远程安装系统过程：PXE网卡启动——DHCP服务器——获得IP——从TFTP上下载pxelinux.0、
vmlinuz、initrd——启动系统——通过PXElinux去nfs下载ks.cfg文件—–根据ks.cfg去nfs下载安装文件。
载RPM包及安装系统——完成安装
1． 搭建tftp,dhcpf服务器
#yum install tftp* dhcp*
#vim /etc/xinetd.d/tftp
1. service tftp
2. {

3. disable = no
4. socket_type = dgram
5. protocol = udp
6. wait = yes
7. user = root
8. server = /usr/sbin/in.tftpd
9. server_args = -u nobody -s /tftpboot
10. per_source = 11
11. cps = 100 2
12. flags = IPv4
13. }
需要修改1个地方
disable = no 修改为yes

#cp /usr/share/doc/dhcp-3.0.5/dhcpd.conf.sample /etc/dhcpd.conf
#vim /etc/dhcpd.conf （修改成如下）
ddns-update-style interim;
ignore client-updates;
next-server 192.168.0.100;
filename “pxelinux.0″;
authoritative;
allow booting;
allow bootp;
subnet 192.168.0.0 netmask 255.255.252.0
{
option routers 192.168.0.1;
option subnet-mask 255.255.252.0;
option domain-name “mapbar.com”;
option domain-name-servers 192.168.0.10;
range dynamic-bootp 192.168.0.100 192.168.0.200;
default-lease-time 21600;
max-lease-time 43200;
}
ddns-update-style interim; /*dhcp支持的dns动态更新方式*/
ignore client-updates; /*忽略客户端DNS动态更新*/
authoritative; /*授权*/
allow booting; /*支持PXE启动*/
allow bootp; /*支持boottp*/
subnet 192.168.0.0 netmask 255.255.252.0 /*作用域*/
option routers 192.168.0.1; 网关的IP地址
range dynamic-bootp 192.168.0.100 192.168.0.200; 分配给客户端的IP地址范围
default-lease-time 21600; /*租期，秒数*/
max-lease-time 43200; /*最大租期，秒数*/
next-server 192.168.0.100; /*TFTPServer的IP*/
filename “pxelinux.0″; /*Bootstrap文件*/
2.配置支持PXE
mount /dev/cdrom /mnt && mkdir /centosinstall && cp –rf /mnt/* /centosinstall &&
vi /etc/exports
/centosinstall *(rw,sync)
启动服务
service dhcpd start
service portmap start
service nfs start
mkdir /tftpboot tftp的根目录
cp /usr/lib/syslinux/pxelinux.0 /tftpboot
cp /mnt/images/pxeboot/{vmlinuz,initrd.img} /tftpboot
mkdir /tftpboot/pxelinux.cfg
cp /mnt/isolinux/isolinux.cfg pxelinux.cfg/default
vim /tftpboot/pxelinux.cfg/default （修改配置如下：）
default linux
prompt 1
timeout 600
display boot.msg
F1 boot.msg
F2 options.msg
F3 general.msg
F4 param.msg
F5 rescue.msg
label linux
kernel vmlinuz
append ks=nfs:192.168.0.100:/centosinstall/ks.cfg initrd=initrd.img (需要修改的地方)
label text
kernel vmlinuz
append initrd=initrd.img text
label ks
kernel vmlinuz
append ks initrd=initrd.img
label local
localboot 1
label memtest86
kernel memtest
append -
设置timeout 10 /*超时时间为10S */
3.生成ks.cfg安装配置文件（拷贝到提供安装的目录 /centosinstall目录）
设置权限 chmod o+wx /centosinstall/ks.cfg
可以根据/root/目录下的anaconda-ks.cfg文件修改需要的系统需求。
（注意、clearpart –all –initlabel #如果ks.cfg脚本中不添加该语句，将不能实现自动化安装）
nfs –server=NFS服务器ip –dir=光盘的位置 或 系统安装文件存放的位置
network –device eth0 –bootproto dhcp（使用DHCP来实现自动分配IP地址）
启动客户端，加电+插上网线，设置网卡启动，等待安装完毕即可。
重启系统就可以了。
以下为我的ks.cfg参考配置：
# Kickstart file automatically generated by anaconda.cfg
install
text
nfs –server=192.168.0.100 –dir=/centosinstall
key –skip
lang zh_CN.UTF-8
keyboard us
network –device eth0 –bootproto dhcp
rootpw fsdf@sdfsd123
firewall –disabled
authconfig –enableshadow –enablemd5
selinux –disabled
timezone Asia/Shanghai
bootloader –location=mbr –driveorder=sda –append=”rhgb quiet”
# The following is the partition information you requested
# Note that any partitions you deleted are not expressed
# here so unless you clear all partitions first, this is
# not guaranteed to work
clearpart –all –initlabel
part /boot –fstype ext3 –size=200
part swap –size=2000
part /software –fstype ext3 –size=20000
part / –fstype ext3 –size=30000
part /home –fstype ext3 –size=20000
part /webapps –fstype ext3 –size=1 –grow
%packages
@admin-tools
@base
@core
@development-libs
@development-tools
@editors
@system-tools
@base-x
keyutils
kexec-tools
trousers
fipscheck
device-mapper-multipath
imake
audit
xorg-x11-server-Xnest
xorg-x11-server-Xvf