Chris Tyler wrote:
On Wed, 2007-07-18 at 11:28 -0400, Asrai khn wrote:
Hi I am wondering is there an easy way to configure domU (vm) quickly,
atm we are using eg LV (Logical Volumes) to storge root, var and swap
for VM and then using disk = [ 'phy:vg/myvmdisk1,sda1,w', ... ,... ]
to launch it.
We takes the tar gunzip of file system of root, var of currently
running vm and when need arrives we just have to created LVs and
untar the achieves and launch the new vm with very little changes.
Only one problem in this approach is that we get little outdated vm
which need to update using 'yum'. So is there a way to start new vm
fast and using currently updated running vm file system?
Thanks. Askar.
You could use LVM snapshots. They're copy-on-write, so they can be
created quickly. Of course, if you start a new VM on a snapshot of a
running VM, then the filesystem will not be clean (it will look as
though it was from a system that was turned off without being shutdown).
--
Chris Tyler
http://dailypackage.fedorabook.com/
I've found an easy way is just to use dd.
dd if=/dev/VolGroup00/virtual-1 of=/dev/VolGroup00/virtual-2 bs=1M
I've tried LVM snapshots, but found that sometimes they seemed to run
slowly, and if you made a copy of a copy, they ran even more slowly.
Perhaps they work fine under some conditions, but they didn't for me.
dd, however, has never failed me. Just remember to start it up in
console mode first, and change the ip address. Also, (you probably know
this, but), don't forget to change the mac address and uuid when you
copy the xen config file (and rename the machine, too.)
Bill Jenkins
CAIT, Western Illinois University
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