redwood
Guru
Joined: 27 Jan 2006
Posts: 306
|
 Posted: Tue Oct 28, 2008 12:23 am Post subject: genkernel + gPXE + diskless+unionfs problem |
 |
|
I have an etherboot+ltsp-4.2 working setup which I'd like to convert to my own
gentoo-compiled diskless setup with unionfs.
I've followed the guide
http://www.gentoo.org/doc/en/diskless-howto.xml
as well as the forum discussion
http://www.gentoo.org/doc/en/diskless-howto.xml
and wimalopaan's 2005 German guide
http://mozart.informatik.fh-kl.de/download/Software/GentooDiskless/diskless.pdf
and the updated English version
http://mozart.informatik.fh-kl.de/download/Software/GentooDiskless/diskless2_en.pdf
wimalopaan's guide modifies numerous /etc/init.d/scripts by commenting out services which
are no longer needed; whereas the updated guide includes a "stateless.sh" script to replace the
bootup init script.
/tftpboot/gentoo/boot/stateless.sh:
| Code: | #!/bin/bash
MODPROBE=/sbin/modprobe
IFCONFIG=/sbin/ifconfig
ahostname (){
MYHOST="$1_`$IFCONFIG eth0 | awk '/HWaddr/ {print $5}' | tr -d ':'`"
echo "STATELESS: Setting Hostname to $MYHOST"
echo "HOSTNAME=\"$MYHOST\"" > /etc/conf.d/hostname
/bin/hostname "$MYHOST"
}
getparams() {
local cmdline=$(dmesg | grep "^Kernel command line" | sed 's/^Kernel command line ://g')
for pp in cmdline; do
echo $pp | grep '^stateless=' >/dev/null 2>&1
if [ $? -eq 0 ]; then
echo $pp | sed 's/stateless=//g'
return 0
fi
done
echo ""
return 1
}
isset() {
for p in $( getparams | tr ',' ' ' ); do
if [ "$p" == "$1" ]; then
return 0
fi
done
return 1
}
aunionfs() {
isset unionfs
if [ $? -eq 0 ]; then
echo "STATELESS: Loading module unionfs ..."
$MODPROBE unionfs
while [ "$1" != "" ]; do
echo "STATELESS: Mounting tmpfs $1 ..."
mount -n -t tmpfs -o defaults none /mnt/unionfs/$1
echo "STATELESS: Mounting $1 unionfs ..."
mount -n -t unionfs -o dirs=/mnt/unionfs/$1=rw:/$1=ro none /$1
shift
done
else
echo "STATELESS: Not using unionfs as requested ..."
fi
}
aunionfs etc var
ahostname stateless
exec /sbin/init |
I downloaded gPXE from http://etherboot.org with git
and compiled and made a gPXE boot floppy.
I've created a 5G lvm2 ext3 partition mounted on /tftpboot/gentoo
and installed a fresh PentiumII system on that partition following my usual guide
http://www.gentoo.org/doc/en/gentoo-x86+raid+lvm2-quickinstall.xml
And I've compiled a client kernel using
| Quote: | | genkernel --splash --menuconfig all |
with my nic drivers compiled in as well as
the following networking options
| Code: | Networking --->-*- Networking support Networking options --->
[*] IP: kernel level autoconfiguration
[*] IP: DHCP support
[*] IP: BOOTP support |
I created a /tftpboot/pxe directory (following the ltsp setup)
containing pxelinux.0 and the
symlink gentoo -> /tftpboot/gentoo (to find my diskless partition)
and the pxelinux.cfg directory containing the default setup:
| Code: | prompt 0
label linux
kernel /gentoo/boot/kernel-genkernel-x86-2.6.25-gentoo-r8
append ip=dhcp root=/dev/ram0 real_root=/dev/nfs nfsroot=192.168.1.254:/tftpboot/gentoo hard,intr,ro initrd=/gentoo/boot/initramfs-genkernel-x86-2.6.25-gentoo-r8 init=/gentoo/boot/stateless.sh vga=791 splash=silent,theme:defaultconsole=tty1 quiet |
My server:/etc/dhcp/dhcp.conf:
| Code: |
#(Some general options)
#Global defaults
not authoritative; # only primary servers use authoritative
#default-lease-time 21600; # 6 hours
#max-lease-time 21600; # 6 hours
default-lease-time 28800; # 8 hours
max-lease-time 86400; # 1 day
use-host-decl-names on;
ddns-update-style ad-hoc; # Dynamic DNS update style (off,interim,ad-hoc)
#(Bootp options)
allow booting;
allow bootp;
boot-unknown-clients false; # Prevent random machines
#(Network Options) 192.168.1.0/24
option subnet-mask 255.255.255.0;
option broadcast-address 192.168.1.255;
option routers 192.168.1.1; #The default gateway (our Linksys WRT54G router)
option domain-name-servers 192.168.1.254, 192.168.1.1;
