系统环境：centos5.5

一、设置tftp服务器

1、安装tftp服务器

[root@EmployServer ~]# yum install tftp-server -y
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
 * base: mirrors.btte.net
 * extras: mirrors.btte.net
 * updates: mirrors.btte.net
Setting up Install Process
Resolving Dependencies
--> Running transaction check
---> Package tftp-server.i386 0:0.49-2.el5.centos set to be updated
--> Finished Dependency Resolution

Dependencies Resolved

================================================================================
 Package            Arch        Version                    Repository      Size
================================================================================
Installing:
 tftp-server        i386        0.49-2.el5.centos          updates         31 k

Transaction Summary
================================================================================
Install       1 Package(s)
Upgrade       0 Package(s)

Total download size: 31 k
Downloading Packages:
tftp-server-0.49-2.el5.centos.i386.rpm                   |  31 kB     00:00    
Running rpm_check_debug
Running Transaction Test
Finished Transaction Test
Transaction Test Succeeded
Running Transaction
  Installing     : tftp-server                                              1/1

Installed:
  tftp-server.i386 0:0.49-2.el5.centos                                         

Complete!

2、检查tftp配置文件

[root@EmployServer /]# vi /etc/xinetd.d/tftp
# default: off
# description: The tftp server serves files using the trivial file transfer \
#       protocol.  The tftp protocol is often used to boot diskless \
#       workstations, download configuration files to network-aware printers, \
#       and to start the installation process for some operating systems.
service tftp
{
        socket_type             = dgram
        protocol                = udp
        wait                    = yes
        user                    = root
        server                  = /usr/sbin/in.tftpd
        server_args             = -s /tftpboot
        disable                 = yes
        per_source              = 11
        cps                     = 100 2
        flags                   = IPv4
}
~
~
~
~
~
Type  :quit<Enter>  to exit Vim

3、设置tftp服务为开机启动

[root@EmployServer ~]# chkconfig --level 345 xinetd on
[root@EmployServer ~]# chkconfig tftp on

检查tftp服务状态

[root@EmployServer ~]# chkconfig --list|egrep "xinetd|tftp"
xinetd          0:关闭  1:关闭  2:关闭  3:启用  4:启用  5:启用  6:关闭
基于 xinetd 的服务：
        tftp:           启用


查看udp69端口

[root@EmployServer ~]# netstat -a |grep tftp;netstat -an |grep "udp.*69"
udp        0      0 *:tftp                      *:*                                    
udp        0      0 0.0.0.0:69                  0.0.0.0:*            


二、搭建NFS服务


1、验证nfs-utils包是否已经安装
[root@EmployServer ~]# yum list installed | grep nfs-utils
nfs-utils.i386                          1:1.0.9-44.el5                 installed
nfs-utils-lib.i386                      1.0.8-7.6.el5                  installed

Centos5.5默认已经安装好nfs服务


2、修改/etc/exports 文件，配置输出目录

/etc/exports 文件默认是空，需要自己配置

[root@EmployServer ~]# vi /etc/exports
/media/centos5.5   *(ro)
/anaconda/ks        *(ro)
~
~
~
~

~
"/etc/exports" 2L, 52C written

# *号代表所有网段的主机都可以访问此共享目录，ro 表明只读权限。

当然，系统中实际上还没有这两个目录，需要我们手动建立

[root@EmployServer ~]# mkdir /anaconda
[root@EmployServer ~]# mkdir /anaconda/ks
[root@EmployServer ~]# mkdir /media/centos5.5


3、开启nfs服务并设置随机启动

[root@EmployServer ks]# service nfs start
启动 NFS 服务：                                            [确定]
关掉 NFS 配额：                                            [确定]
启动 NFS 守护进程：                                        [确定]
启动 NFS mountd：                                          [确定]


[root@EmployServer ks]# chkconfig --level 345 nfs on
[root@EmployServer ks]# chkconfig --list|grep nfs
nfs             0:关闭  1:关闭  2:关闭  3:启用  4:启用  5:启用  6:关闭
nfslock         0:关闭  1:关闭  2:关闭  3:启用  4:启用  5:启用  6:关闭



