1.   实施步骤

1.1.软件安装
1.2.配置修改
1.3.服务启动
1.4.系统安装
 
2.   软件安装
2.1.yum install tftp-server
2.2.yum install dhcp
 
3.   服务配置修改
3.1.配置 tftp服务
#vi /etc/xinet.d/tftp
-----------------------------------------------------------------------
service tftp
{
        socket_type             = dgram
        protocol                = udp
        wait                    = yes
        user                    = root
        server                  = /usr/sbin/in.tftpd
        server_args             = -u nobody -s /tftpboot
        disable                 = no
        per_source              = 11
        cps                     = 100 2
        flags                   = IPv4
        }
-----------------------------------------------------------------------
3.2.配置 dhcp
#cp /usr/share/doc/dhcp-3.0.5/dhcpd.conf.sample /etc/dhcpd.conf
#vim /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      192.168.0.2;
 
        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 192.168.0.10 192.168.0.29;
        default-lease-time 21600;
        max-lease-time 43200;
        next-server 192.168.0.2;
        filename "/pxelinux.0";
 
        # we want the nameserver to appear at a fixed address
        host ns {
                next-server marvin.redhat.com;
                 hardware ethernet 12:34:56:78:AB:CD;
                fixed-address 207.175.42.254;
        }
}
 
-----------------------------------------------------------------------

配置项
说明
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 255.255.255.0
/*作用域 */
option routers      192.168.0.1;  
网关的 IP地址
range dynamic-bootp 192.168.0.10 192.168.0.50;
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 192.168.0.2; 
/*TFTPServer的 IP*/
filename "/pxelinux.0";   
/*Bootstrap文件 */

 
3.3.配置 PXE
3.3.1.   创建目录
#mkdir /var/netoot
3.3.2.   复制文件
#mount /dev/cdrom /media
#cp –rf /mediar/* /var/netboot    //复制操作系统安装文件
#mkdir /tftpboot
#cp /var/netboot/isolinux/* /tftpboot
#mkdir /tftpboot/pxelinux.cfg
#mv /tftpboot/isolinux.cfg /tftpboot/pxelinux.cfg/default
3.4.配置 NFS服务
#vi /etc/exports
--------------------------------------------------------------------
/var/netboot     *(ro,sync)
/tftpboot        *(ro,sync)
--------------------------------------------------------------------
#exportfs –a       //导出共享目录
4.   服务启动
#service nfs start
#service dhcpd start
#service xinetd start
 
#chkconfig –level 345 xinetd on
#chkconfig –level 345 tftp on
5.   系统安装
5.1.设置计算机从 PXE启动
5.2.安装系统