Setup PXE Boot using Centos and dhcpd, tftp and syslinux

This is something I often setup for clients because it's very helpful for people in datacenters, this allows custom OS installs on demand, you can customize it more by using kickstart etc.. but here's a base I use before customizing more:

This little script below will install everything you need to get booting by PXE Linux.

It also assumes you set a local IP (be sure not to overwrite your existing IP) on eth0:0 (note the :0) as and it takes a simple iptables command to NAT/Masquerade everything so the NAT clients can get to the public internet (you could also use public IPs if they are available but I prefer not to do this).

yum -y install tftp-server syslinux dhcp

#note the /tftpboot directory this will be the base directory we work from
#this will contain syslinux files and our boot images

mkdir -p /tftpboot/images
#copy syslinux to /tftpboot
cp /usr/share/syslinux/pxelinux.0 /tftpboot
cp /usr/share/syslinux/menu.c32 /tftpboot
cp /usr/share/syslinux/memdisk /tftpboot
cp /usr/share/syslinux/mboot.c32 /tftpboot
cp /usr/share/syslinux/chain.c32 /tftpboot

#create Centos 6 basedir and others like this
#copy the /pxeboot from the mirror of Centos:
mkdir -p /tftpboot/images/centos/6.3/x64
cd /tftpboot/images/centos/6.3/x64

#set /etc/dhcpd.conf for booting:
cat <<'EOF' > /etc/dhcpd.conf
allow booting;
allow bootp;
option option-128 code 128 = string;
option option-129 code 129 = text;
filename "/pxelinux.0";
#to make dhcpd happy or it won't start

ddns-update-style none;

#next, my one and only subnet

subnet netmask {
 option routers;
 option domain-name-servers;

mkdir -p /tftpboot/pxelinux.cfg/

cat << 'EOF' > /tftpboot/pxelinux.cfg/default
default menu.c32
prompt 5
timeout 300

LABEL Centos6.3x64
 MENU Label 6364
 kernel ../images/centos/6.3/x64/vmlinuz
 append initrd=../images/centos/6.3/x64/initrd.img

#enable tftp

#important for tftp set the server_args to /tftpboot or it will look in the wrong spot
#you'll get errors like PXE-T01: File not found
#PXE-E3B: TFTP Error - File not found
#set the following in /etc/xinet.d/tftp
        server_args             = -s /tftpboot

chkconfig tftp on
#restart dhcp server
service dhcpd restart
#start xinetd
service xinetd start

#set eth0:0 IP to
#set iptables masquerade
iptables -t nat -A POSTROUTING -m iprange --src-range -j MASQUERADE

# the issue is that in Centos 6 the config is located in /etc/dhcp/dhcpd.conf and NOT /etc/dhcpd.conf (this one is ignored and useless)!
#Dec 18 00:34:38 fs12home dhcpd: Not configured to listen on any interfaces!


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