Earlier we have covered how to setup pxe server. Now we will see how to run ubuntu live cd from pxe.
Mount ubuntu live iso on pxe server
mkdir /mnt/iso mount ubuntu-10.04-desktop-i386.iso /mnt/iso
Create nfs share for ubuntu & copy all the content of live cd to it
mkdir /nfs-share/ubuntu cd /mnt/iso/ cp -av * /nfs-share/ubuntu/
Entries in nfs share export file
cat /etc/exports
/nfs-share/ubuntu/ *(no_root_squash,rw,async)
Refresh nfs entries
exportfs -rvEntries in pxelinux.cfg/default my root directory of tftpboot is /tftpboot
LABEL Ubuntu kernel /tftpboot/images/ubuntu/vmlinuz append boot=casper netboot=nfs nfsroot=192.168.3.20:/nfs-share/ubuntu initrd=/tftpboot/images/ubuntu/initrd.lz
Copy initrd and vmlinuz from Ubuntu live cd to tftpboot
cd /nfs-share/ubuntu/casper cp vmlinuz initrd.lz /tftpboot/images/ubuntu/
Thats it. Run your pxe client and choose ubuntu.
UPDATE
After installing Ubuntu if your network is not working then you need to modify interface settings in /etc/network/interfaces. Change it to
auto eth0 iface eth0 inet dhcp
#DHCP if you are taking ip from DHCP server else mention it as static and provide ip address.
Authors bio is coming up shortly. 
Nice post
j’ai bien suivi ce tuto mais sa fonctionne pas
il ya-il d’autres configurations à faire de plus ? merci d’avance
Any error you are getting over here?