[Libguestfs] Help: Is it possible to use libguestfs in Xen guest OS

[Baochuan Wu]

Thanks Rich.

Best Regards,
Allen

2016-04-08 5:54 GMT+08:00 Richard W.M. Jones <rjones at redhat.com>:

> On Thu, Apr 07, 2016 at 10:12:07PM +0800, Baochuan Wu wrote:
> > Hi All,
> >
> > I installed CentOS 7 as Xen Guest OS(DomU OS), I wonder if it is possible
> > to use libguestfs in this CentOS 7 VM? libguestfs-test-tools reports
> error:
> [...]
> > Original error from libvirt: internal error: process exited while
> > connecting to monitor: Cannot set up guest memory 'pc.ram': Cannot
> allocate
> > memory
> [...]
> > Cannot set up guest memory 'pc.ram': Cannot allocate memory
> > libguestfs: error: appliance closed the connection unexpectedly, see
> > earlier error messages
>
> It looks as if you VM has very limited RAM, not enough to start up the
> qemu instance.  If you give your VM more memory, then libguestfs
> should work fine.  We run libguestfs nested all the time.
>
> > After running "*export LIBGUESTFS_BACKEND=direct*", it seems libguestfs
> > will launch another VM inside my VM. Is this necessary?
>
> That's how libguestfs works:
>
>   http://libguestfs.org/guestfs-internals.1.html
>
> Rich.
>
> --
> Richard Jones, Virtualization Group, Red Hat
> http://people.redhat.com/~rjones
> Read my programming and virtualization blog: http://rwmj.wordpress.com
> virt-df lists disk usage of guests without needing to install any
> software inside the virtual machine.  Supports Linux and Windows.
> http://people.redhat.com/~rjones/virt-df/
>
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