Date: Mon, 16 Apr 2001 08:31:00 +0200 (CEST) From: Luigi Rizzo <luigi@info.iet.unipi.it> To: net@freebsd.org Subject: diskless stuff Message-ID: <200104160631.IAA14921@info.iet.unipi.it>
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Hi,
i just gave a shot at diskless support in RELENG_4, and I am
attaching some code to help setting things.
The first one (a shell script called clone_root) helps you
create a shared readonly root partition for the diskless clients.
The second piece of code is a set of patches for /etc/rc and
/etc/rc.diskless2, which do the following:
/etc/rc
Diskless needs a slightly different sequence of
mounts. There used to be a variable, early_nfs_mounts,
which controlled this, but it got nuked in 1.209
with no corresponding reinsertion in /etc/rc.diskless2.
This patch fixes this.
/etc/diskless2
Mount filesystems in the order needed to make things
work.
Also comment out the mount_null of /var/tmp on /tmp,
and assume that /tmp is symlinked to /var/tmp on the
root partition. For some reason the mount_null
causes a panic here and this workaround seems to work
anyways.
Any takers to test&commit this to -current ? The clone_root
script could go into /usr/share/examples/diskless
cheers
luigi
------------- cut here ---- file: clone_root -----------------
#!/bin/sh
#
# (C) 2001 Luigi Rizzo, Gabriele Cecchetti
# <Standard BSD copyright>
# Revised 2001.04.16
# clone root filesystem for diskless root stuff
#
# usage
# clone_root all to do a full copy (e.g. bin, sbin...)
# clone_root update to recreate /var (including devices)
# clone_root to copy /conf and password-related files
#
# This script assumes that you use a shared readonly root and /usr
# partition. The script creates a partial clone of the root partition,
# and puts it into ${DEST} (defaults to /diskless_root ) on the server,
# where it is read.
#
# To run a diskless install you need to do the following:
#
# create /conf/default/etc/fstab
# this will replace the standard /etc/fstab and should contain
# as a minimum the following lines
# ${SERVER}:${DEST} / nfs ro 0 0
# ${SERVER}:/usr /usr nfs ro 0 0
# proc /proc procfs rw 0 0
#
# create /conf/default/etc/rc.conf
# this will replace the standard rc.conf and should contain
# the startup options for the diskless client. Most likely
# you will not need to set hostname and ifconfig_* because these
# will be already set by the startup code. You will also
# probably need to set local_startup="" so that the server's
# local startup files will not be used.
#
# create a kernel config file in /sys/i386/conf/DISKLESS with
# options MFS
# options BOOTP
# options BOOTP_NFSROOT
# options BOOTP_COMPAT
# and do a full build of the kernel.
# If you use the firewall, remember to default to open or your kernel
# will not be able to send/receive the bootp packets.
#
# On the server:
# enable NFS server and set /etc/exports as
# ${DEST} -maproot=0 -alldirs <list of diskless clients>
# /usr -alldirs
#
# enable bootpd by uncommenting the bootps line in /etc/inetd.conf
# and putting at least the following entries in /etc/bootptab:
# .default:\
# hn:ht=1:vm=rfc1048:\
# :sm=255.255.255.0:\
# :sa=${SERVER}:\
# :gw=${GATEWAY}:\
# :rp="${SERVER}:${DEST}":
#
# client1:ha=0123456789ab:tc=.default
#
# and make sure that client1 is listed in /etc/hosts
# VARIABLES:
# some manual init is needed here.
# DEST the diskless_root dir (goes into /etc/bootptab and /etc/exports
# on the server)
# DEVICES device entries to create in /dev
DEST=/diskless_root
DEVICES="all snd1 bktr0"
# you should not touch these vars:
# SYSDIRS system directories and mountpoints
# DIRS mountpoints (empty dirs)
# PWFILES files related to passwords
# TOCOPY files and dirs to copy from root partition
SYSDIRS="dev proc root usr var var/db"
DIRS="c cdrom home home2 mnt mnt1 sd1 sd1/usr wd0e wd2 wd2/usr"
PWFILES="master.passwd passwd spwd.db pwd.db"
TOCOPY="bin boot compat etc modules sbin stand sys"
init_diskless_root() {
echo "Cleaning old diskless root ($DEST)"
cd /
rm -rf ${DEST} && echo "Old diskless root removed."
echo "Creating $DEST..."
mkdir -p $DEST && echo "New diskless root created."
echo "+++ Now copy original tree from / ..."
