################################################################################
#  Create a generic HPC image 
#  This script is an example of how to create an HPC image with xCAT stateless.
#  in this example you may need to change some of the parameters.  In the future
#  we should probably place this in the database...
#  All good sys admins can reproduce their environments.  Creating a stateless 
#  image should be reproducable.  Doing this with a script is a good idea.
#  
################################################################################


# specify the OS stuff.  You'll probably want to change this.  If you do then you'll
# need to make sure there is a *.pkglist and *.exlist
PROFILE=compute
ARCH=x86_64
OS=centos5.3

# this is where the OS image will reside
IMGROOT=/install/netboot/$OS/$ARCH/$PROFILE/rootimg

# remove the old image if it exists.
rm -rf /install/netboot/$OS/$ARCH/$PROFILE

# generate the base image
# for IBM: tg3 in older blades, bnx in newer stuff, and igb in the nehalem based products.
/opt/xcat/share/xcat/netboot/centos/genimage -i eth0 -n libphy,tg3,bnx2,igb -o $OS -p $PROFILE

# update the yum database in the image
rm -rf $IMGROOT/etc/yum.repos.d
yum --installroot=$IMGROOT clean all
cp -a /etc/yum.repos.d/ $IMGROOT/etc/
rm -rf $IMGROOT/etc/yum.repos.d/xCAT-*

# no selinux!!
echo SELINUX=disabled > $IMGROOT/etc/sysconfig/selinux

# fix respawns
cp $IMGROOT/etc/inittab $IMGROOT/etc/inittab.ORIG
grep -v 38400 $IMGROOT/etc/inittab.ORIG  > $IMGROOT/etc/inittab

# filesystem setup, you'll want to customize this.  We have swap and scratch
# configured here.  But if you don't have disks then this may not help.
# we name our / partition the image name (compute by default) plus a timestamp.

TIME=`date +%s`
cp $IMGROOT/etc/fstab $IMGROOT/etc/fstab.ORIG
echo "proc /proc proc rw 0 0
sysfs /sys sysfs rw 0 0
devpts /dev/pts devpts rw,gid=5,mode=620 0 0
$PROFILE-$TIME / tmpfs rw 0 1
#/dev/sda1  swap  swap defaults 0 0
#/dev/sda2  /scratch ext3 defaults 0 0
" > $IMGROOT/etc/fstab
mkdir $IMGROOT/scratch 

### get ntp to start on boot
chroot $IMGROOT chkconfig --level 345 ntpd on

#### user stuff so that we can do some work ####
cp /etc/shadow $IMGROOT/etc/
cp /etc/group $IMGROOT/etc/
cp /etc/passwd $IMGROOT/etc/
cp /etc/hosts $IMGROOT/etc/

### scaling fixes #####
echo "# increase TCP max buffer size
net.core.rmem_max = 33554432
net.core.wmem_max = 33554432
net.core.rmem_default = 65536
net.core.wmem_default = 65536
# increase Linux autotuning TCP buffer limits
# min, default, and max number of bytes to use
net.ipv4.tcp_rmem = 4096 33554432 33554432
net.ipv4.tcp_wmem = 4096 33554432 33554432
net.ipv4.tcp_mem= 33554432 33554432 33554432
net.ipv4.route.flush=1
net.core.netdev_max_backlog=1500

#GPFS / NFS Tuning
net.ipv4.conf.all.arp_filter = 1
net.ipv4.conf.all.rp_filter = 1
net.ipv4.neigh.default.gc_thresh1 = 1024
net.ipv4.neigh.default.gc_thresh2 = 4096
net.ipv4.neigh.default.gc_thresh3 = 8192
net.ipv4.neigh.default.gc_stale_time = 24" >> $IMGROOT/etc/sysctl.conf

## Limits: need to make sure users can have unlimited memory (ulimit -l unlimited)
cp /etc/security/limits.conf $IMGROOT/etc/security/

### add torque ### 
/opt/xcat/share/xcat/netboot/add-on/torque/add_torque $IMGROOT mgt /opt/torque / local

# update the limit on pegged memory limit and if they have old xCAT then make sure
# it says torque instead of pbs in the paths of the config file.
perl -pi -e 's/ulimit -n 20000/ulimit -n 20000; ulimit -l unlimited/g' $IMGROOT/etc/init.d/pbs_mom
perl -pi -e 's/spool\/pbs/spool\/torque/g' $IMGROOT/etc/init.d/pbs_mom
perl -pi -e 's/spool\/pbs/spool\/torque/g' $IMGROOT/etc/init.d/pbs_mom
perl -pi -e 's/PBS_HOME=\/var\/spool\/pbs/PBS_HOME=\/var\/spool\/torque/g' $IMGROOT/var/spool/torque/mom_priv/epilogue
perl -pi -e 's/PBS_HOME=\/var\/spool\/pbs/PBS_HOME=\/var\/spool\/torque/g' $IMGROOT/var/spool/torque/mom_priv/prologue
perl -pi -e 's/PBS_HOME=\/var\/spool\/pbs/PBS_HOME=\/var\/spool\/torque/g' $IMGROOT/var/spool/torque/mom_priv/takedownnode

