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From: Doug Ambrisko <ambrisko@whistle.com>
Message-Id: <200011042037.MAA63521@whistle.com>
Subject: Re: dhcp boot was: Re: diskless workstation
In-Reply-To: <200011041948.eA4Jm0R70463@zibbi.icomtek.csir.co.za> from John Hay
 at "Nov 4, 2000 09:47:59 pm"
To: John Hay <jhay@icomtek.csir.co.za>
Date: Sat, 4 Nov 2000 12:37:16 -0800 (PST)
Cc: Doug Ambrisko <ambrisko@whistle.com>,
	Mike Smith <msmith@FreeBSD.ORG>, Danny Braniss <danny@cs.huji.ac.il>,
	freebsd-hackers@FreeBSD.ORG
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John Hay writes:
| > | > You don't, it is done via the bootp or dhcp record option 128 for example
| > | >           option option-128 "192.168.2.254:/usr/work/netboot";
| > | > You then have to make the swap file in that directory of format
| > | >       swap.<IP of client>
| > | > Use dd to create the file by copying /dev/zero for the size you want.
| > | > 
| > | > Note during boot up the kernel will tell you what it is using for 
| > | > swap via this request.
| > | 
| > | The option-128 confuse the pxeboot program. If I put
| > | 
| > | option root-path "/export/diskless";
| > | option option-128 "10.1.2.3:/export/shark";
| > | 
| > | in the dhcpd.conf file, pxeboot tries to mount /export/sharkM-^[^B-i?
| > | as the root filesystem. Removing the option-128 line at least get me to
| > | boot albeit without swap.
| > 
| > Root path should have the IP address of the server such as:
| >            option root-path "192.168.2.254:/usr/home/ambrisko/netboot";
| > 
| > Then in boot messages you should see:
| > 	rootfs is 192.168.2.254:/usr/home/ambrisko/netboot
| > 	swapfs is 192.168.2.254:/usr/work/netboot
| > 
| 
| Yes, you are right. Putting the ip number in the root-path cures the
| pxeboot failure. But is still only configure the NFS ROOT according
| to the kernel's output. I had a look at the pxe code in
| /sys/boot/i386/libi386/pxe.c where pxeboot is built from and in
| /sys/i386/i386/autoconf.c which is the kernel side and it looks like
| they don't do anything about swap. There is a /* XXX set up swap? */
| placeholder though. :-)

Yep looks like you're right, I just tried it on 4.2-BETA it worked in 
4.1.1.  Swap is now broken ... sigh this is going to be a problem.  I 
guess the only thing you might be able to do in the interim is to do a 
vnconfig of a file and then mount that as swap.  I think the vnconfig 
man pages describes this.  Hopefully it works over NFS.

Doug A.


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