Linux qemu-nbd mount qemu disk image
deepin@deepin:~$ deepin@deepin:~$ qemu-nbd --help Usage: qemu-nbd [OPTIONS] FILE QEMU Disk Network Block Device Server -h, --help display this help and exit -V, --version output version information and exit Connection properties: -p, --port=PORT port to listen on (default `10809') -b, --bind=IFACE interface to bind to (default `0.0.0.0') -k, --socket=PATH path to the unix socket (default '/var/lock/qemu-nbd-DEVICE') -e, --shared=NUM device can be shared by NUM clients (default '1') -t, --persistent don't exit on the last connection -v, --verbose display extra debugging information -x, --export-name=NAME expose export by name -D, --description=TEXT with -x, also export a human-readable description Exposing part of the image: -o, --offset=OFFSET offset into the image -P, --partition=NUM only expose partition NUM General purpose options: --object type,id=ID,... define an object such as 'secret' for providing passwords and/or encryption keys -T, --trace [[enable=]<pattern>][,events=<file>][,file=<file>] specify tracing options --fork fork off the server process and exit the parent once the server is running Kernel NBD client support: -c, --connect=DEV connect FILE to the local NBD device DEV -d, --disconnect disconnect the specified device Block device options: -f, --format=FORMAT set image format (raw, qcow2, ...) -r, --read-only export read-only -s, --snapshot use FILE as an external snapshot, create a temporary file with backing_file=FILE, redirect the write to the temporary one -l, --load-snapshot=SNAPSHOT_PARAM load an internal snapshot inside FILE and export it as an read-only device, SNAPSHOT_PARAM format is 'snapshot.id=[ID],snapshot.name=[NAME]', or '[ID_OR_NAME]' -n, --nocache disable host cache --cache=MODE set cache mode (none, writeback, ...) --aio=MODE set AIO mode (native or threads) --discard=MODE set discard mode (ignore, unmap) --detect-zeroes=MODE set detect-zeroes mode (off, on, unmap) --image-opts treat FILE as a full set of image options See <http://qemu.org/contribute/report-a-bug> for how to report bugs. More information on the QEMU project at <http://qemu.org>. deepin@deepin:~$ deepin@deepin:~$ deepin@deepin:~$ grep NBD /boot/config-4.4.102-deepin-server CONFIG_BLK_DEV_NBD=m deepin@deepin:~$ deepin@deepin:~$ modinfo nbd filename: /lib/modules/4.4.102-deepin-server/kernel/drivers/block/nbd.ko license: GPL description: Network Block Device depends: intree: Y vermagic: 4.4.102-deepin-server SMP mod_unload modversions aarch64 parm: nbds_max:number of network block devices to initialize (default: 16) (int) parm: max_part:number of partitions per device (default: 0) (int) deepin@deepin:~$ deepin@deepin:~$ sudo modprobe nbd max_part=16 deepin@deepin:~$ deepin@deepin:~$ sudo ls -al /dev/nbd* brw-rw---- 1 root disk 43, 0 2月 18 18:33 /dev/nbd0 brw-rw---- 1 root disk 43, 1 2月 18 18:33 /dev/nbd1 brw-rw---- 1 root disk 43, 10 2月 18 18:33 /dev/nbd10 brw-rw---- 1 root disk 43, 11 2月 18 18:33 /dev/nbd11 brw-rw---- 1 root disk 43, 12 2月 18 18:33 /dev/nbd12 brw-rw---- 1 root disk 43, 13 2月 18 18:33 /dev/nbd13 brw-rw---- 1 root disk 43, 14 2月 18 18:33 /dev/nbd14 brw-rw---- 1 root disk 43, 15 2月 18 18:33 /dev/nbd15 brw-rw---- 1 root disk 43, 2 2月 18 18:33 /dev/nbd2 brw-rw---- 1 root disk 43, 3 2月 18 18:33 /dev/nbd3 brw-rw---- 1 root disk 43, 4 2月 18 18:33 /dev/nbd4 brw-rw---- 1 root disk 43, 5 2月 18 18:33 /dev/nbd5 brw-rw---- 1 root disk 43, 6 2月 18 18:33 /dev/nbd6 brw-rw---- 1 root disk 43, 7 2月 18 18:33 /dev/nbd7 brw-rw---- 1 root disk 43, 8 2月 18 18:33 /dev/nbd8 brw-rw---- 1 root disk 43, 9 2月 18 18:33 /dev/nbd9 deepin@deepin:~$ deepin@deepin:~$ sudo qemu-nbd --connect=/dev/nbd0 ./vans-kvm.qcow2 --nocache deepin@deepin:~$ sudo fdisk /dev/nbd0 deepin@deepin:~$ sudo ls -l /dev/nbd0* deepin@deepin:~$ deepin@deepin:~$ sudo mkdir -p /mnt/img deepin@deepin:~$ sudo chmod 777 /mnt/img deepin@deepin:~$ deepin@deepin:~$ sudo mount /dev/nbd0p1 /mnt/img/ deepin@deepin:~$ sudo ls /mnt/img deepin@deepin:~$ deepin@deepin:~$ deepin@deepin:~$ sudo umount /mnt/img deepin@deepin:~$ sudo qemu-nbd --disconnect /dev/nbd0 deepin@deepin:~$
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