[root@192 ~]# vi /etc/sysconfig/selinux

# This file controls the state of SELinux on the system.
# SELINUX= can take one of these three values:
#     enforcing - SELinux security policy is enforced.
#     permissive - SELinux prints warnings instead of enforcing.
#     disabled - No SELinux policy is loaded.
SELINUX=disabled   ###修改为 :SELINUX=disabled
# SELINUXTYPE= can take one of three values:
#     targeted - Targeted processes are protected,
#     minimum - Modification of targeted policy. Only selected processes are protected.
#     mls - Multi Level Security protection.
SELINUXTYPE=targeted

三、操作步骤

1.安装dhcp、tftp、http、syslinux

2.配置dhcp服务

yum -y install dhcp

安装后，?DHCP?服务的主配置文件为?/etc/dhcp/dhcp.conf?，我们可以修改配置文件以实现为客户端分配网络参数。

copy样例文件到/etc/dhcp/dhcp.conf，如下操作：

[root@192 ~]# cd /etc/dhcp/
[root@192 dhcp]# ls
dhclient.d  dhclient-exit-hooks.d  dhcpd6.conf  dhcpd.conf  scripts
[root@192 dhcp]# cp /usr/share/doc/dhcp-4.2.5/dhcpd.conf.example ./

修改配置文件?：??vim /etc/dhcp/dhcpd.conf 如下修改：

[root@192 dhcp]# cat dhcpd.conf
subnet 192.168.150.0 netmask 255.255.255.0 {
        range 192.168.150.10 192.168.150.100;
        default-lease-time 3600;
        filename "pxelinux.0";
        next-server 192.168.150.141;
}

重启服务

systemctl restart dhcpd

3.配置tftp服务器

TFTP?服务为客户端提供一种简单的文件共享，非常适用于传输小且简单的?PXE?启动文件

yum install?tftp-server -y

编辑/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 /var/lib/tftpboot
        disable                 = no
        per_source              = 11
        cps                     = 100 2
        flags                   = IPv4
}

disable?=?no?#把原来的yes改成no

改完重启服务

systemctl restart tftp?

?4.拷贝PXE服务器的相关文件到/var/lib/tftpboot（tftp的根目录）

安装syslinux并拷贝pxelinux.0文件到TFTP服务器

yum install syslinux?-y?#通过安装syslinux获取引导文件

cp?/usr/share/syslinux/pxelinux.0 /var/lib/tftpboot/? ? ##引导文件

cp?/usr/share/syslinux/menu.c32??/var/lib/tftpboot/? ? ##菜单文件

将镜像放在光驱并运行如下命令，从光盘中复制启动镜像文件和启动配置文件到TFTP共享目录

mount?-o?loop?-t?iso9660 /dev/sr0 /media?

将镜像中的相关文件复制到tftp根目录

cp? /media/isolinux/vmlinuz??/var/lib/tftpboot/? ?##安装引导文件1

cp? /media/isolinux/initrd.img? /var/lib/tftpboot/? ?##安装引导文件2

在tftpboot目录下创建目录pxelinux.cfg

cd /var/lib/tftpboot/
mkdir pxelinux.cfg
cd pxelinux.cfg

创建如下default文件?：

default menu.c32     
timeout 300
prompt 0

label 1
menu label ^1) Install CentOS7
menu default
kernel vmlinuz
append initrd=initrd.img method=http://192.168.150.141/CentOS7 ks=http://192.168.150.141/ks.cfg

5.配置http服务器

yum install httpd -y

在/var/www/html/目录下创建目录CentOS7?

[root@192 pxelinux.cfg]# cd /var/www/html/
[root@192 html]# mkdir CentOS7

?将/dev/cdrom挂载在该目录下：

?mount /dev/cdrom /var/www/html/CentOS7/

保证能看到安装光盘的内容：http://192.168.150.141/CentOS7/

6.配置ks.cfg文件

先看模板文件：

[root@192 ~]# ll
total 4
-rw-------. 1 root root 1492 Sep 14 08:02 anaconda-ks.cfg

cp anaconda-ks.cfg ?/var/www/html/

?然后改名为ks.cfg

mv anaconda-ks.cfg ks.cfg

??保证能看到安装脚本文件的信息：http://192.168.150.141/ks.cfg

chmod +r ks.cfg

?修改里面内容：

开头修改部分：

#version=DEVEL
# System authorization information
auth --enableshadow --passalgo=sha512
# Use CDROM installation media
#cdrom
url --url http://192.168.150.141/CentOS7  ###第一处修改
# Use graphical install
#graphical             ###第二处修改
text           ###第三次修改

中间修改部分：

# Partition clearing information
#clearpart --none --initlabel    ###第一处修改
clearpart --all --initlabel        ###第二处修改
# Disk partitioning information
part /boot --fstype="xfs" --ondisk=sda --size=500
part pv.253 --fstype="lvmpv" --ondisk=sda --size=19979
volgroup centos --pesize=4096 pv.253
logvol /  --fstype="xfs" --size=17927 --name=root --vgname=centos
logvol swap  --fstype="swap" --size=2048 --name=swap --vgname=centos

结尾处修改：

%anaconda
pwpolicy root --minlen=6 --minquality=1 --notstrict --nochanges --notempty
pwpolicy user --minlen=6 --minquality=1 --notstrict --nochanges --emptyok
pwpolicy luks --minlen=6 --minquality=1 --notstrict --nochanges --notempty
%end

reboot  ###加个reboot