On Sat, May 31, 2014 at 12:38:15AM +0800, sjy wrote: > > Hello, I've tried to use guestfish to lively mount virtual machine image. > Here are some problems I met.
> 1. The name parameter in below command must be > org.libguestfs.channel.0. or else the guest would produce error > 'failed to connect to virtio-serial' and > '/dev/virtio-ports/org.libguestfs.channel.0: No such file or > directory' even though there did exists a file 'com.test.my' in > 'dev/virtio-ports' directory. > sudo kvm -drive file=ubuntu-1204-vm.img -m 512 -vga std -k en-us > -vnc :1 -net nic -net > tap,ifname=tap1,script=./qemu-ifup,downscript=no -daemonize -device > virtio-serial-pci,id=virtio-serial0,bus=pci.0,addr=0x6 -chardev > socket,id=charchannel0,path=/var/lib/libvirt/qemu/test.agent,server,nowait > -device > virtserialport,bus=virtio-serial0.0,nr=1,chardev=charchannel0,id=channel0,name=com.test.my The daemon (running inside the virtual machine) expects that the virtio-serial port has the exact name "org.libguestfs.channel.0". If you give the virtio-serial port any other name then it just won't work. > 2. I leaved the first problem by altering the device name to default > org.libguestfs.channel.0, now I can visit the live guest by > guestfish. However, any write or edit operation like vi or write > don't work even I set --rw option with guestfish. It seems like > guestfish just write the results to a tmp file in /tmp/guestfish**/ > directory rather than the guest image file. I don't know if it needs > a writeback operation to make the changes happen. Besides, read > operation like cat can only read files produced before the mount > operation, any real time modification by the guest can't be found > with guestfish --live. That's pretty odd. What exact guestfish command are you running? Note that guestfish --live will only work correctly when the guest is managed by libvirt. So if you're starting the guest using qemu commands directly, I don't see how it can work. You can see the API calls that guestfish makes by adding the '-x' option. Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones Read my programming and virtualization blog: http://rwmj.wordpress.com virt-builder quickly builds VMs from scratch http://libguestfs.org/virt-builder.1.html _______________________________________________ Libguestfs mailing list [email protected] https://www.redhat.com/mailman/listinfo/libguestfs
