PXE boot/Kickstart CentOS 6.3 Install

A PXE install server allows your client computers to boot and install a Linux distribution over the network, without the need of burning Linux iso images, or human interaction.

For this tutorial I use a machine that has two network interfaces:
eth0: 10.34.132.149/255.255.254.0 (WAN interface)
eth1: 172.20.30.1/255.255.255.0 (LAN interface)

To install a PXE server, you will need the following components:
DHCP Server
TFTP Server
NFS/FTP/HTTPD server (to store installing files)

Note:

* DHCP Server will listen only on eth1.
* In this tutorial I will use HTTPD server.

1. Install required packages

yum install dhcp tftp tftp-server syslinux wget vim httpd

2. Configure DHCP Server

vim /etc/dhcp/dhcpd.conf

#--SystemImager vars - if you don't have SystemImager you can delete the following lines
######
option option-100 code 100 = string;
option option-128 code 128 = string;
option option-129 code 129 = text;
option option-140 code 140 = string;
option option-141 code 141 = unsigned integer 32;
option option-142 code 142 = string;
option option-143 code 143 = string;
option option-144 code 144 = string;
option option-144 "n";
option option-140 "172.20.30.1"; # this must be the IP address of the SI server where images reside
######

ddns-update-style ad-hoc;
log-facility syslog;

option domain-name "test.org";
option domain-name-servers 172.20.30.1;
option subnet-mask 255.255.255.0;
subnet 172.20.30.0 netmask 255.255.255.0 {
    authoritative;
    range 172.20.30.10 172.20.30.90; # ip range
    option routers 172.20.30.1; # gateway for clients
    ######
    # in case want to deny clients that are not configured in dhcpd uncomment the following line
    ######
    #deny unknown-clients;
    allow booting;
    allow bootp;
    next-server 172.20.30.1; # tftpd server's IP
    filename "pxelinux.0";

    ######
    # sample of a client that has mac address reserved on dhcp
    ######
    #host guest1 {
    #    hardware ethernet 00:0C:29:14:DA:AD;
    #    fixed-address 172.20.30.15;
    #}
    ######
}

3. Force DHCP Server to listen only on eth1

vim /etc/sysconfig/dhcpd
:%s/DHCPDARGS=/DHCPDARGS=" eth1 "/
:wq

 

4. Configure TFTP Server. Set disable from yes to no, and change the root directory on startup from /var/lib/tftpboot to /tftpboot

vim /etc/xinetd.d/tftp

service tftp
{
        socket_type             = dgram
        protocol                = udp
        wait                    = yes
        user                    = root
        server                  = /usr/sbin/in.tftpd
        server_args             = -s /tftpboot
        disable                 = no
        per_source              = 11
        cps                     = 100 2
        flags                   = IPv4
}

5. Setup TFTP Server network boot files

 

mkdir -p /tftpboot
chmod 777 /tftpboot
 
cp -v /usr/share/syslinux/pxelinux.0 /tftpboot
cp -v /usr/share/syslinux/menu.c32 /tftpboot
cp -v /usr/share/syslinux/memdisk /tftpboot
cp -v /usr/share/syslinux/mboot.c32 /tftpboot
cp -v /usr/share/syslinux/chain.c32 /tftpboot
 
mkdir /tftpboot/pxelinux.cfg
mkdir -p /tftpboot/netboot/centos/6.3/i386
 
cd /tftpboot/netboot/centos/6.3/i386
wget -c ftp://ftp.ines.lug.ro/centos/6.3/os/i386/images/pxeboot/initrd.img
wget -c ftp://ftp.ines.lug.ro/centos/6.3/os/i386/images/pxeboot/vmlinuz

 

6. Encode root password used for clients

openssl passwd -1 "your_password"

 

$1$LY1EPt3P$BvVLJ.7yyzaDy/7zxmakr.

