Re: [Xen-users] How to boot a VM using read-only disks

[Ted Kaczmarek <tedkaz@xxxxxxxxxxxxx>]

On Mon, 2005-10-03 at 15:16 -0700, Eric Tessler wrote:
> I want to boot a VM that contains 2 disks: the main boot disk and a
> secondary disk.  However, I want the secondary disk to be read-only.
> In my XEN VM configuration file, if I specify the secondary disk as
> read-only (using the "r" option) the VM fails to boot.  It looks like
> during boot the OS is trying to write to the secondary disk.  If I
> configure the secondary disk to be read-write in the XEN VM config
> file, the VM boots without any problems (the secondary disk is indeed
> read-only, however I also want to be able to boot it in that way, I
> don't want the OS writing to it).  Note that in my VM boot disk image
> (file backed), the fstab is updated correctly -with both disks
> specified and the secondary disk as read-only.
>  
> Here is how my disks are specified in the XEN VM config file for
> clarifiction:
>  
> disk=[ 'phy:/dev/loop0,/dev/hda1,w',
>           'phy:/dev/loop1,/dev/hda2,r' ]
>  
> (both file backed disks are bound to loop devices)
>  
> Has anyone tried this before and got it working???
>  
> Eric
>  
Why not just mount it read only from an init script?

Regards,
Ted


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