[root@Server~]# cd /etc/yum.repos.d/
[root@Server/etc/yum.repos.d]# ls
rivers.repo
[root@Server/etc/yum.repos.d]# mv rivers.repo rivers.repo.bak
[root@Server/etc/yum.repos.d]# vim dvd.repo
[development]
name=Centos7.6
baseurl=file:///mnt
enabled=1
gpgcheck=0

[root@Server~]# mount /dev/cdrom /mnt/
mount: /dev/sr0 is write-protected, mounting read-only
[root@Server~]# 

[root@Server~]# yum clean all
Loaded plugins: fastestmirror
Cleaning repos: development
Other repos take up 137 M of disk space (use --verbose for details)
[root@Server~]# 

[root@Server~]# systemctl disable firewalld --now
[root@Server~]#setenforce 0

# selinux 開機(jī)才生效，setenforce 0 臨時關(guān)閉

[root@Server~]# yum -y install dhcp tftp-server xinetd
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
Resolving Dependencies
--> Running transaction check
---> Package dhcp.x86_64 12:4.2.5-68.el7.centos.1 will be installed
……

# 1.進(jìn)入 dhcp目錄
[root@Server~]# cd /etc/dhcp/
[root@Server/etc/dhcp]# ls
dhclient.d             dhcpd6.conf  scripts
dhclient-exit-hooks.d  dhcpd.conf

# 2.查看默認(rèn)配置文件，是空的，但是/usr/share/doc/dhcp*/目錄下有配置模板，我們可以拷貝
[root@Server/etc/dhcp]# cat dhcpd.conf 
#
# DHCP Server Configuration file.
#   see /usr/share/doc/dhcp*/dhcpd.conf.example
#   see dhcpd.conf(5) man page
#
[root@Server/etc/dhcp]# 

# 3.拷貝dhcpd 配置模板文件
[root@Server/etc/dhcp]# cp /usr/share/doc/dhcp-4.2.5/dhcpd.conf.example /etc/dhcp/dhcpd.conf
cp: overwrite ‘/etc/dhcp/dhcpd.conf'? y


# 4. 修改dhcp 文件，(這里可以不用拷貝配置文件，直接復(fù)制下面一段。subnet--filename)

# A slightly different configuration for an internal subnet.
subnet 10.0.0.0 netmask 255.255.255.0 {            
  range 10.0.0.120 10.0.0.200;
  option domain-name-servers 10.0.0.5, 10.0.0.6;
  option domain-name "example.com";
  option routers 10.0.0.254;
  option broadcast-address 10.0.0.255;
  default-lease-time 600;
  max-lease-time 7200;
  next-server 10.0.0.100;
  filename "pxelinux.0";

  
}
   subnet 10.0.0.0 netmask 255.255.255.0 #宣告網(wǎng)段
     range 10.0.0.120 10.0.0.200;  #分配地址范圍
     option domain-name-servers：  #dns配置，正常公司會有2個DNS我這里隨意配的
     option routers 10.0.0.254; # 設(shè)置網(wǎng)關(guān)的
     option broadcast-address 10.0.0.255; # 設(shè)置廣播地址
     default-lease-time 600;  # 默認(rèn)租約時間，它的單位為秒
     max-lease-time 7200;    #最大租約時間，它的單位為秒
     next-server 10.0.0.100;  # tftp-server IP地址
     filename "/pxelinux.0"; # 網(wǎng)絡(luò)啟動程序，(網(wǎng)絡(luò)引導(dǎo))

# 5. 啟動dhcp 服務(wù)器，
[root@Server/etc/dhcp]# systemctl enable dhcpd
Created symlink from /etc/systemd/system/multi-user.target.wants/dhcpd.service to /usr/lib/systemd/system/dhcpd.service.
[root@Server/etc/dhcp]# systemctl start dhcpd
[root@Server/etc/dhcp]#
[root@Server/etc/dhcp]# netstat -lantup|grep :67
udp        0      0 0.0.0.0:67              0.0.0.0:*                           8503/dhcpd          
[root@Server/etc/dhcp]# 
[root@Server/etc/dhcp]# cd
[root@Server~]#


@補(bǔ)充：如果全局配置了，子配置沒配置，那么將讀取全局設(shè)置
	  如果全局配置了，子的也配置了，那么將以自配置為準(zhǔn)。

# 1.修改tftp配置文件
[root@Server~]# vim /etc/xinetd.d/tftp 
將  disable = no 改為 yes

#重啟 xinetd
[root@Server~]# systemctl restart xinetd.service
[root@Server~]# netstat -lntup|grep :69
udp        0      0 0.0.0.0:69              0.0.0.0:*                           9071/xinetd         
[root@Server~]# 

# 1.查找 pxelinux.0文件是那個包提供的
[root@Server~]# yum provides "*/pxelinux.0"
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
syslinux-4.05-15.el7.x86_64 : Simple kernel loader
     ...: which boots from a FAT filesystem
Repo        : development
Matched from:
Filename    : /usr/share/syslinux/pxelinux.0



syslinux-tftpboot-4.05-15.el7.noarch : SYSLINUX
     ...: modules in /var/lib/tftpboot, available for
     ...: network booting
Repo        : development
Matched from:
Filename    : /var/lib/tftpboot/pxelinux.0



# 2.安裝syslinux包，然候拷貝pxelinux.0文件到 tftp-server目錄
[root@Server~]# yum -y install syslinux

[root@Server~]# rpm -ql syslinux|grep pxe
/usr/share/doc/syslinux-4.05/pxelinux.txt
/usr/share/syslinux/gpxecmd.c32
/usr/share/syslinux/gpxelinux.0
/usr/share/syslinux/gpxelinuxk.0
/usr/share/syslinux/pxechain.com
/usr/share/syslinux/pxelinux.0
[root@Server~]# 

