X Windows Terminal

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Revision as of 21:00, 21 June 2006

Advantages

X Windows can be used in a Server-Client relationship. By setting up your X Windows Server you allow the use of all the programs on that computer to all the client PC's.

There are many advantages of running client computers in this manner:

They don't even need a hard drive.
It's silent as there are no moving parts
The solution saves power as your computers are very thin.
Everything can be backed up centrally.
Boot times for client PC's are the fastest around.
Clients don't need much CPU speed, memory, etc. Because of this they would be very cheap. You could get away with using a Pentium 100Mhz with 32MB ram, no hard drive, no CD-ROM, no Floppy and a fanless power supply. You just need a ethernet card with a PXEBOOT ROM.

Running a single application

To get started I have my server setup running FreeBSD, with X-Windows and a few applications. Nothing too special. Then I have my client PC, which to start off I used the freesbie 1.1 boot CD to perform these initial tests. You can get this from www.freesbie.org. I entered into fluxbox, but you could equally use xfce4.

client# xhost +

This allows all computers to start applications on your client PC. It's dangerous but good for testing everything is setup correctly.

client# ssh <server user@server ip>
eg: ssh mick@192.168.1.1

ssh$ DISPLAY=<client ip>:<client display>; export DISPLAY
eg: DISPLAY=192.168.1.2:0; export DISPLAY

ssh$ xcalc &

This should display on your client

Running a whole X Windows Session (XDM)

server

edit:

/usr/X11R6/lib/X11/xdm/xdm-config

comment out with a '!' the request line

DisplayManager.requestPort: 0

edit:

/usr/X11R6/lib/X11/xdm/Xaccess

to have a single asterisk any where in the file, so the contents should be one asterisk and the rest commented out.

Make sure your firewall has all traffic for you lan. (Need to know which exact ports to allow).

create ~/.xsession for each user which requires access and enter your start up for x eg:

shell#!/bin/sh

startkde

run xdm on server as root

client

make sure your not in X

type this command:

shell# X -broadcast

This assumes that you are running only one server. Otherwise use:

shell# X -query 192.168.1.2

GRUB Floppy boot

(would like to compile this ourselves later) To get started we downloaded the image from www.hp.uab.edu/~ed/grub-net

shell# dd if=/data/grub-net.img of=/dev/fd0

Then we mounted it as msdos Remove/rename menu.1st from the grub directory as it was doing something funny with it. We think that it was looking for a tftp server through our dhcp and we don't have a the dhcp setup correctly here, so we wanted to do it manually.

Reboot off the floppy now..

grub> ifconfig --address=192.168.1.2 --mask=255.255.255.0 --gateway=192.168.1.1
--server=192.168.1.2

OR you can use dhcp

grub> dhcp
 
grub> tftpserver 192.168.1.2

Setup tftp on your server, we created a directory /tftpboot.

Install and setup dhcp

Server setup.

install /usr/ports/net/isc-dhcp3-server

We do this so we can define the root path for the diskless system.

edit /usr/local/etc/dhcpd.conf

option domain-name "iinet.net.au";
option domain-name-servers 203.0.178.191;

# The shared root file system of diskless workstation
option root-path "192.168.1.2:/diskless_ro";

# The server from which to upload the initial boot-file (loads tftp server)
next-server 192.168.1.2;

default-lease-time 3600;
max-lease-time 86400;
ddns-update-style none;

subnet 192.168.1.0 netmask 255.255.255.0 {
        range 192.168.1.10 192.168.1.30;

        # Set up default gateway
        option routers 192.168.1.1;
}

shell# dhcpd

Setting NFS

Network File System. Here we share all the directories from the server so that the diskless clients see these drives as if those directories were the diskless client's.

# mkdir /diskless_ro
# chmod 444 /diskless_ro

# mkdir /diskless_rw
# chmod 777 diskless_rw

Make directories for each IP for your clients

# cd /diskless_rw
# mkdir 192.168.1.XXX
# cd 192.168.1.XXX
# mkdir etc var

Enable NFS /etc/rc.conf

rpcbind_enable="YES"
nfs_server_enable="YES"
nfs_server_flags="-u -t -n 20 -h 192.168.1.2"

Configure /etc/exports

# file systems accessible only for reading:
/usr -ro -maproot=0 -network 192.168.1.0 -mask 255.255.255.0
/diskless_ro -ro -maproot=0 -network 192.168.1.0
        -mask 255.255.255.0

# file systems accessible for writing. All the resources
# given to every diskless station are specified by one line:
#
# Diskless-20
/diskless_rw/192.168.1.20/etc /diskless_rw/192.168.1.20/var \
        -mapall=root 192.168.1.20

Starting NFS

data# rpcbind
data# nfsd -u -t -n 20 -h 192.168.1.2
data# mountd -r

Testing to see if the exports are correct

data# showmount -e
Exports list on localhost:
/usr                               192.168.1.0
/diskless_rw/192.168.1.20/var      192.168.1.20
/diskless_rw/192.168.1.20/etc      192.168.1.20
/diskless_ro                       192.168.1.0

Starting diskless system through GRUB

This is an alternative boot loader. You can use this for testing, if you don't have a pxeboot chip, otherwise skip this section.

These commands are half working...

grub> root (nd)

grub> kernel /kernel root=ad0s1a

grub> pxeboot

Completely Diskless System (PXEBOOT ROM)

Running completely diskless by booting from a Network ROM Chip.

We have now got a Intel GD82559 Etherexpress pro/100 Card.

When we boot up on the client machine with that card it displays:

Intel UNDI, PXE-2.0 (build 067)
Copyright (C) 1997-1998 Intel Corporation

Which we cannot get working so we have read that you have to update this version to Build 82.

copy /boot/pxeboot to /tftpboot directory we made before

- Downloaded proboot.exe from support.intel.com and unpacked into a windows box.
- Copied ibautil.exe onto a windows 98 boot disk.
- Rebooted the test box after disabling network boot on the nic (otherwise it'll kick in before the floppy).
- Ran ibautil -iv to see what embedded image versions were available:

Intel(R) Boot Agent XG v1.0.09
Intel(R) Boot Agent GE v1.2.36
Intel(R) Boot Agent FE v4.1.19

- Ran ibautil -up to perform the image upgrade.

It's interesting to note that no version showed up for out intel nic when initially running ibautil. After the upgrade, however, the version corectly showed as 4.1.19.

I made sure that I had simular features to this in my dhcpd.conf file:
option broadcast-address 192.168.254.255;
option domain-name-servers 192.168.254.3;
option domain-name "simerson.net";
option routers 192.168.254.1;
option subnet-mask 255.255.255.0;
server-name "pxe-gw";
server-identifier 192.168.254.3;
next-server 192.168.254.3;
default-lease-time -1;

subnet 192.168.254.0 netmask 255.255.255.0 {
range 192.168.254.32 192.168.254.99;
option root-path "/usr/local/export/pxe";
filename "pxeboot";
}
host cm.simerson.net {
hardware ethernet 00:e0:18:98:f0:cc;
fixed-address 192.168.254.126;
}
host c1.simerson.net {
hardware ethernet 00:60:97:0e:bb:a7;
fixed-address 192.168.254.131;
}