通过qemu-nbd方式挂载qcow2镜像格式
一、查看NBD（Network Block Device）信息
# modinfo nbd
filename: /lib/modules/3.11.10-301.fc20.x86_64/kernel/drivers/block/nbd.ko
license: GPL
description: Network Block Device
depends:
intree: Y
vermagic: 3.11.10-301.fc20.x86_64 SMP mod_unload
signer: Fedora kernel signing key
sig_key: 03:59:1D:C5:7A:69:07:41:40:1A:1C:20:2E:2B:3D:9F:4F:ED:2A:0E
sig_hashalgo: sha256
parm: nbds_max:number of network block devices to initialize (default: 16) (int)
parm: max_part:number of partitions per device (default: 0) (int)
parm: debugflags:flags for controlling debug output (int)
# modprobe nbd max_part=16
# lsmod | grep nbd
nbd 175540
二、将qcow2镜像映射为网络设备（NBD）
# qemu-nbd -c /dev/n
nbd0 nbd11 nbd14 nbd3 nbd6 nbd9 network_throughput
nbd1 nbd12 nbd15 nbd4 nbd7 net/ null
nbd10 nbd13 nbd2 nbd5 nbd8 network_latency nvram
# qemu-nbd -c /dev/nbd0 /var/lib/libvirt/images/ubuntu.img
# ll /dev/nbd0*
brw-rw----. 1 root disk 43, 0 Jun 23 15:16 /dev/nbd0
brw-rw----. 1 root disk 43, 1 Jun 23 15:16 /dev/nbd0p1
brw-rw----. 1 root disk 43, 2 Jun 23 15:16 /dev/nbd0p2
brw-rw----. 1 root disk 43, 5 Jun 23 15:16 /dev/nbd0p5
三、挂载qcow2镜像中的分区
# mount /dev/nbd0p1 /imgage/
# ll /imgage/
total 92
drwxr-xr-x.2 root root4096 May 27 08:53 bin
drwxr-xr-x.3 root root4096 May 27 08:59 boot
drwxr-xr-x.3 root root4096 May 26 18:24 dev
drwxr-xr-x. 89 root root4096 Jun 23 14:48 etc
drwxr-xr-x.3 root root4096 May 27 08:59 home
lrwxrwxrwx.1 root root 33 May 26 18:25 initrd.img -> boot/initrd.img-3.13.0-24-generic
drwxr-xr-x. 21 root root4096 May 27 08:53 lib
drwxr-xr-x.2 root root4096 May 26 18:24 lib64
drwx------.2 root root 16384 May 26 18:24 lost+found
drwxr-xr-x.3 root root4096 May 26 18:24 media
drwxr-xr-x.2 root root4096 Apr 11 06:12 mnt
drwxr-xr-x.2 root root4096 Apr 17 05:02 opt
drwxr-xr-x.2 root root4096 Apr 11 06:12 proc
drwx------.3 root root4096 May 27 09:28 root
drwxr-xr-x.2 root root4096 May 27 09:07 run
drwxr-xr-x.2 root root4096 May 27 09:07 sbin
drwxr-xr-x.2 root root4096 Apr 17 05:02 srv
drwxr-xr-x.2 root root4096 Mar 13 09:41 sys
drwxrwxrwt.2 root root4096 Jun 23 15:17 tmp
drwxr-xr-x. 10 root root4096 May 26 18:24 usr
drwxr-xr-x. 12 root root4096 May 27 08:55 var
lrwxrwxrwx.1 root root 30 May 26 18:25 vmlinuz -> boot/vmlinuz-3.13.0-24-generic
四、umount分区，接触qcow2与nbd设备的关联
# umount /imgage
# qemu-nbd -d /dev/nbd0
/dev/nbd0 disconnected
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