= DRBL Merge Kerrighed = 
[[BR]]

 == Introduction ==
People need powerful computing resources to resolve complex problems. A important issue is how to easy build cheap and effective computing resource. We use DRBL and Kerighed to build SSI cluster. It quick to deploy your cluster environment. You just install them in one machine (Server), clients don't install any OS. Client only setup PXE (network boot) in BIOS, when client finish network booting that your cluster is OK!
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 == Software ==
We use below Software:
 * Ubuntu or Debian
||Linux Distribution.||
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 * DRBL
||Diskless Remote Boot in Linux (DRBL) provides a diskless or systemless environment for client machines. It works on Debian, Ubuntu, Mandriva, Red Hat, Fedora, CentOS and SuSE. DRBL uses distributed hardware resources and makes it possible for clients to fully access local hardware. It also includes Clonezilla, a partitioning and disk cloning utility similar to Symantec Ghost. 
http://drbl.sourceforge.net/||
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 * Kerrighed
||Kerrighed is a Single System Image operating system for clusters. Kerrighed offers the view of a unique SMP machine on top of a cluster of standard PCs. The new version is Kerrighed 2.2.0, and it used for 2.6.20 kernel.
http://www.kerrighed.org/wiki/index.php/Main_Page||
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 == Install Kerrighed ==
 * Install Basic Package
{{{
sudo aptitude install gcc-3.3 automake autoconf libtool initramfs-tools make
sudo aptitude install kernel-package libncurses5-dev build-essential fakeroot wget bzip2 
sudo aptitude install xmlto lsb-release 
sudo aptitude install nfsbooted 
}}}

 * Download Kerighed tar ball
{{{
cd /usr/src
sudo wget https://gforge.inria.fr/frs/download.php/3791/kerrighed-2.2.1.tar.gz
sudo wget http://www.kernel.org/pub/linux/kernel/v2.6/linux-2.6.20.tar.bz2 

sudo tar -zxvf kerrighed-2.2.0.tar.gz
sudo tar -jxvf linux-2.6.20.tar.bz2 
}}}

 * Config and make Kerrighed-enable kernel, modules
{{{
cd kerrighed-2.2.0 
sudo ./configure --with-kernel=/usr/src/linux-2.6.20 --disable-kernel-config --with-kernel-config=/usr/src/linux-2.6.20/.config 
sudo make patch 

sudo mv /bin/sh /bin/sh.old
sudo ln -s /bin/bash /bin/sh
(Ubuntu default sh is link to dash) 

(1)Choose kernel options
cd ../linux-2.6.20 
sudo make defconfig
sudo make menuconfig
(0.If your CPU arch is intel, choose i386 
 1.Cancel Preemption, KEYS  and SMP options 
 2.Enable netwok block device, plug and play, NIC Driver and boot from nfs must to build-in
)
 
(2)Make
cd /usr/src/kerrighed-2.2.0
sudo make kernel 
sudo make 
sudo make kernel-install 
sudo make install  
}}}

 * Make initrd image
{{{
sudo mkinitramfs -o /boot/initrd.img-2.6.20-krg 2.6.20-krg
sudo vim /boot/grub/menu.lst 

(ex:
title           Kerrighed 2.6.20-krg
root            (hd0,0)
kernel          /boot/vmlinuz-2.6.20-krg root=UUID=8bc93e80-35f9-41db-a349-02e839f2ed7c ro quiet splash
initrd          /boot/initrd.img-2.6.20-krg
quiet
savedefault
)
}}}

 * config nodes information
{{{
(ex:
session=7
nbmin=8
krg001:0:eth0
krg002:1:eth0
krg003:2:eth0
krg004:3:eth0
krg005:4:eth0
krg006:5:eth0
krg007:6:eth0
krg008:7:eth0
)
}}}

 == Install DRBL ==

 * add deb source
{{{
sudo vim /etc/apt/sources.list 
(add :  deb http://free.nchc.org.tw/drbl-core drbl stable)

wget http://drbl.nchc.org.tw/GPG-KEY-DRBL sudo apt-key add GPG-KEY-DRBL 
sudo apt-get update
}}}

 * install DRBL
||Before we install DRBL, we must clear plan our DRBL environment. The below layout is our environment, eth0 used to connect WAN, eth1 used for DRBL internal clients.

             NIC     NIC IP                              Clients 
+-----------------------------+ 
|     DRBL SERVER         | 
|                                         | 
|     +-- [eth0] 140.110.X.X  +- to WAN 
|                                         | 
|     +-- [eth1] 192.168.0.1 +- to clients group 1 [ 7 clients, their IP from 192.168.0.2 - 192.168.0.8] 
|                                         |
+-----------------------------+ 
||