On Wed, 14 Mar 2007, Sascha Frey wrote:
> auto.master:
> /homes /etc/auto.homes
>
> auto.homes:
> * -fstype=nfs,rw homeserver1:/home/&
> * -fstype=nfs,rw homeserver2:/home/&
>
> The directories on the first server are mounted.
> But if I try to access a home which is on the second one I get a 'No
> such file or directory' error.
That's not a bug, that's a feature :-) If you were to access /homes/jimc
then autofs would go through /etc/auto.homes until it found a match to the
wildcard (in the first line), mount homeserver1:/home/jimc, and its job is
done; it has no reason to look at subsequent lines.
Several people have suggested using hot failover syntax, so if the mount
fails it could try additional servers (on the same line). But that's a
kludge, not what hot failover is for -- it's intended for when several
servers have identical data, so (e.g.) the department's favorite software
package remains available even if its primary residence site goes down.
Here at UCLA-Mathnet we handle the issue actually in two parallel ways:
first, a user's official homedir would be /net/$hostname/$filesys/$loginID,
e.g. /net/julia/h1/jimc, and a generic map causes julia:/h1 to be mounted
on /net/julia/h1. This has the advantage of requiring one mount per
filesystem, not one mount per user, so we've never hit the limit on the
number of mounted filesystems.
On the other hand, the "home" NIS map would have a key of the loginID and a
value of for example julia:/h1/jimc, and the automounter would mount the
correct subdirectory of the correct host on /home/jimc (at a cost of one
mount per user). We provide this for autonomous scripts where $HOME may
not have a useable value and where it may be hard to resolve ~$USER, e.g.
/bin/sh scripts on Solaris.
Conclusion: one way or another, you need to list the server and the
filesystem explicitly in the NIS or LDAP map that defines the user's home
directory.
FYI, here are our /etc/auto.* files:
auto.master:
/net /etc/auto.net.new
/home yp:auto.home
auto.net.new (all on 1 line):
* -rsize=8192,wsize=8192,retry=1,soft,fstype=autofs,-DSERVER=& \
file:/etc/auto.net.generic
auto.net.generic:
* ${SERVER}:/&
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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