# 3. 拷貝pxelinux.0 文件到 tftp-server 目錄
[root@Server~]# cp /usr/share/syslinux/pxelinux.0 /var/lib/tftpboot/
[root@Server/var/lib/tftpboot]# ls
pxelinux.0

# 4.創(chuàng)建一個目錄，用來放啟動配置文件 default的
[root@Server/var/lib/tftpboot]# mkdir pxelinux.cfg
[root@Server/var/lib/tftpboot]# ls
pxelinux.cfg  pxelinux.0
[root@Server/var/lib/tftpboot]# cd pxelinux.cfg
[root@Server/var/lib/tftpboot/pxe.cfg]# pwd
/var/lib/tftpboot/pxelinux.cfg

# 5.將 /mnt/isolinux/目錄下面的所有文件都考到 /var/lib/tftpboot下面
[root@Server/var/lib/tftpboot]# cd --
[root@Server~]# cd /mnt/isolinux/
[root@Server/mnt/isolinux]# cp -a isolinux.cfg  /var/lib/tftpboot/pxelinux.cfg/default
[root@Server/mnt/isolinux]#cp * /var/lib/tftpboot/

[root@Server/etc/yum.repos.d]#  cd --

# 1. 安裝system-config-kickstart
[root@Server~]# yum -y install system-config-kickstart
已加載插件：fastestmirror, langpacks
Loading mirror speeds from cached hostfile
……

#2. 啟動界面，配置ks.cfg
[root@Server~]# system-config-kickstart 
詳解界面如下：

# 1. 安裝httpd
[root@Server ~]# yum -y install httpd
已加載插件：fastestmirror, langpacks
Loading mirror speeds from cached hostfile
……
# 2.設(shè)置開啟自動、啟動服務(wù)
[root@Server ~]# systemctl enable httpd
[root@Server ~]# systemctl start httpd

#3. 創(chuàng)建 目錄
[root@Server ~]# cd /var/www/html
[root@Server/var/www/html]# mkdir ks.cfg 
[root@Server/var/www/html]# mkdir pub

# 4.修改yum 源，將本地改為http
[root@Server/var/www/html]# cd
[root@Server~]# cat /etc/yum.repos.d/dvd.repo
[development]
name=rhce7
baseurl=http://10.0.0.100/pub
enabled=1
gpgcheck=0
[root@Server~]# 

# 1. 在末尾添加以下一條信息。
[root@Server~]# vim /etc/fstab 
/dev/cdrom       /var/www/html/pub         iso9660                 defaults,loop 0 0
[root@Server~]# tail -1 /etc/fstab 
/dev/cdrom       /var/www/html/pub         iso9660                 defaults,loop 0 0
[root@Server~]# 

# 2.掛載鏡像
[root@Server~]# mount -a

# 3.用火狐瀏覽器訪問下，如果可以訪問，則說明http 鏡像源沒有問題
[root@Server~]# firefox http://10.0.0.100/pub &


@ 7版本上，模式可以識別loop,defaults,loop 后面的loop可以省略

# 1.將我們保存在root目錄中的cfg移動到 /var/www/html/ks.cfg/
[root@Server~]# mv ks6.cfg /var/www/html/ks.cfg/
[root@Server/var/www/html/ks.cfg]# ls
ks6.cfg 
[root@Server/var/www/html/ks.cfg]# 

[root@Server~]# cd /var/lib/tftpboot/pxelinux.cfg/
[root@Server/var/lib/tftpboot/pxelinux.cfg]# ls
default

# 1.編寫default文件，此時在原本的label linux 添加以下內(nèi)容，
# 并刪除label check里面的 menu defalut(默認(rèn)啟動方式，設(shè)置了，就不需要選擇，默認(rèn)啟動選項)

[root@Server/var/lib/tftpboot/pxelinux.cfg]# vim default 

label rhce7
  menu label ^Install rhce7
  menu default
  kernel vmlinuz
  append initrd=initrd.img ks=http://10.0.0.100/ks.cfg/ks6.cfg

# 2.可以修改下默認(rèn)的時間，默認(rèn)是 600(單位是600秒的十分之一，就是60s)
# 這里我設(shè)置60,就是6s
timeout 60

-------------------
參數(shù)介紹
efault vesamenu.c32    # 這是必須項，或者使用menu.c32

timeout 60             # 超時等待時間，60秒內(nèi)不操作將自動選擇默認(rèn)的菜單來加載

display boot.msg       # 這是為選項提供一些說明的文件

# Clear the screen when exiting the menu, instead of leaving the menu displayed.
# For vesamenu, this means the graphical background is still displayed without
# the menu itself for as long as the screen remains in graphics mode.
menu clear
menu background splash.png      # 背景圖片
menu title CentOS 7             # 大標(biāo)題
menu vshift 8

……
label linux
  menu label ^Install CentOS 7   # 菜單文字
  kernel vmlinuz        # 內(nèi)核文件路徑，注意相對路徑是從tftp的根路徑/tftpboot開始的
  append initrd=initrd.img inst.stage2=hd:LABEL=CentOS\x207\x20x86_64 quiet  
  # 內(nèi)核啟動選項，其中包括initrd的路徑，同樣要改為"ks=http://10.0.0.100/ks.cfg/ks6.cfg"
   
  menu default          # menu default表示開機(jī)時光標(biāo)一開始默認(rèn)停留在此label上
# 一般pxe環(huán)境下此路徑直接指向系統(tǒng)安裝文件的路徑，具體做法見下文示例

# utilities submenu          # 子菜單項的設(shè)置方法
  menu begin ^Troubleshooting
  menu title Troubleshooting

%pre
 parted -s /dev/sdb mklabel gpt
%end