How to shrink or compact VirtualBox .vdi images

This works for Windows 

 

You have to do the following steps:

  1. run defrag in the guest (Windows)
  2. nullify free space:

    With Linux guest run this:

    sudo dd if=/dev/zero of=/bigemptyfile bs=4096k sudo rm -rf /bigemptyfile 

    With Windows guest, download SysinternalsSuite and run this:

    sdelete –z 
  3. shutdown the guest VM

  4. now run VBoxManage’s compact command

    VBoxManage.exe modifyhd thedisk.vdi --compact 

This reduces the size.

 

This works for Mac OS X

Open Terminal

Enter the following command:

 

VBoxManage modifyhd -compact “/Users/user1/VirtualBox VMs/Windows 7/Windows 7.vdi”

 

References

http://superuser.com/questions/529149/how-to-compact-virtualboxs-vdi-file-size

Screenshot of website using php on linux using PhantomJS WebKit

Main project page

http://phantomjs.org/download.html

 

 

Setup your environment

 

Setup phantomjs on Amazon EC2 instance

 

Setup your script

 

Capture webpage screenshot using PHP and Phantomjs

 

Additional reading on the PhantomJS

 

http://pielmeier.blogspot.ca/2011/02/headless-html-page-rendering-with.html

 

http://stackoverflow.com/questions/3342966/taking-website-screenshot-server-side-on-a-linux-rented-server-free