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frippz
Guru
Joined: 22 Aug 2002
Posts: 460
Location: Sweden
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 Posted: Sun Apr 27, 2003 3:00 pm Post subject: Mounting directories within mounted directories |
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My friend and I are setting up an FTP server using ProFTPd. Now we're having some problems with mounted directories. Now, when you're mounting several directories, it can become quite confusing so I hope I'm getting through to everyone here. Ok, here we go. Let me first post my fstab and the results of "mount"
| Code: |
# /etc/fstab: static file system information.
# $Header: /home/cvsroot/gentoo-src/rc-scripts/etc/fstab,v 1.10 2002/11/18 19:39:22 azarah Exp $
#
# noatime turns of atimes for increased performance (atimes normally aren't
# needed; notail increases performance of ReiserFS (at the expense of storage
# efficiency). It's safe to drop the noatime options if you want and to
# switch between notail and tail freely.
# <fs> <mountpoint> <type> <opts> <dump/pass>
# NOTE: If your BOOT partition is ReiserFS, add the notail option to opts.
/dev/hda1 /boot ext3 noauto,noatime 1 2
/dev/hda3 / ext3 noatime 0 1
/dev/hda4 /home ext3 noatime 0 2
/dev/hda2 none swap sw 0 0
/dev/hdb1 /mnt/sg20 ext3 noatime 0 2
/dev/hdc1 /mnt/sg60 ext3 noatime 0 2
/dev/cdroms/cdrom0 /mnt/cdrom iso9660 noauto,ro 0 0
proc /proc proc defaults 0 0
# Netmounts
# <fs> <mountpoint> <type> <opts> <dump/pass>
//zax/pub4 /home/ftp/disk3 smbfs credentials=/home/chrillo/.zax,uid=chrillo,gid=users 0 0
# Mounted folders (mount --bind)
# NOTE: These are just examples of how it can be done. If you want mounted folders to survive
# a reboot, they must be in here. The syntax is quite simple, so you'll get the hang of it! ;)
# <fs> <mountpoint> <type> <opts>
/mnt/sg20/disk1 /home/ftp/disk1 none bind
/mnt/sg60/disk2 /home/ftp/disk2 none bind
/home/chrillo/upload /home/levi/upload none bind
/home/chrillo/upload /home/madmartigan/upload none bind
/home/chrillo/upload /home/cube/upload none bind
/home/ftp /home/levi/pub none bind
/home/ftp /home/madmartigan/pub none bind
# NTFS mounts
# <fs> <mountpoint> <type> <opts> <dump/pass>
#/dev/hdc1 /home/chrillo/mounts/vault2 ntfs owner,uid=chrillo,gid=users,async,ro,umask=0 0 0
# glibc 2.2 and above expects tmpfs to be mounted at /dev/shm for
# POSIX shared memory (shm_open, shm_unlink). Adding the following
# line to /etc/fstab should take care of this:
# (tmpfs is a dynamically expandable/shrinkable ramdisk, and will use almost no
# memory if not populated with files)
tmpfs /dev/shm tmpfs defaults 0 0
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/dev/hda3 on / type ext3 (rw,noatime)
proc on /proc type proc (rw)
none on /dev type devfs (rw)
tmpfs on /mnt/.init.d type tmpfs (rw,mode=0644,size=2048k)
/dev/hda4 on /home type ext3 (rw,noatime)
tmpfs on /dev/shm type tmpfs (rw)
//zax/pub4 on /home/ftp/disk3 type smbfs (0)
/home/chrillo/upload on /home/levi/upload type none (rw,bind)
/home/chrillo/upload on /home/madmartigan/upload type none (rw,bind)
/home/chrillo/upload on /home/cube/upload type none (rw,bind)
/mnt/sg60/disk2 on /home/ftp/disk2 type none (rw,bind)
/dev/hdb1 on /mnt/sg20 type ext3 (rw,noatime)
/dev/hdc1 on /mnt/sg60 type ext3 (rw,noatime)
/mnt/sg20/disk1 on /home/ftp/disk1 type none (rw,bind)
/mnt/sg60/disk2 on /home/ftp/disk2 type none (rw,bind)
/home/ftp on /home/levi/pub type none (rw,bind)
/home/ftp on /home/madmartigan/pub type none (rw,bind)
/home/ftp on /home/cube/pub type none (rw,bind)
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As you can see from the fstab, some directories get mounted within another mounted directory. When you enter for example /home/levi/pub/disk1, you're supposed to se the contents of of that directory. According to mtab /home/sg20/disk1 is mounted on /home/ftp/disk1. And /home/ftp/ is mounted on /home/levi/pub. Damn, I'm getting a headache from this. I don't think it is possible to mount like this, or is it?
I don't even know if you get the principles of it. I've must've missed something.
Edit: Oh damn... forgot to show you the problem itself. 
Here's how it looks when you enter /home/ftp/disk1
| Code: |
server root # cd /home/ftp/disk1/
server disk1 # ls
films
server disk1 #
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and here's how it looks when you enter /home/levi/pub/disk1 (wich should point to the same dir)
| Code: |
server root # cd /home/levi/pub/disk1/
server disk1 # ls
server disk1 #
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It's empty! My first thought was that you can't mount dirs inside other dirs that already have been mounted themselves. Or can you...?
PS.
I can't use symlinks instead of mounting, since those won't work inside a chrooted environment on the FTP. Reference found here.
Please help me with this! 
Last edited by frippz on Sun Apr 27, 2003 3:27 pm; edited 1 time in total |
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handsomepete
Guru
Joined: 21 Apr 2002
Posts: 548
Location: Kansas City, MO
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| Posted: Sun Apr 27, 2003 3:18 pm Post subject: |
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| What are you trying to do? If you're just wanting to make /home/ftp reference /home/levi/pub (or /mnt/sg20/disk1 reference /home/ftp/disk1), why not just use symlinks? That's what they're for, and you don't have to worry about what gets mounted when and in what order. |
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frippz
Guru
Joined: 22 Aug 2002
Posts: 460
Location: Sweden
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| Posted: Sun Apr 27, 2003 3:27 pm Post subject: |
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Updated my post with info regarding symlinks. Check the bottom...  |
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hielvc
Advocate
Joined: 19 Apr 2002
Posts: 2805
Location: Oceanside, Ca
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| Posted: Mon Apr 28, 2003 12:12 am Post subject: |
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Read read this form man mount:
Since Linux 2.4.0 it is possible to remount part of the file hierarchy
somewhere else. The call is
mount --bind olddir newdir
After this call the same contents is accessible in two places.
This call attaches only (part of) a single filesystem, not possible
submounts. The entire file hierarchy including submounts is attached a
second place using
mount --rbind olddir newdir
You might try "rbind" to mount the entire tree and submounts.
You could also try changing the order of your mounts to | Code: |
/mnt/ftp /home/levi/pub
/mnt/sg20/disk1 /home/ftp/disk1 |
Interesting though, it made me feel like my brain pan was going to fall out my trap door. 
hielvc |
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frippz
Guru
Joined: 22 Aug 2002
Posts: 460
Location: Sweden
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| Posted: Mon Apr 28, 2003 2:42 pm Post subject: |
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Man! How did I miss that one! 
Gonne give it a try ASAP. But you're right. The mere thought of this makes my head hurt... 
I've heard that virtual chrooting solves the symlink problem. But is it implemented i ProFTPd? I'd love to use symlinks instead of mounting dirs all over the system. |
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