Is Virtualisation Right for Colo? Post: 302192193

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Special Forums UNIX and Linux Applications Is Virtualisation Right for Colo? Post 302192193 by Karma on Tuesday 6th of May 2008 08:29:29 AM

05-06-2008

Registered User

Is Virtualisation Right for Colo?

Hi guys

I'm going to be moving a linux box into collocation to support the growing demands of my sites and have been trying to figure out if Xen is right for me. I'd appreciate hearing some real-world experience with the overhead involved and the optimal ways to slice up a box. Right now I feel I should either do an all-in-one setup with a hardened installation, use Xen to virtualise services I would normally run on other machines (such as DNS and SQL) and/or use Xen to rent out VPSes.

My main concern is that I don't have unlimited resources on this box, it's a dual p4-style 3.06GHz xeon with HT and 4 gigs of old ddr. So far I am going to need to accommodate the following:
- about 100,000 script-generated page views a day, with room for spikes, floods and other attacks
- dns services for about 30 domains, only three well traveled
- sql
- mail

Is Xen practical for my situation? I'm intrigued by the ability to replace and migrate virtual servers in a snap but not sure if the performance cost makes it more effective than a traditional solution. Any input is appreciated!

Karma

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LEARN ABOUT DEBIAN

adt-virt-xenlvm

adt-virt-xenlvm(1)					     Linux Programmer's Manual						adt-virt-xenlvm(1)

NAME

       adt-virt-xenlvm - autopkgtest virtualisation server using Xen and LVM

SYNOPSYS

       adt-virt-xenlvm [options] -- [adt-xenlvm options]

DESCRIPTION

       adt-virt-xenlvm provides an autopkgtest virtualisation server using a Xen virtual machine and LVM snapshots.  It adapts the raw functional-
       ity provided by the adt-xenlvm-* tools for use by autopkgtest.

       Normally adt-virt-xenlvm will be invoked by adt-run.

       adt-virt-xenlvm uses adt-xenlvm-with-testbed and adt-xenlvm-on-testbed.	The testbed must have previously been set up with  adt-xenlvm-set-
       up.

       Neither	adt-virt-xenlvm nor adt-xenlvm-with-testbed do any locking; it is the the caller's responsibility not to attempt concurrent use of
       any particular testbed.

OPTIONS

       --distro=distro
	      Specifies a different distro (ie, the use of a different testbed).

       --nominum=nominum
	      Specifies a different nominum (ie, the use of a different testbed).

       --userv
	      Specifies that the adt-xenlvm tools should not be run directly, but rather via userv.  The calling user must  be	permitted  to  use
	      userv root adt-xenlvm-testbed.  In the default configuration, this means being a member of the AdtXenUs group.

       -- --adt-xenlvm-option=adt-xenlvm-value
	      Following  the  first  occurrence of -- on the adt-virt-xenlvm commandline, any of the values in the adt-xenlvm configuration may be
	      set in the usual way.  The arguments are simply passed to adt-virt-xenlvm.

	      See /usr/share/doc/autopkgtest-xenlvm/README.gz for full details of adt-xenlvm.

       -- -Dvarname=value
	      If --userv was specified, options following the first -- on the adt-virt-xenlvm commandline are passed as option arguments to userv.
	      These  should  normally be user-defined variable settings using -D which are expected by the autopkgtest-xenlvm/userv-target script.
	      Currently only distro and nominum are expected, and these can be set using adt-virt-xenlvm's own options.

       -d | --debug
	      Enables debugging output.  Probably not hugely interesting.

INPUT, OUTPUT AND EXIT STATUS
       The behaviour of adt-virt-xenlvm is as described by the AutomatedTesting virtualisation regime specification.

SEE ALSO

       adt-run(1), adt-virt-null(1), adt-virt-chroot(1), /usr/share/doc/autopkgtest/, /usr/share/doc/autopkgtest-xenlvm/README.gz.

AUTHORS AND COPYRIGHT

       This manpage is part of autopkgtest, a tool for testing Debian binary packages.	autopkgtest is Copyright (C) 2006-2007 Canonical  Ltd  and
       others.

       See /usr/share/doc/autopkgtest/CREDITS for the list of contributors and full copying conditions.

autopkgtest							       2007							adt-virt-xenlvm(1)