Difference between revisions of "Virtual filesystem images"
From lippmann wiki
| Line 1: | Line 1: | ||
=kpartx= | =kpartx= | ||
| − | if you have a raw disk image, for example a disk drive for a hypervisor | + | 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: | ||
| Line 6: | Line 6: | ||
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 | ||
| Line 17: | Line 17: | ||
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 | ||
| Line 25: | Line 25: | ||
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 | ||
Revision as of 04:24, 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
