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Re: [Xen-users] lost root password in guest

To: Robert Threet <rthreet@xxxxxxxxxxxx>
Subject: Re: [Xen-users] lost root password in guest
From: Erwan RENIER <erwan.renier@xxxxxxxxxxx>
Date: Tue, 10 May 2011 18:06:17 +0200
Cc: xen-users@xxxxxxxxxxxxxxxxxxx, Igor Serebryany <igor47@xxxxxxxxxxx>
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You probably have dos partitions on your disk images
to make them aviable :
#rmmod loop
#modprobe loop max_part=63

Mount your images with losetup

you will now have devices like :

/dev/loop0p0
/dev/loop0p1

Wich are the dos partitions on your disk images
You should be able to mount them.

If you have lvm partitions, instead of mounting the loop device  :
#vgscan
#vgchange -ay
your lvs should be avaible in /dev/<vgname>/
unless you named your guest vg like an existing vg on the host in wich case you 
have to rename the vg on the host ( it seems it can be done without unmounting 
, don't forget to revert )


Le 10/05/2011 17:33, Robert Threet a écrit :
Still having issues.  I ran losetup twice - problem?  Also - I did not
creat a separate LVM filesystem for vutil - it just created the flat
file in  /var/lib/xen/images/vutil.img.  vutil is down.

[root@basket ~]# losetup -a
/dev/loop0: [fd00]:79331424 (/var/lib/xen/images/vutil.img)
/dev/loop1: [fd00]:79331424 (/var/lib/xen/images/vutil.img)
[root@basket ~]# mount /dev/loop0 /mnt
mount: /dev/loop0 already mounted or /mnt busy
[root@basket ~]# umount /dev/loop0
umount: /dev/loop0: not mounted
[root@basket ~]# mount /dev/loop1 /mnt
mount: you must specify the filesystem type
[root@basket ~]# mount -t ext4 /dev/loop1 /mnt
mount: wrong fs type, bad option, bad superblock on /dev/loop1,
        missing codepage or other error
        In some cases useful info is found in syslog - try
        dmesg | tail  or so

[root@basket ~]# mount -t ext3 /dev/loop1 /mnt
mount: wrong fs type, bad option, bad superblock on /dev/loop1,
        missing codepage or other error
        In some cases useful info is found in syslog - try
        dmesg | tail  or so

[root@basket ~]# xm list
Name                                      ID Mem(MiB) VCPUs State   Time(s)
Domain-0                                   0     9333     4 r-----  91413.4
lnximag1                                   4     1027     1 -b----   2355.5
vauction                                  16     1024     1 -b----   3029.8
vlists                                    19     1026     1 -b----    746.2
vpipelin                                  20     1027     1 -b----    518.8


On 05/09/2011 04:41 PM, Igor Serebryany wrote:
just do 'mount /dev/loop0 /mnt' -- once you've done losetup you don't
need the -o loop anymore.

--igor

On Mon, May 09, 2011 at 03:57:16PM -0500, Robert Threet wrote:
I can't seem to mount the local disk image:

[root@basket mapper]# losetup -f /var/lib/xen/images/vutil.img
[root@basket mapper]# losetup -a
/dev/loop0: [fd00]:79331424 (/var/lib/xen/images/vutil.img)

[root@basket mapper]# mount -o loop -t ext4 /dev/loop0 /mnt
mount: wrong fs type, bad option, bad superblock on /dev/loop2,
        missing codepage or other error
        In some cases useful info is found in syslog - try
        dmesg | tail  or so

--
Robert Threet
http://yesistilluseperl.blogspot.com/

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