以下配置文档亲手配置有效，其中为了省事关闭了selinux和防火墙。
yum -y install dhcp tftp-server syslinux httpd xinetd
systemctl disable firewalld
vi /etc/selinux/config
disabled selinux
systemctl enable dhcpd
systemctl enable httpd
systemctl enable tftp
vi /etc/dhcp/dhcpd.conf
allow booting;
allow bootp;
ddns-update-style interim;
ignore client-updates;
subnet 192.168.1.0 netmask 255.255.255.0 {
option subnet-mask 255.255.255.0;
option domain-name-servers 192.168.1.10;
range dynamic-bootp 192.168.1.100 192.168.1.200;
default-lease-time 21600;
max-lease-time 43200;
next-server 192.168.1.10;
filename "/pxelinux.0";
}
option option-128 code 128 = string;
option option-129 code 129 = text;
systemctl start dhcpd
//下午继续
systemctl disable firewalld
vi /etc/xinetd.d/tftp and change disable to 'no'
disable = no
systemctl restart xinetd
mount /dev/cdrom /media/cdrom
cd /var/lib/tftpboot
cp /usr/share/syslinux/pxelinux.0 .
cp /media/cdrom/images/pxeboot/{vmlinuz,initrd.img} .
cp /media/cdrom/isolinux/{vesamenu.c32,boot.msg} .
mkdir pxelinux.cfg
cp /media/cdrom/isolinux/isolinux.cfg pxelinux.cfg/default
vi pxelinux.cfg/default
1 default linux
61 label linux
62 menu label ^Install CentOS Linux 7.0
63 kernel vmlinuz
64 append initrd=initrd.img inst.stage2=http://192.168.1.10/inst/ ks=http://192.168.10.10/inst/ks.cfg
ks.cfg
//只要指定url就可以了
url --url http://192.168.1.10/inst/
**************************
直接把ks内容写到default无效，找不到安装源，后来只好把他写入到ks.cfg ，好神奇，明明是放到同样的
http://192.168.1.10/inst 目录下，但是却可以找到了。