Christopher Juckins

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If the install process hangs at:
<code>
NetLabel: initializing
NetLabel: domain hash size = 128
NetLabel: protocols = UNLABELED CIPSOv4
NetLabel: unlabeled traffic allowed by default
NET: Registered protocol family 2
</code>
Then you must enable IO APIC for the guest in the settings dialog or append kernel boot parameter nolapic (for installation: linux nolapic | for installed CentOS guest: in grub append to the end of the line begining with kernel nolapic).  

See [[https://forums.virtualbox.org/viewtopic.php?f=9&t=23900]]

Tips for installing using an .iso file:
https://forums.virtualbox.org/viewtopic.php?f=7&t=24426

The minimal install file did not seem to find a network driver.  Needed to use the full .iso images (this was for a CentOS 6 installation).  You can load a virtual CD/DVD iso file by selecting the appropriate pull-down menu option in the Virtual machine.  You may need to do this if the system "ejects" the virtual disc.  You can also set up virtual CD/DVD drives ahead of time using the virtual machine setup "Settings" menu.  Just load multiple .iso images using this process.

Getting the desktop to display full width on the monitor:

First use system-config-display to set the Montor (Virtual Box output) to 1920x1200.  Then reboot, then re-install VBOX Guest Additions and reboot once more.  Once the machine comes back and you have logged in, you may need to resize/maximize the current window to get the desktop to stretch properly.