On Wed, 20 Apr 2005 [EMAIL PROTECTED] wrote:
On Mon, 18 Apr 2005, Lucas Peet wrote:
Hello,
Does autofs / automount have the ability to bind one directory to another like 'mount -o bind dir1 dir2'? And if so, can this be handled by using wildcards in the maps? Here is my situation:
I have a large directory of user's home directories. These are in a chroot
jail, so making soft links isn't an option, and hard links won't work for
directories. I need to bind (mount) a directory that lives outside the
chroot jail to a directory / mount point inside each home directory. The
users will only be accessing this directory for short periods (to copy a
file or two), and I think it would be more practical to have autofs mount it
whenever they needed access to it, and unmount it when they're done.
I'm not sure on the exact number of mounted filesystems Linux can handle (or
if a directory mounded via -o bind counts towards that, though I'd assume it
would), but I would think that using automount instead of putting hundreds
of entries into fstab would be more the Linux way of doing things. Even if
I had to put an entry for each user in a map, that would be a better
solution to me than using fstab, since they all wouldn't be mounted at the
same time, all the time.
Dir to be accessed by all users: /home/stuff/everyone
Mounted to: /home/users/*/everyone
What would be the map key in this case?
Perhaps you could do something like ...
auto.master:
/home /etc/autofs.home
autofs.home:
* / :/home/users/& :/home/stuff/&/everyone
You might also need a -bind for this.
* -bind :/home/users/& :/home/stuff/&/everyone
Alternately:
* / localhost:/home/users/& localhost:/home/stuff/&/everyone
might work.
I haven't tried this so I'm not sure it will work.
Give it a try. It will be interesting to see how chroot affects this as that will probably affect the path that autofs gets back at mount request time.
Note that it can't work with anything less than 4.1.4 for the : escape to work in multi-maps.
And another thing.
This would mount two directories at a time. When the mount times out both would be umounted.
Ian
_______________________________________________ autofs mailing list autofs@linux.kernel.org http://linux.kernel.org/mailman/listinfo/autofs
