Re: [Xen-users] How can you boot dom0 with a rootfilesystem that lives in memory?

[Adam Goryachev <mailinglists@xxxxxxxxxxxxxxxxxxxxxx>]

On 25/10/18 1:53 am, Matthieu Cerda wrote:
> Le 24/10/2018 à 05:09, Kleve, Jesse R a écrit :
> > I’m trying to find a way to load a rootfs into memory and have dom0 use this as 
> > the root filesystem instead of extracting the rootfs on to an SD card partition and 
> > mounting that. Is this possible? I have been unable to find any documentation on this. 
> > Is there a property in the dom0 chosen section of the device tree to specify the 
> > location of the rootfs?
> >
> > Thanks,
> > Jesse
> Hi Jesse,
>
> It is possible, we do it actually here.
>
> What is your target dom0 OS ? ( On Debian / Ubuntu, you might either use
> homemade solutions, or to make things easier,
> http://cmrg.fifthhorseman.net/wiki/debirf )

I used to do this years ago (not any more) for my xen servers. Initially 
I was using NFS root, but I found any NFS issue would crash all the 
dom0, and then it made it really hard to fix/debug what was going on. In 
the end, I used a custom init script/plugin to initramfs, which simply 
created a ram disk (4G) and then copied the files from the NFS server 
into RAM. In your case, the source of the filesystem can be whatever you 
want. Seeing the above debirf, it seems I'm not the only one to have 
wanted to do this.
PS, in my case, the xen servers were totally diskless.

Regards,
Adam

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