acessing lvm2 partition in ubuntu as normal user

sumeet inani · 07-01-2013, 03:36 AM

Hi ,
I had RHEL 6 installed on my hard disk. boot partition was sda5 while / was sda6 (lvm2 type).
Now I run ubuntu 12.04

Code:

lxuser@lxuser-Pegatron:~$ cat /etc/debian_version 
wheezy/sid
lxuser@lxuser-Pegatron:~$ lsb_release  -a
No LSB modules are available.
Distributor ID:	Ubuntu
Description:	Ubuntu 12.04.2 LTS
Release:	12.04
Codename:	precise
lxuser@lxuser-Pegatron:~$ uname -a
Linux lxuser-Pegatron 3.5.0-23-generic #35~precise1-Ubuntu SMP Fri Jan 25 17:15:33 UTC 2013 i686 i686 i386 GNU/Linux

I read http://quonn.wordpress.com/2010/12/0...ion-on-ubuntu/
I did follwing

Code:

root@lxuser-Pegatron:~# pvscan
  PV /dev/sda6   VG VolGroup00   lvm2 [221.50 GiB / 0    free]
  Total: 1 [221.50 GiB] / in use: 1 [221.50 GiB] / in no VG: 0 [0   ]
root@lxuser-Pegatron:~# vgscan
  Reading all physical volumes.  This may take a while...
  Found volume group "VolGroup00" using metadata type lvm2
root@lxuser-Pegatron:~# vgchange -a y
  2 logical volume(s) in volume group "VolGroup00" now active
root@lxuser-Pegatron:~# lvscan
  ACTIVE            '/dev/VolGroup00/LogVol00' [215.72 GiB] inherit
  ACTIVE            '/dev/VolGroup00/LogVol01' [5.78 GiB] inherit
root@lxuser-Pegatron:~# mkdir /vol1 /vol0
root@lxuser-Pegatron:~# mount /dev/VolGroup00/LogVol00 /vol0
root@lxuser-Pegatron:~# mount /dev/VolGroup00/LogVol01 /vol1
/dev/mapper/VolGroup00-LogVol01 looks like swapspace - not mounted
mount: you must specify the filesystem type
root@lxuser-Pegatron:~# df
Filesystem                      1K-blocks     Used Available Use% Mounted on
/dev/sda3                       151192780  3710896 139801732   3% /
udev                              2037016        4   2037012   1% /dev
tmpfs                              817968      856    817112   1% /run
none                                 5120        0      5120   0% /run/lock
none                              2044916      320   2044596   1% /run/shm
/dev/sda5                          101086    12835     83032  14% /media/_boot
/dev/mapper/VolGroup00-LogVol00 219113100 91972672 115830556  45% /vol0

Only , the problem is I cannot access some folders of vol0 as normal user.
example

Code:

lxuser@lxuser-Pegatron:~$ ls -al /vol0/home/rajesh/
ls: cannot open directory /vol0/home/rajesh/: Permission denied

chrism01 · 07-01-2013, 07:04 PM

Try

Code:

ls -l /

which will show you the ownerships/perms.

sumeet inani · 07-01-2013, 11:26 PM

Code:

$ ls -al /vol0/home/
total 36
drwxr-xr-x.  3 root root  4096 Feb 22  2011 .
drwxr-xr-x. 25 root root  4096 Jun 28 14:42 ..
drwx------  59  500  500 20480 Jun 27 22:46 rajesh

Is there a way I can mount this partition such that it is accessible to everyone ?

chrism01 · 07-02-2013, 01:01 AM

I don't know where you got the LVM from, but that shows that the original owner & group no longer exist, hence it showing a numeric uid/gid instead of matching user/group.
You can use chown to change those values, but think about who you want the new user/grp to be.

sumeet inani · 07-02-2013, 01:58 AM

that lvm is the root partition of RHEL (installed previously) . Its /boot was sda5.
If I change the ownership using 'chown -R lxuser:lxuser /vol0/home/rajesh'
i fear that while booting RHEL , I will get problem .

chrism01 · 07-02-2013, 02:12 AM

You've only shown the content of /vol0/home, not content of / as asked, which would show show ownership/perms of the volume /vol0.
All that above shows is that 'rajesh' had a home dir under the uid/gid of 500/500, but those uid/gid entries no longer exist in /etc/passwd, /etc/shadow, /etc/group.

sumeet inani · 07-02-2013, 03:11 AM

Here it goes

Code:

$ ls -l /
total 116
drwxr-xr-x    2 root root  4096 Jun 28 04:55 bin
drwxr-xr-x    3 root root  4096 Jun 28 16:53 boot
drwxr-xr-x    2 root root  4096 Jun 28 04:47 cdrom
drwxr-xr-x   16 root root  4340 Jul  1 17:18 dev
drwxr-xr-x  131 root root 12288 Jul  2 11:23 etc
drwxr-xr-x    3 root root  4096 Jun 28 04:47 home
lrwxrwxrwx    1 root root    32 Jun 28 04:54 initrd.img -> boot/initrd.img-3.5.0-23-generic
lrwxrwxrwx    1 root root    33 Jun 28 04:43 initrd.img.old -> /boot/initrd.img-3.5.0-23-generic
drwxr-xr-x   21 root root  4096 Jun 28 04:55 lib
drwx------    2 root root 16384 Jun 28 04:40 lost+found
drwxr-xr-x    3 root root  4096 Jul  2 11:23 media
drwxr-xr-x    3 root root  4096 Jun 28 16:56 mnt
drwxr-xr-x    2 root root  4096 Feb 14 03:37 opt
dr-xr-xr-x  200 root root     0 Jun 28 21:43 proc
drwxr-xr-x    2 root root  4096 Jun 28 05:09 rhboot
drwx------    6 root root  4096 Jun 28 17:01 root
drwxr-xr-x   20 root root   740 Jul  1 14:28 run
drwxr-xr-x    2 root root 12288 Jun 28 16:52 sbin
drwxr-xr-x    2 root root  4096 Mar  5  2012 selinux
drwxr-xr-x    2 root root  4096 Feb 14 03:37 srv
dr-xr-xr-x   13 root root     0 Jun 28 21:43 sys
drwxrwxrwt   12 root root  4096 Jul  2 13:17 tmp
drwxr-xr-x    2 root root  4096 Jun 28 04:43 ubiquity-apt-clone
drwxr-xr-x   10 root root  4096 Feb 14 03:37 usr
drwxr-xr-x   13 root root  4096 Jun 28 15:34 var
lrwxrwxrwx    1 root root    29 Jun 28 04:54 vmlinuz -> boot/vmlinuz-3.5.0-23-generic
drwxr-xr-x.  25 root root  4096 Jun 28 14:42 vol0
drwxr-xr-x    2 root root  4096 Jul  1 13:59 vol1

sumeet inani · 07-05-2013, 12:18 AM

can somebody tell me way to mount lvm partition accessible to all users ?