三、 搭建dhcp服务

1、查看是否已经安装dhcp包

[root@EmployServer pxeboot]# rpm -qa |grep dhcp
dhcpv6-client-1.0.10-18.el5

默认没有安装dhcp包

2、安装dhcp包

[root@EmployServer pxeboot]# yum install dhcp
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
 * base: mirrors.btte.net
 * extras: mirrors.btte.net
 * updates: mirrors.btte.net
Setting up Install Process
Resolving Dependencies
--> Running transaction check
---> Package dhcp.i386 12:3.0.5-29.el5_7.1 set to be updated
--> Finished Dependency Resolution

Dependencies Resolved

======================================================================================================
 Package            Arch               Version                            Repository             Size
======================================================================================================
Installing:
 dhcp               i386               12:3.0.5-29.el5_7.1                updates               873 k

Transaction Summary
======================================================================================================
Install       1 Package(s)
Upgrade       0 Package(s)

Total download size: 873 k
Is this ok [y/N]: y
Downloading Packages:
dhcp-3.0.5-29.el5_7.1.i386.rpm                                                 | 873 kB     00:00    
Running rpm_check_debug
Running Transaction Test
Finished Transaction Test
Transaction Test Succeeded
Running Transaction
  Installing     : dhcp                                                                           1/1

Installed:
  dhcp.i386 12:3.0.5-29.el5_7.1                                                                      

Complete!

安装完毕，查看：

[root@EmployServer pxeboot]# yum list installed | grep dhcp
dhcp.i386                               12:3.0.5-29.el5_7.1            installed
dhcpv6-client.i386                      1.0.10-18.el5                  installed

[root@EmployServer pxeboot]# rpm -qa|grep dhcp
dhcpv6-client-1.0.10-18.el5
dhcp-3.0.5-29.el5_7.1

3、配置dhcp服务

dhcp的配置文件是 /etc/dhcpd.conf  此文件默认内容如下：

[root@EmployServer pxeboot]# cd
[root@EmployServer ~]# vi /etc/dhcpd.conf
#
# DHCP Server Configuration file.
#   see /usr/share/doc/dhcp*/dhcpd.conf.sample
#
~
~

~
"/etc/dhcpd.conf" [noeol] 4L, 86C


------------------------------------------------------------------
“#   see /usr/share/doc/dhcp*/dhcpd.conf.sample”所以我们可以按照sample文件的格式设置dhcpd.conf,格式一定要正确，否则dhcp服务没办法启动。


[root@EmployServer ~]# cd /usr/share/doc/dhcp
dhcp-3.0.5/           dhcpv6-client-1.0.10/
[root@EmployServer ~]# cd /usr/share/doc/dhcp-3.0.5/
[root@EmployServer dhcp-3.0.5]# ls
api+protocol                          draft-ietf-dhc-dhcp-dns-12.txt  README       rfc2132.txt
dhcpd.conf.sample                     draft-ietf-dhc-failover-07.txt  RELNOTES     rfc2485.txt
IANA-arp-parameters                   rfc1542.txt  rfc2489.txt
draft-ietf-dhc-authentication-14.txt  ja_JP.eucJP                     rfc2131.txt  rfc951.txt
[root@EmployServer dhcp-3.0.5]# cp dhcpd.conf.sample /etc/dhcpd.conf
cp：是否覆盖“/etc/dhcpd.conf”? y
[root@EmployServer dhcp-3.0.5]# vi /etc/dhcpd.conf
ddns-update-style interim;
ignore client-updates;

subnet 192.168.0.0 netmask 255.255.255.0 {

# --- default gateway
        option routers                  192.168.0.1;
        option subnet-mask              255.255.255.0;

        option nis-domain               "domain.org";
        option domain-name              "domain.org";
        option domain-name-servers      192.168.1.1;