7. Create a new kickstart file

vim /var/www/html/netboot/centos/6.3/i386/centos6.3-ks.cfg

 

install
firewall --disabled
url --url="ftp://ftp.ines.lug.ro/centos/6.3/os/i386"
network  --bootproto=dhcp --device=eth0
rootpw --iscrypted $1$LY1EPt3P$BvVLJ.7yyzaDy/7zxmakr.
text

%include /tmp/network.ks

keyboard us
lang en_US
selinux --disabled
skipx
logging --level=info
reboot
timezone --utc Europe/Bucharest
bootloader --location=mbr  --driveorder=sda,sdb --append="console=tty0 console=ttyS0,115200N1"
zerombr
clearpart --all --initlabel 
part / --fstype="ext4" --size=10000
part swap --fstype="swap" --size=8000
part pv.01 --fstype="ext4" --grow --size=1
volgroup vg0 pv.01
logvol /data --vgname=vg0 --percent=90 --name=lv0 --fsoptions=noatime --fstype=ext4 --size=1 --grow 

%packages 
@core
sed.i686           
perl.i686
less.i686          
dmidecode.i686     
bzip2.i686         
iproute.i686       
iputils.i686       
sysfsutils.i686    
rsync.i686         
nano.i686          
mdadm.i686         
setserial.i686     
man-pages.noarch     
findutils.i686     
tar.i686           
net-tools.i686     
tmpwatch.i686      
lsof.i686           
python.i686         
screen.i686
lvm2.i686             
curl.i686             
ypbind.i686           
yp-tools.i686          
smartmontools.i686     
openssh-clients.i686   
acpid.i686             
irqbalance.i686        
which.i686             
bind-utils.i686        
ntsysv.i686            
ntp.i686               
man.i686                   
mysql.i686                 
postfix.i686               
chkconfig.i686             
gzip.i686                  
net-snmp.i686
%end

%pre
#!/bin/sh

echo "network --device eth0 --bootproto dhcp --hostname localhost.localdomain" > /tmp/network.ks

for x in `cat /proc/cmdline`; do
        case $x in SERVERNAME*)
            eval $x
        echo "network --device eth0 --bootproto dhcp --hostname ${SERVERNAME}" > /tmp/network.ks
                ;;
            esac;
    done
%end

%post

cat > /etc/cron.d/ntpdate <<EOF
0 */2 * * * /usr/sbin/ntpdate pool.ntp.org 1> /dev/null 2>&1
EOF

cat > /etc/snmp/snmpd.conf <<EOF
com2sec readonly     default       AW_PUB
com2sec readwrite    default      AW_RW_PRIV
group MyRWGroup  v1        readwrite
group MyROGroup  v1        readonly
view all    included  .1                               80
access MyROGroup ""      any       noauth    exact     all    none   none
access MyRWGroup ""      any       noauth    exact      all    all    all
syslocation Unknown (edit /etc/snmp/snmpd.conf)
syscontact Root <root@localhost> (configure /etc/snmp/snmp.local.conf)
disk / 10000
pass .1.3.6.1.4.1.2021.255 /usr/sbin/ucd-snmp-vmstat
extend .1.3.6.1.4.1.2021.8.101 vs /usr/sbin/vendiostats.pl
EOF

chkconfig ntpd on
chkconfig snmpd on
chkconfig sshd on
chkconfig ypbind on
chkconfig iptables off
chkconfig ip6tables off
chkconfig yum-updatesd off
chkconfig haldaemon off
chkconfig mcstrans off
chkconfig sysstat off

cat > /etc/motd <<EOF

This server was deployed with kickstart with the centos6.3-ks.cfg configuration file. 

Install finished at:
EOF

date >> /etc/motd

echo >> /etc/motd
%end

8. Create PXE menu file

vim /tftpboot/pxelinux.cfg/default

 

default menu.c32
prompt 0
timeout 300
MENU TITLE test.org PXE Menu

LABEL centos6.3_i386
    MENU LABEL CentOS 6.3 i386 
    KERNEL /netboot/centos/6.3/i386/vmlinuz
    APPEND console=tty0 console=ttyS0,9600N1 initrd=/netboot/centos/6.3/i386/initrd.img ks=http://172.20.30.1/netboot/centos/6.3/i386/centos6.3-ks.cfg ksdevice=link

9. Disable SELINUX

vim /etc/sysconfig/selinux
:%s/SELINUX=enforcing/SELINUX=disabled
:wq

 

10. Share the internet connection with clients

vim /etc/sysctl.conf
:%s/net.ipv4.ip_forward = 0/net.ipv4.ip_forward = 1
:wq

 

Apply the settings:

sysctl -p

Share internet connection using iptables:

iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
service iptables save

11. Final service setup

chkconfig dhcpd on
chkconfig xinetd on
chkconfig iptables on
chkconfig httpd on
chkconfig iptables6 off
chkconfig ip6tables off

12. Reboot the server

reboot

Links:
http://monzell.com/post/15547967527/automatically-set-the-hostname-during-kickstart
http://kaivanov.blogspot.ro/2010/09/how-to-install-centos-pxe-server.html

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