How to automatically deploy Linux system using PXE

. `vim dvd.repo
	[development] #Define the later package selection name=centos
	baseurl=file:///media
	gpgcheck=0
	enabled=1`

cp /usr/share/doc/dhcp-4.2.5/dhcpd.conf.example /etc/dhcp/dhcpd.conf #Copy the template and overwrite the conf file

vim /etc/dhcp/dhcpd.conf #Choose between global configuration and sub-configuration.
   Global configuration# option definitions common to all supported networks...
  7 option domain-name "example.org";
  8 option domain-name-servers ns1.example.org, ns2.example.org;
  9 
 10 default-lease-time 600;
 11 max-lease-time 7200;
 12 next-server 192.168.100.10; #Specify where the tftpserver is 13 filename "/pxelinux.0"; #Network boot program file # Sub-configuration A slightly different configuration for an internal subnet.
 47 #Subnet configuration 48 subnet 192.168.100.0 netmask 255.255.255.0 {
 49 range 192.168.100.11 192.168.100.30; #DHCP address pool range 50 option domain-name-servers 192.168.100.2; #DNS address (can be set)
 51 option domain-name "example.com"; #Domain name address52 option routers 192.168.100.1; #Gateway address53 option broadcast-address 192.168.100.255; #Broadcast address54 default-lease-time 600; #How long does the IP obtained during the lease period survive55 max-lease-time 7200; #When the lease period expires, it can still be used if it is still available, otherwise it will be automatically recycled56 }

[root@pxeserver ~]# vim /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 ##Change yes to no
        per_source = 11
        cps = 100 2
        flags = IPv4
}

yum provides "*/pxelinux.0" ##Find which package this file belongs to yum install -y syslinux #Install syslinux
cp /usr/share/syslinux/pxelinux.0 /var/lib/tftpboot/ #Copy the pxelinux.0 file to the tftp root directory mkdir -p /var/lib/tftpboot/pxelinux.cfg #Place the default configuration file cp /media/isolinux/isolinux.cfg /var/lib/tftpboot/pxelinux.cfg/default ##Boot file cp to the pxeLinux.cfg directory cp /media/isolinux/* /var/lib/tftpboot/ #cpPlace the iso file and read it by default (the installation menu will be displayed)
There is no system configuration default file menu separator # insert an empty line
menu separator # insert an empty line
 
label linux
  menu label ^Install CentOS 7.5 #Menu directory kernel vmlinuz #Kernel file append initrd=initrd.img ks=http://192.168.100.10/ks/ks.cfg

yum install -y httpd
systemctl start httpd
systemctl enable httpd
mkdir -p /var/www/html/centos
cp -rfv /media/* /var/www/html/centos/
[root@pxe-server ~]# cat /etc/yum.repos.d/dvd.repo 
[development] #Define the later selected package name=centos
baseurl=http://192.168.100.10/centos
gpgcheck=0
enabled=1

yum install -y system-config-kickstart
system-config-kickstart #Start