Date: Fri, 30 Mar 2001 09:00:04 -0800 (PST) From: Falco Krepel <krepel@fokus.gmd.de> To: freebsd-bugs@FreeBSD.org Subject: Re: conf/25730: [PATCH] mount_mfs is being phased out -> new diskless boot procedure Message-ID: <200103301700.f2UH04d57209@freefall.freebsd.org>
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The following reply was made to PR conf/25730; it has been noted by GNATS.
From: Falco Krepel <krepel@fokus.gmd.de>
To: freebsd-gnats-submit@FreeBSD.org, krepel@fokus.gmd.de
Cc:
Subject: Re: conf/25730: [PATCH] mount_mfs is being phased out -> new diskless
boot procedure
Date: Fri, 30 Mar 2001 18:53:31 +0200
This is a multi-part message in MIME format.
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I have implemented some good ideas from Mike Smith in my
rc.diskless{1,2} files and make some other changes:
1. Now I use the kernel flag "vm.nswapdev" to determine if swap is
available.
2. To determine if DEVFS are used I check the kernel flag
"vfs.devfs.generation" as it done within the /etc/rc file.
3. I write "chk_err" and "mkmd" functions also in rc.diskless2 because
the rc.diskless2 file is executed in the rc file: "sh rc.diskless2"
When you change this call to ". rc.diskless2" than the mkmd function
from rc.diskless2 could replace the mkmd function in rc.diskless1. The
chk_err funcktion in rc.diskless2 could be deleted.
The following knobs must be added in the /etc/defaults/rc.conf:
diskless_var_size="32m"
diskless_tmp_enable="NO"
diskless_tmp_size="32m"
diskless_dev_size="2m"
Maybe other values are more useful.
--
Falco Krepel Phone: +49-(0)30 - 34 63 - 7 276
GMD-FOKUS Fax: +49-(0)30 - 34 63 - 8 276
Kaiserin-Augusta-Allee 31 e-mail: krepel@fokus.gmd.de
10589 Berlin WWW: http://www.fokus.gmd.de/usr/krepel
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# Copyright (c) 1999 Matt Dillion
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#
# $FreeBSD: src/etc/rc.diskless1,v 1.6 2000/10/08 19:18:24 obrien Exp $
#
#
# /etc/rc.diskless1 - general BOOTP startup
#
# BOOTP has mounted / for us. Assume a read-only mount. We must then
# - figure out our IP by querying the interface
# - fill /conf/etc (writable) with files from /etc, and then update
# per-machine files from /conf/*/ where * is the IP of the host,
# the IP of the subnet, "default", or nothing.
# - mount /conf/etc over /etc so we can see the new files.
#
# WARNING: i thing you should not change /etc/rc or strange things could
# happen.
#
# The operator is in charge of setting /conf/*/etc/* things as appropriate.
# Typically rc.conf and fstab need to be changed, but possibly
# also other files such as inetd.conf etc.
# chkerr:
#
# Routine to check for error
#
# checks error code and drops into shell on failure.
# if shell exits, terminates script as well as /etc/rc.
#
chkerr() {
case $1 in
0)
;;
*)
echo "$2 failed: dropping into /bin/sh"
/bin/sh
# RESUME
;;
esac
}
# mkmd:
#
# Builds an md(4) disk of the size in $1
# Labels and newfs' it.
# Mounts it on the destination in $2
# Returns the name of the created md device in md_device
# Returns the name of the device containing the filesystem in md_filesystem
mkmd() {
md_device=`mdconfig -a -t malloc -s $1`
chkerr $? "configuring md device"
disklabel -rw $md_device auto
chkerr $? "labelling md device"
md_filesystem=/dev/$md_device"c"
newfs $md_filesystem 2>&1 >/dev/null
chkerr $? "making md device filesystem"
mount $md_filesystem $2
chkerr $? "mounting md filesystem on $2"
