On Mon, 9 Jun 2008, Jan Iven wrote:

> On 06/06/08 19:03, Ken Teh wrote:
> [..]
>>  %post
>>  ...
>>  [ -d /mnt/SL ] || mkdir -p /mnt/SL
>>  mount -rvt nfs server.anl.gov:/SL /mnt/SL
>>  if [ $? = 0 ]; then
>>    echo "server.anl.gov:/SL mounted"
>>  else
>>    echo "failed to mount server.anl.gov:/SL
>>    exit 0
>>  fi
>
> The error message from mount, as well as the saved syslog file might have 
> some clues, but perhaps you haven't installed portmap (or haven't started 
> it)? You will also need nfs-utils, and I've seen recommendations to use the 
> "-o nolock" mount option in %post.
>
> If this all still fails, I'd suggest to break out into a shell in the "fail" 
> tree of your %post, to allow you to do some debugging. Something like
>
> chvt 6
> /bin/bash -i </dev/tty6 >&/dev/tty6

Well vt 6 is where the installer X server seems to run but yes.  I'm 
afraid I copy openvt onto the box during %pre so things in %post (etc) can 
use it - it is a cleaner tool.  (note that the sl5 busybox includes an 
'openvt' but that doesn't have the useful options).

In the %post remember that the startup scripts havn't been run so files 
like resolv.conf may not have sane contents.

We use "%post --nochroot" so we can first copy bits of state (stuff we 
saved from any previous install, the ks files and logs from the install) 
into the newly installed tree, and then mount a directory from which we 
run various scripts in the chrooted tree:

...
# location of new root
NR=/mnt/sysimage
...
## Get dns lookups working enough to do the first mount (sigh...)
cat > $NR/etc/resolv.conf <<EOF
..... <put your contents here> .....
EOF

## Fix up nsswitch.conf so host name lookups use DNS not try to use NIS
cp $NR/etc/nsswitch.conf $NR/etc/nsswitch.conf.SL_orig
printf "/^hosts:/\ns;:.*;: files dns;\nw\nq\n" | ed $NR/etc/nsswitch.conf

# Since we want to do NFS we need to start portmap and nfslocking (in
# case it is needed), but portmapper needs loopback starting up first!
#
/usr/bin/ifconfig lo 127.0.0.1 up
#
chroot $NR /etc/rc.d/init.d/portmap start
chroot $NR /etc/rc.d/init.d/nfslock start

# Name lookups etc should be ok by now
chroot $NR mount -o ro,nolock $SERV $CFDIR

... code to run the scripts in the chroot environment ...

chroot $NR /etc/rc.d/init.d/nfslock stop
chroot $NR /etc/rc.d/init.d/portmap stop

cd /
chroot $NR umount $CFDIR



-- 
Jon Peatfield,  Computer Officer,  DAMTP,  University of Cambridge
Mail:  [log in to unmask]     Web:  http://www.damtp.cam.ac.uk/