Re: [Xen-users] Debian Etch Xen Cluster (DRBD, GNBD, OCFS2, iSCSI, Heartbeat?)

[Dominik Klein <dk@xxxxxxxxxxxxxxxx>]

Christian Horn schrieb:
> On Thu, Sep 13, 2007 at 03:43:24PM +0200, Dominik Klein wrote:
> > > Just remember, if something goes wrong in such a way that the domain is
> > > active on both nodes at the same time with read/write access to the
> > > filesystem, you *will* *destroy* the filesystem and will need to restore
> > >from backup. No amount of fscking will help you.
> > > (I speak from bitter experience :)
> > Full Ack (without the bitter experience yet though).
> >
> > That's why you want to have a functioning STONITH Device and redundant 
> > cluster communication ways.
> That will only help on clusterside.
Correct.
Keep your hands off Xen if you have a cluster software manage it. Use 
cluster commands if you need to do anything manually.
> Has anyone good ideas on how to prevent domUs that are stored on evms or
> clvm from beeing started on multiple dom0s?
You could use a wrapper script for xm.

I don't use anything like that, but this should give you an idea of what 
I am thinking of.
.bashrc:
alias xm=myxm.sh

myxm.sh
#!/bin/bash

if echo $* | grep -q -w create
then
# for this, you need passwordless ssh access to $othermachine
if ssh $othermachine "xm list $machine"
then
        echo "domU $machine already running on $othermachine. Exit"
        exit 5
else
        /usr/sbin/xm $*
fi
else
/usr/sbin/xm $*
fi

Regards
Dominik

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