### stateless init script does NTP, syslog, etc. ####
cp /etc/localtime $IMGROOT/etc/
cp /opt/xcat/share/xcat/netboot/add-on/stateless/stateless $IMGROOT/etc/init.d/
perl -pi -e 's!Mountain!Mexico/General!g' $IMGROOT/etc/init.d/stateless
perl -pi -e 's/driftfile \/etc\/ntp/driftfile \/var\/lib\/ntp/g' $IMGROOT/etc/init.d/stateless
perl -pi -e 's/keys \/etc\/ntp/keys \/var\/lib\/ntp/g' $IMGROOT/etc/init.d/stateless
rm -rf $IMGROOT/etc/sysconfig/clock
chroot $IMGROOT chkconfig --level 345 stateless on
chroot $IMGROOT chkconfig --level 345 rsyslog on

### make sure dhcp boot protocol is set to none ###
perl -pi -e 's/dhcp/none/g' $IMGROOT/etc/sysconfig/network-scripts/ifcfg-eth0

#### add GPFS stuff ###
# this is an example of a stateless GPFS implementation.  Uncomment the below if you 
# want GPFS.  Make sure you have the GPFS RPMs to do this.
#GPFSSRCDIR=/install/GPFS
#yum --installroot=$IMGROOT -y install glibc ksh compat-libstdc++-33 binutils rsh
#rpm -ivh --root=$IMGROOT $GPFSSRCDIR/gpfs.base*rpm
#rpm -ivh --root=$IMGROOT $GPFSSRCDIR/gpfs.gpl*rpm
#rpm -ivh --root=$IMGROOT $GPFSSRCDIR/gpfs.msg*rpm
#rpm -Uivh --root=$IMGROOT $GPFSSRCDIR/updates/gpfs.base*rpm
#rpm -Uivh --root=$IMGROOT $GPFSSRCDIR/updates/gpfs.gpl*rpm
#rpm -Uivh --root=$IMGROOT $GPFSSRCDIR/updates/gpfs.msg*rpm
##
#AUTOGPFSDIR=/opt/xcat/share/xcat/netboot/add-on/autogpfs
#cp $AUTOGPFSDIR/autogpfsc.pl $IMGROOT/usr/sbin
#cp $AUTOGPFSDIR/autogpfsc $IMGROOT/etc/init.d/
#echo "SERVERS=mgt
#PORT=3003
#BLOCK=no" >> $IMGROOT/etc/sysconfig/autogpfsc
#
#chroot $IMGROOT chkconfig --level 345 autogpfsc on
#cp $GPFSSRCDIR/2.6.18-128.el5/* $IMGROOT/usr/lpp/mmfs/bin/
#cp /etc/profile.d/gpfs.sh $IMGROOT/etc/profile.d/
### End GPFS Stuff ####


### IB Stuff ####
# if you have InfiniBand on your machines then you probably have an OFED distribution you
# need to add.  Here is an example of how to add it.
#echo "Adding InfiniBand"
#yum --installroot=$IMGROOT -y install bind-utils which rpm tcl tk glibc-devel.i386 pciutils expat libgfortran.x86_64 libgomp.x86_64 tcsh
#
#IBROOT=/install/voltaire/VoltaireOFED-1.4.2_2-k2.6.18-128.el5-x86_64
#mount -o bind /proc $IMGROOT/proc
#mount -o bind /sys $IMGROOT/sys
#mount -o bind $IBROOT $IMGROOT/mnt
#chroot $IMGROOT /mnt/install.sh --without-mpi
#umount $IMGROOT/mnt
#umount $IMGROOT/sys
#umount $IMGROOT/proc
# configure IB IP address
#echo "IP=\`host \$HOSTNAME-ib0 | awk '{ print \$4 }' | head -1\`" >> $IMGROOT/etc/rc.d/rc.local
#echo "ifconfig ib0 \$IP" >> $IMGROOT/etc/rc.d/rc.local
#echo "ifconfig ib0 netmask 255.255.0.0" >> $IMGROOT/etc/rc.d/rc.local
### End IB Stuff ####

# configure name resolution
# change this to what you want it to be.  (this is in site.tab as the domain and nameservers)
echo "search cluster.foo 
nameserver 172.20.0.1" >$IMGROOT/etc/resolv.conf


### uniq-i-fy Torque OS name
echo "opsys compute_centos5.3" >> $IMGROOT/var/spool/torque/mom_priv/config

packimage -p $PROFILE -a $ARCH -o $OS
echo "Image $PROFILE-$TIME created"