Date: Mon, 25 Jan 1999 01:02:36 -0800 (PST) From: Matthew Dillon <dillon@apollo.backplane.com> To: Luigi Rizzo <luigi@labinfo.iet.unipi.it> Cc: current@FreeBSD.ORG Subject: Re: beginnings of a diskless boot sequence being committed Message-ID: <199901250902.BAA02600@apollo.backplane.com> References: <199901250533.GAA25782@labinfo.iet.unipi.it>
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:> :> Basically this consists of a bit of code in /etc/rc and, later tonight, :> an /etc/rc.diskless script ( a new script ). : :before you reinvent the wheel, have you looked at my code in :http://www.iet.unipi.it/~luigi/diskless981113/ : :this is sliglthly pout of date wrt what i have now (an rc.diskless :file, which essentially contains all rc modifications that you see in :the above web page) : : cheers : luigi :-----------------------------------+------------------------------------- : Luigi RIZZO . I was basically just cleaning up stuff I've been using for several months. Your stuff looks quite similar. What I propose is that a new kernel sysctl variable be added called 'kern.conf_dir' which the kernel initially sets to nothing. We modify /etc/rc to detect a diskless boot ( trivial ) ... the rc.diskless code must run before just about anything else since the filesystems are all NFS read-only mounts ( and we want to be able to leave them that way ). rc.diskless figures out the IP address BOOTP assigned us and changes kern.conf_dir to point to /conf/$IP. /etc/rc.conf is then made 'smart' about where to look for rc.conf.local and /etc/rc is also made smart about where to look for rc.local. Specifically, if someone has set kern.conf_dir, *that* is where they look. Here is the proposed change to /etc/rc.conf ( the tail end of it ). Rather then look for and source /etc/rc.conf.local, it uses kern.conf_dir. ############################################################## ### Allow local configuration override at the very end here ## ############################################################## # # If the kernel configuration script MIB exists, use it. sysctl -n kern.conf_dir > /dev/null 2>&1 if [ $? = 0 ]; then conf_dir=`sysctl -n kern.conf_dir` fi if [ "X$conf_dir" = "X" ]; then conf_dir=/etc fi if [ -f $conf_dir/rc.conf.local ]; then . $conf_dir/rc.conf.local fi -------- /etc/rc must be modified to do something similar when it is ready to run /etc/rc.local -- it would use ${kern.conf_dir}/rc.local instead. The only non-standard item is that /etc/rc needs to bypass the standard disk configuraton code on a diskless boot, because the fstab is the server's, not the diskless workstation's. My proposal pretty much keeps intact the rc / rc.conf mechanism and simply 'moves' where rc and rc.conf look for rc.local and rc.conf.local, plus a little additional magic to allow it to hook all the MFS filesystems into the system. Of course, then there are all the files in /conf/IPADDRESS/... actually not too many, but these require a little more customization depending on how you like to setup your server. I haven't committed the whole thing yet, I would like to get feedback on the general idea before I do so. But it is ready to go now. #!/bin/sh # $Id: rc,v 1.170 1999/01/25 04:40:53 dillon Exp $ # From: @(#)rc 5.27 (Berkeley) 6/5/91 #... stty status '^T' # Set shell to ignore SIGINT (2), but not children; # shell catches SIGQUIT (3) and returns to single user after fsck. trap : 2 trap : 3 # shouldn't be needed HOME=/; export HOME PATH=/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/sbin export PATH # BOOTP diskless boot. We have to run the rc file early in order to # handle read-only NFS mounts, where the various config files # in /etc often don't apply. rc.diskless may terminate the rc script # early or it may fall through, depending on the case. # if [ -f /etc/rc.diskless ]; then if [ `/sbin/sysctl -n vfs.nfs.diskless_valid` != 0 ]; then . /etc/rc.diskless fi fi # Configure ccd devices. if [ "X$skip_diskconf" != "XYES" -a -f /etc/ccd.conf ]; then ccdconfig -C fi ... if [ "X$skip_diskconf" != "XYES" ]; then swapon -a fi if [ "X$skip_diskconf" != "XYES" -a $1x = autobootx ]; then ... else echo Skipping disk checks ... fi ( a couple of more minor skip_diskconf checks ) .... # Run custom disk mounting function ( typically setup by rc.diskless ) # if [ "X$diskless_mount_func" != "X" ]; then $diskless_mount_func fi ... normal rc continues ... # Do traditional rc.local file if it exists. # if [ -f $conf_dir/rc.local ]; then echo -n 'starting local daemons:' sh $conf_dir/rc.local echo '.' fi -------- To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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