[CentOS] mount bind problem
望月忠雄
tadao at creative-japan.org
Thu Apr 14 01:44:55 UTC 2016
Dear Robert,
Thank you.
The state after reboot are as follows.
# LANG=C lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sr0 11:0 1 1024M 0 rom
vda 252:0 0 15G 0 disk
|-vda1 252:1 0 500M 0 part /boot
`-vda2 252:2 0 14.5G 0 part
|-VolGroup-lv_root (dm-0) 253:0 0 12.5G 0 lvm /
`-VolGroup-lv_swap (dm-1) 253:1 0 2G 0 lvm [SWAP]
vdb 252:16 0 40G 0 disk /mnt/extradiskA
# mount
/dev/mapper/VolGroup-lv_root on / type ext4 (rw,usrquota,grpquota)
proc on /proc type proc (rw)
sysfs on /sys type sysfs (rw)
devpts on /dev/pts type devpts (rw,gid=5,mode=620)
tmpfs on /dev/shm type tmpfs (rw)
/dev/vda1 on /boot type ext4 (rw)
/dev/vdb on /mnt/extradiskA type ext4 (rw,usrquota,grpquota)
/mnt/extradiskA/home on /home type none (rw,bind)
/mnt/extradiskA/log on /var/log type none (rw,bind)
/mnt/extradiskA/mysql on /var/lib/mysql type none (rw,bind)
/mnt/extradiskA/.backup on /.backup type none (rw,bind)
/mnt/extradiskA/.daily_backup on /.daily_backup type none (rw,bind)
/mnt/extradiskA/backups on /var/backups type none (rw,bind)
none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw)
/dev/vdb on /home type ext4
(rw,relatime,barrier=1,data=ordered,usrquota,grpquota)
# ls -l /home
total 48
-rw------- 1 root root 7168 Nov 15 19:10 aquota.group
-rw------- 1 root root 7168 Apr 14 10:22 aquota.user
drwxr-x--- 2 root root 4096 Jan 18 21:55 backups
drwxr-xr-x 4 root root 4096 Jan 1 11:59 home
drwxr-xr-x 8 root root 4096 Apr 14 10:23 log
drwx------ 2 root root 16384 Nov 15 18:58 lost+found
drwxr-xr-x 6 mysql mysql 4096 Apr 14 10:24 mysql
# ls -al /mnt/extradiskA
total 72
drwxr-xr-x 9 root root 4096 Nov 15 19:10 .
drwxr-xr-x. 3 root root 4096 Nov 15 19:00 ..
-rw------- 1 root root 7168 Nov 15 19:10 aquota.group
-rw------- 1 root root 7168 Apr 14 10:22 aquota.user
drwxr-xr-x 2 root root 12288 Apr 14 00:00 .backup
drwxr-x--- 2 root root 4096 Jan 18 21:55 backups
drwxr-xr-x 2 root root 4096 Nov 16 02:30 .daily_backup
drwxr-xr-x 4 root root 4096 Jan 1 11:59 home
drwxr-xr-x 8 root root 4096 Apr 14 10:23 log
drwx------ 2 root root 16384 Nov 15 18:58 lost+found
drwxr-xr-x 6 mysql mysql 4096 Apr 14 10:24 mysql
# ls -al /mnt/extradiskA/home
total 16
drwxr-xr-x 4 root root 4096 Jan 1 11:59 .
drwxr-xr-x 9 root root 4096 Nov 15 19:10 ..
drwxr-xr-x. 7 admin admin 4096 Sep 21 2015 admin
drwxr-xr-x 4 kavfile kavfile 4096 Jan 1 12:00 kavfile
# mkdir /tmp/tmproot
# mount --bind / /tmp/tmproot
# ls -a /tmp/tmproot/mnt/extradiskA
. ..
# cat /etc/fstab
#
# /etc/fstab
# Created by anaconda on Mon Jul 28 08:21:01 2014
#
# Accessible filesystems, by reference, are maintained under '/dev/disk'
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
#
/dev/mapper/VolGroup-lv_root / ext4
defaults,usrquota,grpquota 1 1
UUID=9a855356-ee00-4ae7-a185-226566ce1dba /boot ext4
defaults 1 2
UUID=093c9b95-8336-4682-9927-132dbdf2f082 /mnt/extradiskA ext4
defaults,usrquota,grpquota 1 2
/dev/mapper/VolGroup-lv_swap swap swap defaults
0 0
tmpfs /dev/shm tmpfs defaults 0 0
devpts /dev/pts devpts gid=5,mode=620 0 0
sysfs /sys sysfs defaults 0 0
proc /proc proc defaults 0 0
/mnt/extradiskA/home /home none bind 0 0
/mnt/extradiskA/log /var/log none bind 0 0
/mnt/extradiskA/mysql /var/lib/mysql none bind 0 0
/mnt/extradiskA/.backup /.backup none bind 0 0
/mnt/extradiskA/.daily_backup /.daily_backup none bind 0 0
/mnt/extradiskA/backups /var/backups none bind 0 0
2016-04-13 23:32 GMT+09:00 Robert Nichols <rnicholsNOSPAM at comcast.net>:
> On 04/13/2016 12:02 AM, 望月忠雄 wrote:
>
>> In /etc/rc.d/rc.sysinit,
>> there's "mount -a -n -t nonfs,nfs4,smbfs,ncpfs,cifs,gfs,gfs2i,glusterfs -O
>> no_netdev".
>>
>>
>> I have other same type servers. And on other servers with same /etc/fstsb,
>> file system is correct.
>> There's no difference between normal server's rc.sysinit and this problem
>> server's rc.sysinit too.
>>
>
> It's not apparent how /dev/vdb (the whole filesystem) came to be mounted
> on both /mnt/extradiskA and /home. Let's see the output
> from "lsblk" and "mount". Did you look in /mnt/extradiskA/home
> and verify that just the expected user directories are there
> (no "/mnt/extradiskA/home/home")?
>
> It might also be worthwhile to verify that the mount point
> directory /mnt/extradiskA in the root filesystem is empty. If
> there happens to be a /mnt/extradiskA/home directory present
> before /dev/vdb gets mounted, that could allow the mounts to
> be performed out of order, though I don't really see how that
> could lead the to result you have.
>
> mkdir /tmp/tmproot
> mount --bind / /tmp/tmproot
> ls -a /tmp/tmproot/mnt/extradiskA
> umount /tmp/tmproot
>
>
> --
> Bob Nichols "NOSPAM" is really part of my email address.
> Do NOT delete it.
>
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