CentOS 7 32 bit VirtualBox client

Officially, CentOS 7 only has x86_64.  The first version 7.0 was released in 2014.

Not until 10/13/2015, AltArch SIG released a CentOS 7 32 bit for IOT x86 boards.
Release note: https://wiki.centos.org/SpecialInterestGroup/AltArch/i386
Release images: http://mirror.centos.org/altarch/7/isos/i386/

Not like the x86_64 version, the 32 bit version is not typically available on CentOS mirror sites.

At this moment, AltArch CentOS 7 32 bit version meets our need of creating USB token now with a catch.
- The two required RPM packages are from CentOS 6.7.  Luckily, they are working.

So far, I believe that it would be in the best interests of normal institution to consider taking CentOS 7 x86_64 instead of 32bit (i386/i686) version.  With x86_64, there is definitely less worry for future.

Note for getting the task done.

2 VirtualBox
2.1 Required VirtualBox components
Both VirtualBox installer and extension pack are required.  They can be found on the URL
http://www.oracle.com/technetwork/server-storage/virtualbox/downloads/index.html

2.2 Virtual Machine Creation
2.2.1 VirtualBox options
System->Motherboard->Base Memory must be >= 512MB
System->Processor->Extended Features check Enable PAE/NX
Network->Adapter 1 -> Advanced ->Adapter Type Intel PRO/1000 MT Desktop (8254OEM)
USB -> Enable USB Controller -> USB 3.0 (xHCI) Controller

Note that xHCI driver should be from vendors, Intel etc.

3 Install CentOS
3.1 Required CentOS 7 components
CentOS 7 ISO image
http://mirror.centos.org/altarch/7/isos/i386/CentOS-7-i386-Minimal-1503.iso
vim filesystem RPM package
ftp://fr2.rpmfind.net/linux/centos/6.7/os/i386/Packages/vim-filesystem-7.4.629-5.el6.i686.rpm
vim common RPM package
ftp://fr2.rpmfind.net/linux/centos/6.7/os/i386/Packages/vim-common-7.4.629-5.el6.i686.rpm