        option time-offset              -18000; # Eastern Standard Time
#       option ntp-servers              192.168.1.1;
#       option netbios-name-servers     192.168.1.1;
# --- Selects point-to-point node (default is hybrid). Don't change this unless
# -- you understand Netbios very well
#       option netbios-node-type 2;

        range dynamic-bootp 192.168.0.128 192.168.0.254;
        default-lease-time 21600;
        max-lease-time 43200;
"/etc/dhcpd.conf" 31L, 852C
---------------------------------------------------------
下面要修改一下配置文件，尽量按照原来格式修改，千万要小心。
修改后的内容如下：
-------------------------------------------
[root@EmployServer dhcp-3.0.5]# vi /etc/dhcpd.conf
ddns-update-style interim;
ignore client-updates;

subnet 192.168.120.0 netmask 255.255.255.0 {------子网及掩码

# --- default gateway
        option routers                  192.168.120.1;--- 网关（路由器）
        option subnet-mask              255.255.255.0;---子网掩码

        option nis-domain               "domain.org";
        option domain-name              "domain.org";
        option domain-name-servers      192.168.1.1;

        option time-offset              -18000; # Eastern Standard Time
#       option ntp-servers              192.168.1.1;
#       option netbios-name-servers     192.168.1.1;
# --- Selects point-to-point node (default is hybrid). Don't change this unless
# -- you understand Netbios very well
#       option netbios-node-type 2;

        range dynamic-bootp 192.168.120.128 192.168.120.254;-------动态分配的IP区域
        default-lease-time 21600;
        max-lease-time 43200;
        next-server 192.168.120.36;-----很重，指出引导文件所在的服务器IP。
        filename "/pxelinux.0";-----指出引导文件名称。

        # we want the nameserver to appear at a fixed address
"/etc/dhcpd.conf" 33L, 913C written
----------------------------------------------------------------------------------
4、启动dhcp服务，并设置其开机启动，启动服务之前最好确保机器在单独网络中，以免造成dhcp冲突。

[root@EmployServer dhcp-3.0.5]# service dhcpd start
启动 dhcpd：                                               [确定]

[root@EmployServer dhcp-3.0.5]# chkconfig --list dhcpd |grep dhcpd
dhcpd           0:关闭  1:关闭  2:关闭  3:启用  4:启用  5:启用  6:关闭


四、组建pxe环境

1、验证syslinux是否已经安装
[root@EmployServer ks]# yum list installed | grep syslinux
syslinux.i386                           3.11-4                         installed

centos5.5默认已经安装了syslinux包


2、复制相关文件到tftp-server的输出根目录 /tftpboot

[root@EmployServer ks]# cp /usr/lib/syslinux/pxelinux.0 /tftpboot
[root@EmployServer ks]# cp /usr/lib/syslinux/menu.c32 /tftpboot
[root@EmployServer ks]# cp /usr/lib/syslinux/memdisk /tftpboot
[root@EmployServer ks]# cp /usr/lib/syslinux/mboot.c32 /tftpboot
[root@EmployServer ks]# cp /usr/lib/syslinux/chain.c32 /tftpboot
[root@EmployServer ks]#
[root@EmployServer ks]# ls /tftpboot/
chain.c32  mboot.c32  memdisk  menu.c32  pxelinux.0

3、复制系统盘的所有内容到共享目录 /media/centos5.5

[root@EmployServer dev]# mount /dev/cdrom /mnt/cdrom
[root@EmployServer dev]# cp -rv /mnt/cdrom/* /media/centos5.5/

4、复制系统内核和rmdisk驱动以及启动菜单所需要的文件到/tftpboot

[root@EmployServer pxeboot]# cd /media/centos5.5/isolinux

[root@EmployServer pxeboot]# cp * /tftpboot/

5、创建pxelinux.0的默认配置文件

[root@EmployServer dhcp-3.0.5]# cd /tftpboot/

[root@EmployServer tftpboot]# mkdir pxelinux.cfg
[root@EmployServer tftpboot]# cp isolinux.cfg pxelinux.cfg/default


6、关闭防火墙

[root@EmployServer tftpboot]# service iptables stop

至此所有设置完毕，可以网络安装了