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一、准备工作

1、关闭防火墙和selinux

 systemctl stop firewalld  &&  systemctl disable firewalldsetenforce 0

2、配置静态ip

需要在dhcp里面填写tftp配置，所以需要固定ip

二、dhcp安装配置

作用：给客户端提供ip地址，并告诉客户端tftp地址

$ yum install -y dhcp#默认dhcp配置文件为空
$ cp /usr/share/doc/dhcp-4.2.5/dhcpd.conf.example /etc/dhcp/dhcpd.conf#修改dhcp配置，仅列出修改部分，未修改部分保持默认即可
next-server 172.13.11.222;   #tftp-server地址
filename "pxelinux.0";      #引导文件名称subnet 172.13.11.0 netmask 255.255.255.0 {range 172.13.11.200 172.13.11.222;option domain-name-servers 114.114.114.114;option domain-name "example.com";option routers 172.13.11.254;option broadcast-address 172.13.11.255;default-lease-time 600;max-lease-time 7200;
}$ systemctl start dhcpd && systemctl enable dhcpd

三、安装tftp-server和http

$ yum install -y tftp-server xinted $ cat /etc/xinetd.d/tftp
disable                 = no     #将yes改为no$ systemctl start xinetd &&  systemctl enable xinetd$ yum install httpd -y
$ systemctl start httpd && systemctl enable httpd
$ mkdir /var/www/html/pub/   #用来存放系统文件
$ mkdir /var/www/html/ks/    #用来存放ks自动应答文件

四、获取系统和引导文件

4.1、准备文件

yum install syslinux -ymkdir /var/lib/tftpboot/pxelinux.cfg
cp /usr/share/syslinux/pxelinux.0 /var/lib/tftpboot/pxelinux.cfg/default#挂载光盘文件
$ cat /etc/fstab
/dev/cdrom  /var/www/html/pub iso9660 defaults        0 0$ df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/sda3        40G  1.6G   39G   4% /
devtmpfs        1.9G     0  1.9G   0% /dev
tmpfs           1.9G     0  1.9G   0% /dev/shm
tmpfs           1.9G  8.6M  1.9G   1% /run
tmpfs           1.9G     0  1.9G   0% /sys/fs/cgroup
/dev/sr0        918M  918M     0 100% /var/www/html/pub
...$ cp /var/www/html/pub/isolinux/* /var/lib/tftpboot/

4.2、修改default的配置

$ cat /var/lib/tftpboot/pxelinux.cfg/defaultlabel minimenu label ^Install mini CentOS 7.6menu defaultkernel vmlinuzappend initrd=initrd.img ks=http://10.139.8.222/ks/ks.cfg

五、准备ks.cfg自动应答文件

#检查ks语法是否正确
ksvalidator ks.cfg  

#platform=x86, AMD64, or Intel EM64T
#version=DEVEL
# Install OS instead of upgrade
install
# Keyboard layouts
keyboard 'us'
# Root password
rootpw --iscrypted $1$9DaKYCjW$zHgzt87pRI6u0miUdWbvh1
# System language
lang en_US
# System authorization information
auth  --useshadow  --passalgo=sha512
# Use graphical install
graphical
firstboot --disable
# SELinux configuration
selinux --disabled# Firewall configuration
firewall --disabled
# Network information
network  --bootproto=static --device=eth0 --gateway=172.13.11.254 --ip=172.13.11.200 --nameserver=114.114.114.114 --netmask=255.255.255.0
# Reboot after installation
reboot
# System timezone
timezone Asia/Shanghai
# Use network installation
url --url="http://172.13.11.222/pub"
# System bootloader configuration
bootloader --location=mbr
# Clear the Master Boot Record
zerombr
# Partition clearing information
clearpart --all --initlabel
# Disk partitioning information
part /boot --fstype="xfs" --size=200
part /home --fstype="xfs" --size=1024
part / --fstype="xfs" --grow --size=1
%packages
@^minimal
@core
chrony
kexec-tools%end
%addon com_redhat_kdump --enable --reserve-mb='auto'%end