I want to use slackware as a web server but i want to have it on a virtual machine, i know how to install it and everything but i need to be able to copy my virtual machine on my usb drive which is limited to 3.7GB (embarrassing i know...), what packages could i leave behind to reduce the size of the installtion and still be able to run it as a web server?

Install anything that does not belong to the GUI, so no KDE, KDEI, XAP, X. It should also be safe to leave out the packages that have no use on a server, for example command line music-players. Just make sure that you have all needed dependencies.

I guess the whole X system would considerably reduce the required space (and you don't really need X for running a web server)

If you are using VirtualBox, you can both compact the size and clone the USB virtual machine.

To compact:

1. Open the virtual machine
2. dd if=/dev/zero of=/bigfile (wipes free space with zeroes)
3. rm -f /bigfile
4. Close the virtual machine
5. vboxmanage modifyvdi nameof.vdi compact

Compacting will reduce the size of the virtual machine. I compact my Current virtual machine often. I save considerable space each time.

FWIW: To compact a Windows virtual machine, download a utility called sdelete. Use that command to zero wipe all free space. Then compact the same way using the vboxmanage command.

To clone:

vboxmanage clonehd usbimage hdimage

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This set of packages is for Linux-Vserver: http://notes.sagredo.eu/sites/notes....erver/PKG_LIST. It produces a guest of about 450MB and fits all the prerequisites for httpd, mysql, postgres, qmail and related.
Since Linux-Vserver is an OS level virtualization, if you have qemu or virtualbox etc. just add all hardware and kernel related packages (more info here: http://notes.sagredo.eu/node/7).

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I run my site on a minimal-slackware VM using KVM.
It totals 359MB after installed, and that includes 80MB worth of www and mysql content.

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Slax-dude, I saw your article about minimal slack's tagfiles. Do you have plans to update it to v. 13-37?

As soon as I get LXC working with libvirt I'll look into it
There should not be a very different package list from 13.1