Date: Mon, 13 Feb 1995 13:15:40 -0800 (PST) From: julian@tfs.com (Julian Elischer) To: jkh@FreeBSD.org (Jordan K. Hubbard) Cc: hackers@FreeBSD.org Subject: Re: any amd users out there? Message-ID: <m0re87Q-0003wNC@TFS.COM> In-Reply-To: <199502131436.GAA15124@time.cdrom.com> from "Jordan K. Hubbard" at Feb 13, 95 06:36:44 am
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>
> Can to send me your maps? I've read the docs and I'm still
> confused! :-)
>
> Basically, I just want to map machines into a /machine/path
> scheme. /thud/d, /freefall/a, etc.
>
> Thanks!
>
> Jordan
>
to start it off, add in /etc/rc
something of the form.....
#----------------------------
PATH=/sbin:/usr/sbin:/usr/bin
export PATH
#LOGFILE=syslog
LOGFILE=/var/adm/syslog/amd.log
MAP_1="/net /etc/a_net"
MAP_2=""
MAP_3=""
MAP_4=""
TMOUT="-w 300"
case "$LOGFILE" in
*/*)
if [ -f "$LOGFILE" ]; then
mv "$LOGFILE" "$LOGFILE"-
fi
> "$LOGFILE"
;;
syslog)
:
;;
esac
if [ -x /usr/sbin/amd -a -r /etc/a_net ]; then
if (/usr/sbin/amd -p -r -a /tmp_mnt -l $LOGFILE $TMOUT $MAP_1 $MAP_2 $MAP_3 $MAP_4) > /var/run/amd.pid ; then
echo "NFS auto-mount service started"
else
echo "Unable to provide NFS auto-mount service"
fi
fi
#-----------------------
and in /etc/a_net, put:
#--------------------
/defaults type:=host;fs=${autodir}/${rhost}/root;rhost:=${key}
* opts:=rw,nosuid,grpid
#--------------------
what this does is mounts amd on /net, with a map described in /etc/a_net.
whenever you do a lookup() operation on /net, amd (pretending to be an NFS
server) gets the make being looked for, and uses the algorythm described
in a_net to decide what to do with that name..
it will return as though it found a symbolic link, pointing to
wherever it decided you should look. If the system you want to look at
hasn't previously been mounted, it will quickly mount it's
exported filesystems in /tmp_mnt, and return the appropriate symbolic link,
so that further name lookup (and eventually open()) operations occur
over there, on the appropriate filesystem.
to read the a_net file..
read it as:
/defaults type:=host;fs=${autodir}/${rhost}/root;rhost:=${key}
"for all operations the following operations and flags apply...."
notice that the variable ${key}, and ${rhost} will be evaluated at
the time of the lookup request, not at initialisation time.
* opts:=rw,nosuid,grpid
"for any name being looked up that matches '*' (that's all of them folks),
apply the following flags, (and of course the defaults defined above)"
in the case above ${autodir} is set to /tmp_mnt
thus /net/freefall/usr would be mapped to:
/tmp_mnt/freefall/root/usr
which will have been mounted for you bby amd, as soon as it realised that
you were going to need it..
I don't think the 'root' field is needed in a_net, but it was in the
example given in the docs so I left it.
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