VMware implements the detailed process of PXE+kickstart unattended installation of Centos7 system

[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 took up 137 M of disk space (use --verbose for details)
[root@Server~]# 

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

# selinux takes effect only after booting, setenforce 0 temporarily disables

[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. Enter the dhcp directory [root@Server~]# cd /etc/dhcp/
[root@Server/etc/dhcp]# ls
dhclient.d dhcpd6.conf scripts
dhclient-exit-hooks.d dhcpd.conf

# 2. Check the default configuration file, it is empty, but there is a configuration template in the /usr/share/doc/dhcp*/ directory, we can copy it [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. Copy the dhcpd configuration template file [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. Modify the dhcp file. (You don’t need to copy the configuration file here. Just copy the following paragraph. 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 #declare network segmentrange 10.0.0.120 10.0.0.200; #allocate address rangeoption domain-name-servers： #dns configuration, a normal company will have 2 DNSs, I randomly configure them hereoption routers 10.0.0.254; #set gatewayoption broadcast-address 10.0.0.255; #set broadcast addressdefault-lease-time 600; #default lease time, its unit is secondsmax-lease-time 7200; #maximum lease time, its unit is secondsnext-server 10.0.0.100; #tftp-server IP addressfilename "/pxelinux.0"; #network startup program, (network boot)

# 5. Start the dhcp server.
[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~]#


@Supplement: If the global configuration is configured and the sub-configuration is not configured, the global settings will be read. If the global configuration is configured and the sub-configuration is also configured, the self-configuration will prevail.

# 1. Modify the tftp configuration file [root@Server~]# vim /etc/xinetd.d/tftp 
Change disable = no to yes

#Restart 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. Find which package provides the pxelinux.0 file [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. Install the syslinux package, and then copy the pxelinux.0 file to the tftp-server directory [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. Copy the pxelinux.0 file to the tftp-server directory [root@Server~]# cp /usr/share/syslinux/pxelinux.0 /var/lib/tftpboot/
[root@Server/var/lib/tftpboot]# ls
pxelinux.0

# 4. Create a directory to store the startup configuration file default [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. Move all files under the /mnt/isolinux/ directory to /var/lib/tftpboot [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. Install system-config-kickstart
[root@Server~]# yum -y install system-config-kickstart
Loaded plugins: fastestmirror, langpacks
Loading mirror speeds from cached hostfile
…

#2. Start the interface and configure ks.cfg
[root@Server~]# system-config-kickstart 
The detailed interface is as follows:

# 1. Install httpd
[root@Server ~]# yum -y install httpd
Loaded plugins: fastestmirror, langpacks
Loading mirror speeds from cached hostfile
…
# 2. Set to automatically start and start the service [root@Server ~]# systemctl enable httpd
[root@Server ~]# systemctl start httpd

#3. Create a directory [root@Server ~]# cd /var/www/html
[root@Server/var/www/html]# mkdir ks.cfg 
[root@Server/var/www/html]# mkdir pub

# 4. Modify the yum source and change the local source to 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. Add the following information at the end.
[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. Mount the image [root@Server~]# mount -a

# 3. Use Firefox to access it. If you can access it, it means that there is no problem with the http mirror source [root@Server~]# firefox http://10.0.0.100/pub &


@ In version 7, the pattern can recognize loop, defaults, loop. The loop after loop can be omitted.

# 1. Move the cfg we saved in the root directory to /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. Write the default file. Add the following content to the original label linux:
# And delete the menu default in label check (default startup mode, if set, no need to select, default startup option)

[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. You can modify the default time, the default is 600 (the unit is one tenth of 600 seconds, that is, 60s)
# Here I set 60, which means 6s
timeout 60

-------------------
Parameter introduction efault vesamenu.c32 # This is a required item, or use menu.c32

timeout 60 # Timeout waiting time. If no operation is performed within 60 seconds, the default menu will be automatically selected to load display boot.msg # This is a file that provides some instructions for the options. # 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 # Background image menu title CentOS 7 # Large title menu vshift 8

…
label linux
  menu label ^Install CentOS 7 # Menu text kernel vmlinuz # Kernel file path, note that the relative path starts from the root path of tftp/tftpboot append initrd=initrd.img inst.stage2=hd:LABEL=CentOS\x207\x20x86_64 quiet  
  # Kernel boot options, including the path to initrd, should also be changed to "ks=http://10.0.0.100/ks.cfg/ks6.cfg"
   
  menu default # menu default means that the cursor will be on this label by default when the computer is turned on. # In general, in a pxe environment, this path directly points to the path of the system installation file. For specific methods, see the example below. # utilities submenu # How to set submenu items menu begin ^Troubleshooting
  menu title Troubleshooting

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