On Fri, Jul 28, 2017 at 03:53:26PM +0800, lampahome wrote: > 2017-07-28 0:31 GMT+08:00 Richard W.M. Jones <[email protected]>: > > > On Fri, Jul 28, 2017 at 12:23:04AM +0800, lampahome wrote: > > > 2017-07-27 20:18 GMT+08:00 Richard W.M. Jones <[email protected]>: > > > > > > > On Thu, Jul 27, 2017 at 06:34:13PM +0800, lampahome wrote: > > > > > I can mount qcow2 img to nbd devices through guestfish or qemu-nbd > > > > > > > > > > I'm curious about which performance is better? > > > > > > > > They do quite different things, they're not comparable. > > > > > > > > Can you specifically give the commands you are trying? We might be > > > > able to give more sensible advice. > > > > > > guestfish: > > > guestfish --rw -a demo.qcow2 -m /dev/nbd0 > > > > > > qemu-nbd: > > > qemu-nbd -c /dev/nbd0 demo.qcow2 > > > > These don't do the same thing. In fact the guestfish command doesn't > > work at all. > > > > > I just want to mount demo.qcow2 to a device > > > > Still unclear. > > > > You want to export demo.qcow2 as NBD? Use qemu-nbd. > > > > You want to mount demo.qcow2 on the local filesystem? (This doesn't > > involve NBD.) Use: > > > > mkdir /tmp/mnt > > guestmount --rw -a demo.qcow2 -i /tmp/mnt > > > > 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/ > > > I tried this: > > > mkdir /tmp/mnt > > guestmount --rw -a demo.qcow2 -i /tmp/mnt > > but it shows guestmount no operating sys found on the disk > If using guestmount -i remove this option and choose the filesystems you > want to see by manually adding -m options
The FAQ covers what the -i option is doing: http://libguestfs.org/guestfs-faq.1.html#whats-the-deal-with-guestfish--i If demo.qcow2 doesn't contain a real operating system then you will need to replace -i with one or more -m options to specify the filesystems that you want to be visible under /tmp/mnt, eg to make the first partition of the disk visible: guestmount --rw -a demo.qcow2 -m /dev/sda1 /tmp/mnt 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/ _______________________________________________ Libguestfs mailing list [email protected] https://www.redhat.com/mailman/listinfo/libguestfs
