Re: [Libguestfs] Can I use virt-filesystem on a running VM?
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(a)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