Read-only view of a ZFS filesystem inside a bhyve guest?

[Mark Raynsford]

On 2018-04-28T09:08:42 +0300
Daniel Braniss <danny at cs.huji.ac.il> wrote:

> since the clients and the server are sharing the zfs volume,
> I’m doing the following:
> on the server I did:
> 	zfs create -sV 4G h/root.ro <http://root.ro/>
>   	newfs /dev/zvol/h/root.ro <http://root.ro/>
> 	mount /dev/zol/h/root.ro <http://root.ro/> /mnt
> 	copy a working root image to it.
>         umount /mnt
> 	the clients then mount it as ro,
> 	the vm conflg file has:
> 		disk0_type=virtio-blk”
> 		disk0_name=“/dev/zvol/h/root.ro <http://root.ro/>”
> 		disk0_dev=“custom”
> 
> one solution to the fact that the root is read-only is to use unionfs (probably nullfs will do too)
> 
> the only problem I have is updating the image.

Wow, didn't know this was possible. Is this safe? Two essentially
independent operating system instances being able to write to the same
zvol?

-- 
Mark Raynsford | http://www.io7m.com

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