linux使用pxe自动安装centos6和centos7
一、初始环境配置iptables -F （清空防火墙策略）
setenforce 0（将selinux当前关闭）http://s1.运维网.com/images/20180914/1536923608296246.png
systemctl disable firewalld.service(开机默认关闭防火墙)http://s1.运维网.com/images/20180914/1536923867801221.png
也可以设置下次开机不启动该服务，编辑selinux配置文件：vim /etc/selinux/config
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二、安装所需软件包
yum -y install httpd
yum -y install tftp-server
yum -y install syslinux
yum -y install system-config-kickstart（生成ks文件）
yum -y install dhcp (安装dhcp服务) 三、生成kickstart文件
因为在centos7上生成kickstart文件，所以需要提前修改下yum库，修改如下
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system-config-kickstarthttp://s1.运维网.com/images/20180914/1536924556215269.png
弹出以下界面（当前运行在xshell，需要运行x11图形化界面）
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最后保存文件，起名为kscenos6.cfg，重复执行一次，生成kscentos7.cfg，不同之处在于选择http路径
生成的文件保存在/root目录下
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让我们看一下这两个文件的关键处如图所示：
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四、配置http服务
mkdir -p /var/www/html/centos/{6,7} (在http指定目录下创建目录用以区分centos6系统和centos7系统)
mount /dev/sr0 /var/www/html/centos/6/ （将光盘挂载到指定目录中）
mount /dev/sr1 /var/www/html/centos/7/http://s1.运维网.com/images/20180914/1536927081475000.png
mkdir -p /var/www/html/kshttp://s1.运维网.com/images/20180914/1536927216198490.png
mv /root/kscentos6.cfg /var/www/html/ks
mv /root/kscentos7cfg /var/www/html/ks
mv ks centos http://s1.运维网.com/images/20180914/1536927297920213.png
systemctl restart httpd (启动httpd服务）http://s1.运维网.com/images/20180914/1536927360680521.png
测试http服务是否可用，在浏览器中输入192.168.230.131/centos 如下图所示
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五、配置dhcp服务
cp /usr/share/doc/dhcp-4.2.5/dhcpd.conf.example /etc/dhcp/dhcpd.conf（复制一份模板文件） http://s1.运维网.com/images/20180914/1536927854911279.png
vim /etc/dhcp/dhcpd.conf (当前的ip地址必须为静态IP地址，否则无法启动dncp服务）http://s1.运维网.com/images/20180914/1536928143491127.png
systemctl restart dhcpdhttp://s1.运维网.com/images/20180914/1536928575285395.png
六、配置pxe
cd /var/lib/tftpboot/ (进入tftp服务的指定目录）
mkdir centos{6,7}
cp /var/www/html/centos/6/isolinux/{vmlinuz,initrd.img} centos6/
cp /var/www/html/centos/7/isolinux/{vmlinuz,initrd.img} centos7/
cp /usr/share/syslinux/{pxelinux.0,menu.c32} . （pxe创建系统时所需要的文件）
mkdir pxelinux.cfg
cp /var/www/html/centos/7/isolinux/isolinux.cfg pxelinux.cfg/default（注意所有文件权限）http://s1.运维网.com/images/20180914/1536928903180347.png
vim pxelinux.cfg/defaulthttp://s1.运维网.com/images/20180914/1536929470286839.png
systemctl start tftp.socket （开启服务）
systemctl enable tftp.socket（开机自启动服务） 七、测试
创建新的虚拟机，进入Boot Menu界面，选择第四项
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任意选择一个系统进入
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