[Libguestfs] Can I use virt-filesystem on a running VM?

[Sergio Belkin]

El lun, 11 ene 2021 a las 12:30, Richard W.M. Jones (<rjones at redhat.com>)
escribió:

> On Mon, Jan 11, 2021 at 12:04:22PM -0300, Sergio Belkin wrote:
> >
> >
> > El lun, 11 ene 2021 a las 6:41, Richard W.M. Jones (<rjones at redhat.com>)
> > escribió:
> >
> >     On Sat, Jan 09, 2021 at 05:23:13PM -0300, Sergio Belkin wrote:
> >     > So do you think that is a SELinux issue (I haven't found anything
> >     > related to this with ausearch or audit logs)? So, can
> >     > virt-filesystems crash the guest? (I had to reboot and repair the
> >     > xfs)
> >
> >     It's not that virt-filesystems is affecting the guest, it's that
> >     libvirtd relabels the disks and as a result original qemu loses
> access
> >     to its disks.
> >
> >     Try with LIBGUESTFS_BACKEND=direct which doesn't use libvirt or
> >     SELinux labelling.
> >
> >     Rich.
> >
> >     --
> >     Richard Jones, Virtualization Group, Red Hat
> http://people.redhat.com/
> >     ~rjones
> >     Read my programming and virtualization blog:
> http://rwmj.wordpress.com
> >     libguestfs lets you edit virtual machines.  Supports shell scripting,
> >     bindings from many languages.  http://libguestfs.org
> >
> >
> >
> > Hi Richard, thanks for your kind explanation and help. It worked like a
> charm.
> >
> > In case it becomes useful to someone, I get:
> >
> > Name                    Type       VFS  Label MBR Size Parent
>   UUID
> > /dev/sda1               filesystem xfs  -     -   500M -
> >  8746b377-7e21-4cb5-b269-c034720d65c1
> > /dev/centos_lx0001/root filesystem xfs  -     -   48G  -
> >  3a3d6041-5f1c-479f-92cf-42a569d57bab
> > /dev/centos_lx0001/swap filesystem swap -     -   2,0G -
> >  76addd8c-7aa1-4779-8a86-70ab6baca2b2
> > /dev/centos_lx0001/root lv         -    -     -   48G  /dev/centos_lx0001
> > 2d4fOO-fXZm-HDHi-CiTY-umH3-Icu9-peXjGZ
> > /dev/centos_lx0001/swap lv         -    -     -   2,0G /dev/centos_lx0001
> > mbKcjk-YXVg-MjhS-L0IA-cNgg-KF0o-4uxvc5
> > /dev/centos_lx0001      vg         -    -     -   50G  /dev/sda2
> >  17HB8hKfxKZHis9Tcrq2XoFLldN0fAft
> > /dev/sda2               pv         -    -     -   50G  -
> >  NZT8FHFBUed0PZyKsrXLWAnemghOO0J7
> > /dev/sda1               partition  -    -     83  500M /dev/sda
>   -
> > /dev/sda2               partition  -    -     8e  50G  /dev/sda
>   -
> > /dev/sda                device     -    -     -   50G  -
>  -
> >
> > Jut only a question about this output, just out of curiosity why does it
> print
> > /dev/sda* instead /dev/vda* ?
>
> We don't know what drivers are installed in the guest, or (in
> virt-filesystems) even what the guest is.  Maybe it's Linux with
> virtio.  Maybe it's Windows.  So we use a canonical naming scheme for
> devices and partitions:
>
> https://libguestfs.org/guestfs.3.html#block-device-naming
>
> Rich.
>
> --
> Richard Jones, Virtualization Group, Red Hat
> http://people.redhat.com/~rjones
> Read my programming and virtualization blog: http://rwmj.wordpress.com
> virt-top is 'top' for virtual machines.  Tiny program with many
> powerful monitoring features, net stats, disk stats, logging, etc.
> http://people.redhat.com/~rjones/virt-top
>
>
Thanks again!

-- 
--
Sergio Belkin
LPIC-2 Certified - http://www.lpi.org
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