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Re: [Qemu-devel] Emulation: Building solid files

From: Markus Hitter
Subject: Re: [Qemu-devel] Emulation: Building solid files
Date: Wed, 27 Jun 2007 08:56:11 +0200

Am 27.06.2007 um 00:22 schrieb NetAudi:

Building virtual machines taking only one big binary file (merging Qemu engine and HD image file). It could be good for future portable aplications. I thought this because I'm triying to do the simplest-ultra-secure Internet navigatior. The idea is to generate a VM (with the lightest/ functional O.S. posibility and increase speed at top) to content a Firefox installation (with the most used complements into it). The main is to load all this VM into the RAM and when it will turn off, it never has to save the session
changes, it allways must start at the beginning point.

How does stuffing all virtual machine parts into one file help you to load a virtual machine entirely into RAM? Surely, one could manage to load multiple files into RAM.

Additionally, I don't see how it helps security if you move the hard disk for the virtual machine into RAM. It should be fully sufficient to let the inital hard disk sitting in the file system and to record changes to the virtual hard disk, only. qemu supports such recordings (shadowed file systems) already and if it makes you happy, it shouldn't be too hard to keep the record of changes in RAM. This saves you a lot of startup time as well als hundreds of megabytes of RAM.

For an approach without any changes to qemu, you could have a look into how (Linux) Live CDs work. Most of them work without a writeable hard disk, managing all the RAM-disk stuff themselves.


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Dipl. Ing. Markus Hitter

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