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