Re: [Xen-users] sharing kernels

[list user <xktnniuymlla@xxxxxxxxxxxxxx>]

Jeff Utter wrote:
> So, I've been trying this out. But i ran into the problem where if the 
> /lib/modules was mounted in the dom0 xen wouldn't let me start a domU 
> with it as one of the disk entries. Is there any way around this, am i 
> overlooking something? for now i made a lvm snapshot of the /lib/module 
> partition so i could get my domU's back up and running.
Hi Jeff,

Here's how I did it for r/o /usr.

# disk volumes/partitions

/dev/vg0/fc4  contains /        # for domain-0
/dev/vg0/swap contains swap     # for domain-0

/dev/vg0/vm1  contains /        # for domU #1
/dev/vg0/sw1  contains swap     # for domU #1

/dev/vg0/usr  contains /usr/*   # for everybody

# from the xen domU #1 definition file  /etc/xen/vm1

disk = [
   'phy:vg0/vm1,hda1,w',
   'phy:vg0/usr,hda2,r',
   'phy:vg0/sw1,hda3,w'
]

# domain-0 /etc/fstab

/dev/vg0/fc4   /    ext3 defaults 1 1
/dev/vg0/usr   /usr ext3 ro,async,exec,suid,dev,nouser,auto 0 0
/dev/vg0/swap  swap swap defaults 0 0

# domU #1 /etc/fstab

/dev/hda1      /    ext3 defaults 1 1
/dev/hda2      /usr ext3 ro,async,exec,suid,dev,nouser,auto 0 0
/dev/hda3      swap swap defaults 0 0

There are alot of little pieces happening at different times on
different levels so it can become very confusing.  Hope this makes it a
little clearer for you.


> Thanks,
> Jeff
>
> > I use a shared /usr partition between my dom0 and all the domU's.  You 
> > may be able to do something like that.
> > Create a logical volume to contain /lib/modules/2.6.xx-xen.  Export it 
> > in your domU definitions as one of the "disk = []" entries, read only,
> > then add a mount line in each of your domU's for it.  Guaranteed to be 
> > the same on each domU.
> > BTW, none of my domU's even has a /boot partition. 
>
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