option log-servers 192.168.1.254; #The box that accepts logging
#option nntp-server 10.0.0.11; # The Ntp time server
option domain-name "mydomain.net";
#range 10.0.0.100 10.0.0.150; # Comment this if you have another DHCP server
#(LTSP Path Options)
option root-path "192.168.1.254:/opt/ltsp/i386";
#option domain-name "ltsp.mydomain.net"; # A fake domain-name for our thin-clients
# Specify the TFTP server to be used
next-server 192.168.1.254;
option space PXE;
option PXE.mtftp-ip code 1 = ip-address;
option PXE.mtftp-cport code 2 = unsigned integer 16;
option PXE.mtftp-sport code 3 = unsigned integer 16;
option PXE.mtftp-tmout code 4 = unsigned integer 8;
option PXE.mtftp-delay code 5 = unsigned integer 8;
option PXE.discovery-control code 6 = unsigned integer 8;
option PXE.discovery-mcast-addr code 7 = ip-address;
option pxe-menu code 150 = text;
# gPXE-specific encapsulated options
#
option space gpxe;
option gpxe-encap-opts code 175 = encapsulate gpxe;
option gpxe.priority code 1 = signed integer 8;
option gpxe.no-proxydhcp code 176 = unsigned integer 8;
option gpxe.bus-id code 177 = string;
option gpxe.bios-drive code 189 = unsigned integer 8;
option gpxe.username code 190 = string;
option gpxe.password code 191 = string;
# Other options that may be useful
option iscsi-initiator-iqn code 203 = string;
#(If your workstations have ISA NICs uncomment the following)
#(lines and alter the driver and IO)
# PXE & legacy options
option option-128 code 128 = string; # required for PXE boot
option option-129 code 129 = text; # required for PXE boot
option option-128 e4:45:74:68:00:00; # magic value for PXE booting
shared-network WORKSTATIONS {
subnet 192.168.1.0 netmask 255.255.255.0 {
#(Distribute dynamic IPs to the workstations)
range 192.168.1.11 192.168.1.20;
use-host-decl-names on;
allow unknown-clients;
class "pxeclient" {
match if substring(option vendor-class-identifier, 0, 9) = "PXEClient";
vendor-option-space PXE;
option PXE.mtftp-ip 0.0.0.0;
#option pxe-menu "/pxe/grub.1st";
# This is the name of the file the boot ROMs should download.
#filename "/gentoo/boot/grub/pxegrub";
filename "/pxe/pxelinux.0"; #tftp gPXE kernel
#filename "http://my.web.server/pxe.0"; # http
}
# Provide Etherboot clients with appropriate information
class "etherboot" {
match if substring(option vendor-class-identifier, 0, 9) = "Etherboot";
filename "/lts/vmlinuz-2.6.17.8-ltsp-1"; # tftp Etherboot kernel
#filename "http://my.web.server/pxe.0"; # http boot
}
group DISKLESS { #workstation nodes
host ws002 {
hardware ethernet <mac address>;
option option-129 "NIC=8139too vga=788";
}
}
} |
My server:/etc/exportfs
| Code: | | /tftpboot/gentoo 192.168.1.*(ro,sync,no_all_squash,no_root_squash) |
and my client:/etc/fstab
| Code: | 192.168.1.254:/tftpboot/gentoo / nfs defaults,hard,intr,ro,rsize=8192 0 0
/dev/cdrom /mnt/cdrom auto noauto,ro 0 0
shm /dev/shm tmpfs nodev,nosuid,noexec 0 0
proc /proc proc defaults 0 0
none /mnt/unionfs/var tmpfs defaults 0 0
none /mnt/unionfs/etc tmpfs defaults 0 0
none /var unionfs dirs=/mnt/unionfs/var=rw:/var/=ro 0 0
none /etc unionfs dirs=/mnt/unionfs/etc=rw:/etc/=ro
none /tmp tmpfs defaults 0 0 |
After booting the diskless client with the gPXE boot floppy
the client correctly downloads /tftpboot/gentoo/boot/kernel-genkernel-x86-2.6.25-gentoo-r8
and begins booting.
However, it then tries to mount the root filesystem rw
which is denied by my server's /etc/exportfs line.
Is something wrong with my server's /tftpboot/pxe/pxelinux.cfg/default file?
THANKS for any ideas.
UPDATE:
the gentoo-wiki is off-line, but I've learned I need sys-kernel/mm-sources for unionfs support.
I've gotten my kernel to load using this
/tftpboot/pxe/pxelinux.cfg/default:
| Code: | kernel /gentoo/boot/linux
append ip=dhcp root=/dev/nfs nfsroot=192.168.1.254:/tftpboot/gentoo,hard,intr,ro tty:12 console=tty1 init=/boot/stateless.sh |
I just need to compile a kernel with unionfs support. |
|
Networking & Security
