原文链接 https://liutaihua.github.io/2013/03/07/mount-kvm-img.html
注：以下为加速网络访问所做的原文缓存，经过重新格式化，可能存在格式方面的问题，或偶有遗漏信息，请以原文为准。
kvm的guest镜像可以mount到本地 首先使用qemu-img info img_file查看镜像使用的文件格式, 通常默认的是raw
[root@ttt data]# qemu-img info vm1.img
image: vm1.img
file format: raw
virtual size: 20G (21474836480 bytes)
disk size: 11G
然后可使用fdisk查看guest使用此镜像时的分区方式:
[root@ttt data]# fdisk -ul vm1.img You must set cylinders. You can do this from the extra functions menu.
Disk vm1.img: 0 MB, 0 bytes 255 heads, 63 sectors/track, 0 cylinders, total 0 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x0008de38
Device Boot Start End Blocks Id System vm1.img1 2048 8194047 4096000 82 Linux swap / Solaris Partition 1 does not end on cylinder boundary. vm1.img2 * 8194048 41943039 16874496 83 Linux Partition 2 has different physical/logical endings: phys=(1023, 254, 63) logical=(2610, 212, 34)
如果是典型的raw方式, 且guest使用的不是lvm的分区管理方式,那方式很简单: losetup /dev/loop0 image.img kpartx -a /dev/loop0mount /dev/mapper/loop0p1 /mnt/image 这样就完成了mount到本地的目的.
以下资料是当img是qcow2或这kvm的guest使用的lvm逻辑卷管理方式时, 如何mount镜像到本地的方法:
Mounting a partition from raw image is pretty simple:
losetup /dev/loop0 image.img kpartx -a /dev/loop0 mount /dev/mapper/loop0p1 /mnt/image If kernel parameter (as loop in compiled into Fedora’s kernel) like loop.max_part=63 added it is even simplier: losetup /dev/loop0 image.img mount /dev/loop0p1 /mnt/image Alternative way is to specify direct offset to partition: mount image.img /mnt/image -o loop,offset=32256
To mount qcow2 images there is (at least in F-11 qemu) very useful qemu-nbd util. It shares image through kernel network block device protocol and this allows to mount it: modprobe nbd max_part=63 qemu-nbd -c /dev/nbd0 image.img mount /dev/nbd0p1 /mnt/image
If LVM is present on image it could be initialized with: vgscan vgchange -ay mount /dev/VolGroupName/LogVolName /mnt/image
Finishing is done with (depending on how it was initalized): umount /mnt/image vgchange -an VolGroupName killall qemu-nbd kpartx -d /dev/loop0 losetup -d /dev/loop0
Posted by Alexey Torkhov at 16:33 Labels: Fedora