Virtual filesystem images: Difference between revisions
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(Created page with "if you have a raw disk image, for example a disk drive for a hypervisor (raw file or vmdk) it may have multiple partitions. to quickly create devices for these you can use kp...") |
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if you have a raw disk image, for example a disk drive for a hypervisor | =kpartx= | ||
if you have a raw disk image, for example a disk drive for a hypervisor it may have multiple partitions. | |||
to quickly create devices for these you can use kpartx. after they are created you can mount these devices on your filesystem: | to quickly create devices for these you can use kpartx. after they are created you can mount these devices on your filesystem: | ||
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e.g.: | e.g.: | ||
[ | [maarten@rkvm1 select_fun] sudo kpartx -v -a DataONTAPv-kvm.raw | ||
add map loop1p1 (253:3): 0 66464 linear 7:1 64 | add map loop1p1 (253:3): 0 66464 linear 7:1 64 | ||
add map loop1p2 (253:4): 0 8390592 linear 7:1 66528 | add map loop1p2 (253:4): 0 8390592 linear 7:1 66528 | ||
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and these are now visible in /dev/mapper: | and these are now visible in /dev/mapper: | ||
[ | |||
[maarten@rkvm1 select_fun] ls -lrt /dev/mapper/ |grep loop | |||
lrwxrwxrwx. 1 root root 7 Jan 29 20:12 loop1p1 -> ../dm-3 | lrwxrwxrwx. 1 root root 7 Jan 29 20:12 loop1p1 -> ../dm-3 | ||
lrwxrwxrwx. 1 root root 7 Jan 29 20:12 loop1p2 -> ../dm-4 | lrwxrwxrwx. 1 root root 7 Jan 29 20:12 loop1p2 -> ../dm-4 | ||
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lrwxrwxrwx. 1 root root 7 Jan 29 20:12 loop1p6 -> ../dm-8 | lrwxrwxrwx. 1 root root 7 Jan 29 20:12 loop1p6 -> ../dm-8 | ||
lrwxrwxrwx. 1 root root 7 Jan 29 20:12 loop1p7 -> ../dm-9 | lrwxrwxrwx. 1 root root 7 Jan 29 20:12 loop1p7 -> ../dm-9 | ||
this does not seem to work well on vmdk images. As a result. | |||
=mount a vmdk= | |||
for a vmdk it seems other tools work better. qemu will do the trick | |||
first create an ndb device | |||
[maarten@rkvm1 select_fun] sudo modprobe nbd | |||
now have it create the devices for the different partions | |||
[maarten@rkvm1 select_fun] sudo qemu-nbd -r -c /dev/nbd1 DataONTAPv.vmdk | |||
[maarten@rkvm1 select_fun] ls -al /dev/nbd1p* | |||
brw-rw----. 1 root disk 43, 33 Jan 29 20:21 /dev/nbd1p1 | |||
brw-rw----. 1 root disk 43, 34 Jan 29 20:21 /dev/nbd1p2 | |||
brw-rw----. 1 root disk 43, 35 Jan 29 20:21 /dev/nbd1p3 | |||
brw-rw----. 1 root disk 43, 36 Jan 29 20:21 /dev/nbd1p4 | |||
brw-rw----. 1 root disk 43, 37 Jan 29 20:21 /dev/nbd1p5 | |||
brw-rw----. 1 root disk 43, 38 Jan 29 20:21 /dev/nbd1p6 | |||
brw-rw----. 1 root disk 43, 39 Jan 29 20:21 /dev/nbd1p7 | |||
(with help from https://jasonmurray.org/posts/2021/mountvmdk/, he goes into more detail) | |||
[maarten@rkvm1 select_fun] sudo mount /dev/nbd1p2 /mnt/source/ | |||
mount: /mnt/source: WARNING: source write-protected, mounted read-only. | |||
[maarten@rkvm1 select_fun] ls -l /mnt/source/ | |||
total 96 | |||
drwxr-xr-x. 2 root root 32768 Dec 11 03:41 env | |||
drwxr-xr-x. 2 root root 32768 Dec 11 04:06 files | |||
drwxr-xr-x. 3 root root 32768 Dec 11 03:40 x86_64 | |||
Latest revision as of 04:27, 30 January 2024
kpartx
if you have a raw disk image, for example a disk drive for a hypervisor it may have multiple partitions.
to quickly create devices for these you can use kpartx. after they are created you can mount these devices on your filesystem:
e.g.:
[maarten@rkvm1 select_fun] sudo kpartx -v -a DataONTAPv-kvm.raw add map loop1p1 (253:3): 0 66464 linear 7:1 64 add map loop1p2 (253:4): 0 8390592 linear 7:1 66528 add map loop1p3 (253:5): 0 42336 linear 7:1 8457120 add map loop1p4 (253:6): 0 2 linear 7:1 8499456 add map loop1p5 (253:7): 0 3146976 linear 7:1 8500464 add map loop1p6 (253:8): 0 4196304 linear 7:1 11648448 add map loop1p7 (253:9): 0 5040 linear 7:1 15845760
and these are now visible in /dev/mapper:
[maarten@rkvm1 select_fun] ls -lrt /dev/mapper/ |grep loop lrwxrwxrwx. 1 root root 7 Jan 29 20:12 loop1p1 -> ../dm-3 lrwxrwxrwx. 1 root root 7 Jan 29 20:12 loop1p2 -> ../dm-4 lrwxrwxrwx. 1 root root 7 Jan 29 20:12 loop1p3 -> ../dm-5 lrwxrwxrwx. 1 root root 7 Jan 29 20:12 loop1p4 -> ../dm-6 lrwxrwxrwx. 1 root root 7 Jan 29 20:12 loop1p5 -> ../dm-7 lrwxrwxrwx. 1 root root 7 Jan 29 20:12 loop1p6 -> ../dm-8 lrwxrwxrwx. 1 root root 7 Jan 29 20:12 loop1p7 -> ../dm-9
this does not seem to work well on vmdk images. As a result.
mount a vmdk
for a vmdk it seems other tools work better. qemu will do the trick
first create an ndb device
[maarten@rkvm1 select_fun] sudo modprobe nbd
now have it create the devices for the different partions
[maarten@rkvm1 select_fun] sudo qemu-nbd -r -c /dev/nbd1 DataONTAPv.vmdk
[maarten@rkvm1 select_fun] ls -al /dev/nbd1p* brw-rw----. 1 root disk 43, 33 Jan 29 20:21 /dev/nbd1p1 brw-rw----. 1 root disk 43, 34 Jan 29 20:21 /dev/nbd1p2 brw-rw----. 1 root disk 43, 35 Jan 29 20:21 /dev/nbd1p3 brw-rw----. 1 root disk 43, 36 Jan 29 20:21 /dev/nbd1p4 brw-rw----. 1 root disk 43, 37 Jan 29 20:21 /dev/nbd1p5 brw-rw----. 1 root disk 43, 38 Jan 29 20:21 /dev/nbd1p6 brw-rw----. 1 root disk 43, 39 Jan 29 20:21 /dev/nbd1p7
(with help from https://jasonmurray.org/posts/2021/mountvmdk/, he goes into more detail)
[maarten@rkvm1 select_fun] sudo mount /dev/nbd1p2 /mnt/source/ mount: /mnt/source: WARNING: source write-protected, mounted read-only. [maarten@rkvm1 select_fun] ls -l /mnt/source/ total 96 drwxr-xr-x. 2 root root 32768 Dec 11 03:41 env drwxr-xr-x. 2 root root 32768 Dec 11 04:06 files drwxr-xr-x. 3 root root 32768 Dec 11 03:40 x86_64