Re: Fwd: [Xen-users] XEN 4.2 - DomU Restore after Dom0 reboot not working

[Ian Campbell <Ian.Campbell@citrix.com>]

Adding xen-devel.

On Sun, 2012-10-21 at 22:43 +0100, Maik Brauer wrote:
> Hi Ian,
> 
> 
> may you want to check the Line 258 in the xendomains init script.
> It quits with "Restoring Xen domains:/etc/init.d/xendomains: line 258:
> [: too many arguments"
> 
> 
> The current line is: if [ $HEADER = "LinuxGuestRecord" ]; then
> I put the $HEADER in brackets like: "$HEADER" and I modified it with
> the header what XL-Toolkit is using: "Xen saved domain"
> So basically the new line 258 looks like this: if [ "$HEADER" =
> "LinuxGuestRecord" ] || [ "$HEADER" = "Xen saved domain" ]; then

I guess "LinuxGuestRecord" is a xend-ism (its very badly chosen, there
is nothing at all specific to Linux there) while xl uses "Xen saved
domain, xl format\n \0 \r".

We could expand the check, but we would probably want to correlate the
header we look for against the toolstack which is being used (since
restoring on the other one wont work). The original check came from
15448:356bd2f3b9d8,
http://lists.xen.org/archives/html/xen-devel/2007-06/msg01011.html and
http://lists.xen.org/archives/html/xen-devel/2007-07/msg00061.html

We could also consider just removing it and try and restore any file we
find in $XENDOMAINS_SAVE i.e. rely on the toolstack's own error
handling.

Any thoughts?

> Now the Save and Restore is working perfect. Can you confirm that
> there is still a bug in the xendomains script?
> Thanks a lot.
> 
> 
> Cheers,
> Maik
> 
> Begin forwarded message:
> 
> > From: Maik Brauer <maik.brauer@mbs-systems.net>
> > 
> > Subject: Re: [Xen-users] XEN 4.2 - DomU Restore after Dom0 reboot
> > not working
> > 
> > Date: October 21, 2012 5:34:25 PM GMT+02:00
> > 
> > To: Zary Matej <matej.zary@cvtisr.sk>
> > 
> > Cc: "xen-users@lists.xen.org" <xen-users@lists.xen.org>
> > 
> > 
> > Yes that is true. It can be configured via that file. But default it
> > is already configured to work with save and restore. But in my case
> > it is not working. The domain will be save properly. But after Dom0
> > reboot it will not restore. What can be the issue here?
> > 
> > On 20.10.2012, at 23:06, Zary Matej <matej.zary@cvtisr.sk> wrote:
> > 
> > > 
> > > > 
> > > > From: xen-users-bounces@lists.xen.org
> > > > [xen-users-bounces@lists.xen.org] On Behalf Of Maik Brauer
> > > > [maik.brauer@mbs-systems.net]
> > > > Sent: 20 October 2012 17:51
> > > > To: xen-users@lists.xen.org
> > > > Subject: [Xen-users] XEN 4.2 - DomU Restore after Dom0 reboot
> > > > not working
> > > > 
> > > > Hi,
> > > > 
> > > > after a reboot of my Dom0 the DomU will not restore after the
> > > > Dom0 is available again.
> > > > The image file has been saved under /var/lib/xen/save
> > > > 
> > > > But it will not restore automatically after reboot. If you just
> > > > try to bring it up manually with
> > > > xl restore /var/lib/xen/save/mydomain
> > > > it is working and the DomU starts up.
> > > > 
> > > > What is the issue that the Domain will not start during reboot.
> > > > Thanks.
> > > > 
> > > > Cheers,
> > > > Maik
> > > 
> > > 
> > > Hi, if I recall correctly, this behavior used to be controlled via
> > > setting in config file (e.g. /etc/sysconfig/xendomains - it
> > > depends on your distro).
> > > 
> > > Matej
> > > 
> > > 
> > > _______________________________________________
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> > > Xen-users@lists.xen.org
> > > http://lists.xen.org/xen-users
> > > 
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> > > http://lists.xen.org/xen-users
> > 
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> > 
> 
> 
>