tried with rhel5.1 to create a guest using the following config:
shared-disk is used as read-only and a separate disk0 is used to capture
the user defined guest changes as RW.. Note, shared-disk is pre-existing image meant
to share among the guests..
seems, all the changes made in the new guest is still writing on the read-only shared-disk,
if I change chmod 400 of shared-disk file, still it writes there..
was hoping to capture the delta changes with disk0, per guest basis to serve my
guide as required for the same ..
[mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Simon Hobson
Sent: Friday, April 17, 2009 3:14 PM
Subject: RE: [Xen-users] unionfs with xen
you trying to have a common filesystem image
by many DomUs, and use unionfs to allow
DomU to have it's own modified version ?
don't know - not something I've ever worked with.
quick look in the Xen manual
devices should typically only be shared between domains in a
fashion otherwise the Linux kernel's file systems will get
confused as the file system structure may change underneath
(having the same ext3 partition mounted rw twice is a sure fire
to cause irreparable damage)! Xend will attempt to prevent you
doing this by checking that the device is not mounted
in domain 0, and hasn't already been exported read-write
if you are prepared to do the unionfs stuff in the DomU then I'd
you could export the shared block device read-only to each
plus a separate read-write volume per guest to union with it.
at the live CD systems (like Knoppix) might give you some ideas.
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