0n Tue, Feb 02, 2010 at 12:34:46PM +0900, sf...@users.sourceforge.net
wrote:
>"Wilkinson, Alex":
>> >> (generic)
>> >> $ mkdir /tmp/empty
>> >> # mount -o bind /tmp/empty /mnt/aufs/you/want/to/hide
>>
>> This works great! However, it doesnt look like i can add this to
fstab(5).
>> How would one normally get this automagically mounted ? rc.local ?
>> Is it possible to use AutoFS to automagically do a --bind mount ?
>
>If you put the aufs entry in your fstab, try writing
>
>/empty /mnt/aufs/you/want/to/hide none bind 0 0
>
>after the aufs line.
>Of course, you need to create /empty dir before you reboot.
>
>But if your mount(8) behaves asynchronously, it may not work.
Well it works! But i have a strange permissions issue even though it appears
permissions are correct. Here is my recipie:
1. mount fs over nfs (fstab)
host-a:/export/foo/data /mnt/host-a nfs rw,soft,intr 0 0
host-b:/export /mnt/host-b nfs rw,soft,intr 0 0
2. rebind individual directories within the aforementioned NFS mounts (fstab)
/mnt/host-a/ss/matlab /mnt/data/matlab none rw,bind 0 0
/mnt/host-b/mod/data /mnt/data/rdl none rw,bind 0 0
3. Join aforementioned individual directories into a single logical directory
[/etc/rc.local]
/bin/mount --rbind /mnt/host-a/ss/matlab /mnt/data/matlab
/bin/mount --rbind /mnt/host-b/mod/data/rdl /mnt/data/rdl
4. IT WORKS! But ... i get permission errors:
#ls -l
drwxrwx--- 22 root ss 8192 Jan 29 15:25 matlab/
drwxrws--- 9 root ss 8192 Jan 29 15:58 rdl/
#cd matlab/
matlab/: Permission denied.
#id -a | tr ',' \\n | grep ss
18010(ss)
#
Do i have to pass mount(8) an option to interpret perms correctly on a bind
mount ? FWIW root can happily traverse the bind mounts.
-Alex
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