel.x86_64 0:0.3.107-10.el6 will be installed
--> Finished Dependency Resolution

Dependencies Resolved

=====================================================================================================================================================================================================================================
 Package                                                                  Arch                                       Version                                                    Repository                                      Size
=====================================================================================================================================================================================================================================
Installing:
 oracle-rdbms-server-12cR1-preinstall                                     x86_64                                     1.0-8.el6                                                  ol6_latest                                      15 k
Installing for dependencies:
 compat-libcap1