ex=""
(cd / ; tar -clf - ${TOCOPY} ) | (cd $DEST; tar xvf - )
#(cd / ; find -x dev | cpio -o -H newc ) | \
# (cd $DEST; cpio -i -H newc -d )
echo "+++ Fixing permissions on some objects"
chmod 555 $DEST/sbin/init
}
update_conf_and_pw() {
echo "+++ Copying files in /conf and password files"
(cd ${DEST} ; rm -rf conf )
(cd / ; tar clf - conf ) | (cd ${DEST}; tar xvf - )
mkdir -p ${DEST}/conf/etc # used to mount things
(cd /etc ; tar cvf - ${PWFILES} ) | (cd ${DEST}/etc ; tar xf - )
}
update() {
echo "+++ update: create mountpoints and device entries, kernel"
for i in ${SYSDIRS} ${DIRS}
do
rm -r -f ${DEST}/$i
mkdir -p ${DEST}/$i && chown root:wheel ${DEST}/$i && echo -n "$i "
done
echo "."
ln -s /var/tmp ${DEST}/tmp
echo "+++ Now use MAKEDEV to create devices ${DEVICES}"
(cd $DEST/dev ; cp /dev/MAKEDEV . )
(cd $DEST/dev ; /dev/MAKEDEV ${DEVICES} )
(cd $DEST/dev ; ln -s /dev/sysmouse mouse )
echo "+++ Copying kernel from /sys/compile/DISKLESS"
cp /sys/compile/DISKLESS/kernel $DEST/kernel
echo "."
}
# Main entry point
case $1 in
all) # clean and reinstall the whole diskless_root
init_diskless_root
update
update_conf_and_pw
;;
update) # clean and rebuild mountpoints and device entries
update
update_conf_and_pw
;;
*) # copy /conf and password files
update_conf_and_pw
;;
esac
exit 0
### end of file ###
------------- cut here --- end of clone_root ---------------
------------- cut here --- patches for /etc/rc and /etc/rc.diskless2 ----
--- src/etc/rc Sat Apr 14 04:32:22 2001
+++ /etc/rc Mon Apr 16 06:48:27 2001
@@ -187,24 +140,24 @@
umount -a >/dev/null 2>&1
+# Run custom disk mounting function here
+#
+if [ -n "${diskless_mount}" -a -r "${diskless_mount}" ]; then
+ sh ${diskless_mount}
+else
# Mount everything except nfs filesystems.
mount -a -t nonfs
+fi
case $? in
0)
;;
*)
echo 'Mounting /etc/fstab filesystems failed, startup aborted'
exit 1
;;
esac
-# Run custom disk mounting function here
-#
-if [ -n "${diskless_mount}" -a -r "${diskless_mount}" ]; then
- sh ${diskless_mount}
-fi
-
adjkerntz -i
purgedir() {
--- src/etc/rc.diskless2 Tue Mar 6 03:15:04 2001
+++ /etc/rc.diskless2 Mon Apr 16 07:12:25 2001
@@ -38,28 +38,34 @@
. /etc/rc.conf
fi
+echo "+++ mfs_mount of /var"
mount_mfs -s ${varsize:=65536} -T qp120at dummy /var
var_dirs="run dev db msgs tmp spool spool/mqueue spool/lpd spool/output \
spool/output/lpd"
+echo "+++ create dirs in /var"
for i in ${var_dirs}
do
mkdir /var/${i}
done
-chmod 755 /var/run
-chmod 755 /var/db
-chmod 755 /var/spool
+chmod 755 /var/run /var/db /var/spool
chmod 1777 /var/tmp
+
+mount -a # chown and chgrp are in /usr
+
chown -R root.daemon /var/spool/output
chgrp daemon /var/spool/lpd
#
# XXX make sure to create one dir for each printer as requested by lpd
#
-if [ ! -h /tmp -a ! -h /var/tmp ]; then
- mount_null /var/tmp /tmp
-fi
+# We assume that /tmp is symlinked to /var/tmp on the shared root
+# echo "+++ mount_null of /var/tmp"
+# if [ ! -h /tmp -a ! -h /var/tmp ]; then
+# mount_null /var/tmp /tmp
+# fi
# extract a list of device entries, then copy them to a writable partition
(cd /; find -x dev | cpio -o -H newc) > /tmp/dev.tmp
+echo "+++ mount_mfs of /dev"
mount_mfs -s 4096 -i 512 -T qp120at dummy /dev
(cd /; cpio -i -H newc -d < /tmp/dev.tmp)
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