On Thu, 13 Apr 2006, Guillaume Rousse wrote:
> However, it seems automount is still taking priority on direct access if
> a mount point is activated.
>
> If my /etc/fstab says:
> /dev/hda1 /home
>
> and /etc/init.d/autofs status says:
> /usr/sbin/automount /home/graves ldap
> ou=auto.home.graves,ou=autofs,dc=village,dc=inria,dc=fr
>
> Any attempt to access /home/graves on graves host will mount it through
> autofs, and access it through NFS, masking local filesystem and probably
> wasting resources.
I'm not 100% sure of your configuration; however, my experience is that if
I use autofs to access a filesystem on the same host, it will do a bind
mount rather than a NFS mount, and the bind mount has (I think) totally
zero cost once made.
As an example, here's what we do:
On host1, the homedir of userA is /h3/userA (not really capitalized).
On host2, the homedir of userB is /h4/userB.
On both hosts we do: automount /net file /etc/auto.net
/etc/auto.net says:
* -other,options,fstype=autofs,-DSERVER=& file:/etc/auto.net.generic
/etc/auto.net.generic says:
* ${SERVER}:/&
In other words, if you refer to /net/$anyhost/$anything, the leader process
will spawn a submount process specific to $anyhost which will attempt to
mount /$anything off of $anyhost. ($anyhost only delivers directories
(filesystems) in /etc/exports, and off-site traffic is blocked at the
firewall, but the mount will be attempted even so.)
The password map says that the homedir of userA is /net/host1/h3/userA,
and ~userB is /net/host2/h4/userB.
Executing on host1, you use /net/host2/h4/userB and the automount process
does "mount -t nfs host2:/h4 /net/host2/h4". On the other hand, if you
refer to /net/host1/h3/userA it is smart enough to do "mount --bind /h3
/net/host1/h3", and /proc/mounts says:
/dev/sdb4 /h3 ext3 rw 0 0
/dev/sdb4 /net/sunset/h3 ext3 rw 0 0
We have the actual filesystems (here, /h3) separated from the automounted
path names (here, /net/host1/h3). If we tried to have both "real"
directories and automount points in the same containing directory, I doubt
it would work; at best it would be a can of worms.
James F. Carter Voice 310 825 2897 FAX 310 206 6673
UCLA-Mathnet; 6115 MSA; 405 Hilgard Ave.; Los Angeles, CA, USA 90095-1555
Email: [EMAIL PROTECTED] http://www.math.ucla.edu/~jimc (q.v. for PGP key)
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