Taking it further: XEN and OpenVZ
Your customers will face the same problem that you faced initially. They will end up
running their services unseparated on the same VM. Not anymore, today I will explain a technique to overcome this limitation. We will further divide the VM into multiple Virtual Environments (VEs) using OpenVZ.
OpenVZ is a virtualization technology / software that, unlike XEN, allows for resource sharing. You have the ability to allocate the same amount of cpu/memory to several VEs and they will use it as needed. This kind of virtualization is perfect for isolating services inside of a XEN VM. This way your customers can benefit from service isolation too.
I will assume that you have properly installed CentOS with XEN and have successfully created a CentOS 5.2 x86_64 Xen VM. We will be doing the install from the console.
Installing OpenVZ
To install OpenVZ on a XEN VM you will need to log into the VM.
Full article at http://www.linuxsecurityforum.org/f5/taking-it-further-xen-and-openvz-on-centos-t220.html
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