}
# DEBUGGING
#
# set -v
# Figure out our interface and IP.
#
bootp_ifc=""
bootp_ipa=""
bootp_ipbca=""
iflist=`ifconfig -l`
for i in ${iflist} ; do
set `ifconfig ${i}`
while [ $# -ge 1 ] ; do
if [ "${bootp_ifc}" = "" -a "$1" = "inet" ] ; then
bootp_ifc=${i} ; bootp_ipa=${2} ; shift
fi
if [ "${bootp_ipbca}" = "" -a "$1" = "broadcast" ] ; then
bootp_ipbca=$2; shift
fi
shift
done
if [ "${bootp_ifc}" != "" ] ; then
break
fi
done
echo "Interface ${bootp_ifc} IP-Address ${bootp_ipa} Broadcast ${bootp_ipbca}"
# Files in /etc are copied to /conf/etc which is writable. Then
# per-machine configs from /conf/ip.address/etc are copied onto this
# directory. First choice is using the client's IP, then the client's
# broadcast address, then a default configuration.
# This way we have some flexibility to handle clusters of machines
# on separate subnets.
#
# up to now we don't have make swapon and so we must use malloc
#
mkmd 2m /mnt
cp -Rp /etc/* /mnt
chkerr $? "copy /etc template"
if [ -d /conf/${bootp_ipa} ] ; then
cp -Rp /conf/${bootp_ipa}/etc/* /mnt
elif [ -d /conf/${bootp_ipbca} ] ; then
cp -Rp /conf/${bootp_ipbca}/etc/* /mnt
else
cp -Rp /conf/default/etc/* /mnt
fi
# Make the new directory available as /etc
#
umount /mnt
mount $md_filesystem /etc
# Tell /etc/rc to run the specified script after
# it does its mounts but before it does anything
# else.
#
# This script is responsible for setting up the
# diskless mount environment. This can be
# overriden by /conf/ME/rc.conf.local if, for
# example, you do not want to run the standard
# system /etc/rc.diskless2
diskless_mount="/etc/rc.diskless2"
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filename="rc.diskless2"
# Copyright (c) 1999 Matt Dillon
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#
# $FreeBSD: src/etc/rc.diskless2,v 1.7 2000/10/08 19:18:24 obrien Exp $
#
#
# rc.diskless2
#
# If there is a global system configuration file, suck it in.
#
if [ -r /etc/defaults/rc.conf ]; then
. /etc/defaults/rc.conf
source_rc_confs
elif [ -r /etc/rc.conf ]; then
. /etc/rc.conf
fi
# chkerr:
#
# Routine to check for error
#
# checks error code and drops into shell on failure.
# if shell exits, terminates script as well as /etc/rc.
#
chkerr() {
case $1 in
0)
;;
*)
echo "$2 failed: dropping into /bin/sh"
/bin/sh
# RESUME
;;
esac
}
# mkmd:
#
# Builds an md(4) disk with malloc or swap depending on
# the diskless client use swap with the size in $1
# Labels and newfs' it.
# Mounts it on the destination in $2
# Returns the name of the created md device in md_device
# Returns the name of the device containing the filesystem in md_filesystem
#
mkmd() {
dlv=`/sbin/sysctl -n vm.nswapdev 2> /dev/null`
if [ ${dlv:=0} != 0 ]; then
md_device=`mdconfig -a -t swap -s $1`
else
md_device=`mdconfig -a -t malloc -s $1`
fi
chkerr $? "configuring md device"
disklabel -rw $md_device auto
chkerr $? "labelling md device"
md_filesystem=/dev/$md_device"c"
newfs $md_filesystem 2>&1 >/dev/null
chkerr $? "making md device filesystem"
mount $md_filesystem $2
chkerr $? "mounting md filesystem on $2"
}
# reconstruct /var
#
mkmd ${diskless_var_size} /var
mtree -p /var -eU -f /etc/mtree/BSD.var.dist 2>&1 >/dev/null
touch /var/log/cron
touch /var/log/lpd-errs
touch /var/log/maillog
touch /var/log/messages
touch /var/log/ppp.log
touch /var/log/security
touch /var/log/slip.log
# Copy the templated /dev into a locally-writable version
# if wo are not using DEVFS
#
if [ ! sysctl vfs.devfs.generation > /dev/null 2>&1 ]; then
mkmd ${diskless_dev_size} /mnt
cp -Rp /dev/* /mnt
umount /mnt
mount $md_filesystem /dev
fi
# Build a small /tmp
#
case ${diskless_tmp_enable} in
[Yy][Ee][Ss])
mkmd ${diskless_tmp_size} /tmp
;;
*)
if [ ! -h /tmp -a ! -h /var/tmp ]; then
mount_null /var/tmp /tmp
fi
;;
esac
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