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xen-users
RE: [Xen-users] unionfs with xen
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RE: [Xen-users] unionfs with xen |
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From: |
Simon Hobson <linux@xxxxxxxxxxxxxxxx> |
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Date: |
Fri, 17 Apr 2009 10:43:46 +0100 |
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Pallab Chakrabarty wrote:
Are you trying to have a common filesystem image
shared by many DomUs, and use unionfs to allow
each DomU to have it's own modified version ?
YES
kindly guide me..
I don't know - not something I've ever worked with.
A quick look in the Xen manual
(http://tx.downloads.xensource.com/downloads/docs/user/) comes up
with this :
Block devices should typically only be shared between domains in a
read-only fashion otherwise the Linux kernel's file systems will get
very confused as the file system structure may change underneath
them (having the same ext3 partition mounted rw twice is a sure fire
way to cause irreparable damage)! Xend will attempt to prevent you
from doing this by checking that the device is not mounted
read-write in domain 0, and hasn't already been exported read-write
to another domain.
Now, if you are prepared to do the unionfs stuff in the DomU then I'd
guess you could export the shared block device read-only to each
guest, plus a separate read-write volume per guest to union with it.
Looking at the live CD systems (like Knoppix) might give you some ideas.
--
Simon Hobson
Visit http://www.magpiesnestpublishing.co.uk/ for books by acclaimed
author Gladys Hobson. Novels - poetry - short stories - ideal as
Christmas stocking fillers. Some available as e-books.
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