CentOS7自动化安装PXE方案

目的

无人值守批量安装CentOS7

安装条件

一台带有PXE协议支持NIC的待安装主机

一台存放安装文件的服务器，如NFS，HTTP或FTP服务器

Kickstart 生成的配置文件（ks.cfg）

DHCP服务器

TFTP服务器

HTTP服务器(Apache)

系统环境

服务器：CentOS Linux Release 7.3.1611

IP Address: 192.168.1.110/24

详细步骤

1、关闭SELinux和Firewalld

a）修改/etc/selinux/config，SELINUX的值改为disabled

# cat /etc/selinux/config

# This file controls the state of SELinux on the system.

# SELINUX= can take one of these three values:

# enforcing - SELinux security policy is enforced.

# permissive - SELinux prints warnings instead of enforcing.

# disabled - No SELinux policy is loaded.

#SELINUX=enforcing

SELINUX=disabled

   

# SELINUXTYPE= can take one of three two values:

# targeted - Targeted processes are protected,

# minimum - Modification of targeted policy. Only selected processes are protected.

# mls - Multi Level Security protection.

SELINUXTYPE=targeted

   

b）# systemctl stop firewalld

#systemctl disable firewalld

   

2、安装dhcp，tftp，http服务器，xinetd和system-config-kickstart

#yum -y install dhcp tftp-server http xinetd syslinux system-config-kickstart

3、下载CentOS7 光盘ISO文件到/usr/local/src下，并挂载到/mnt/cdrom目录下

# cd /usr/local/src

# wget http://mirrors.163.com/centos/7/isos/x86_64/CentOS-7-x86_64-DVD-1611.iso

# mkdir -p /mnt/cdrom

# mount -o loop CentOS-7-x86_64-DVD-1611.iso /mnt/cdrom

4、复制DVD ISO文件下所有内容到/var/www/html (Apache默认DocuementRoot目录)

#mkdir /var/www/html/CentOS-7

# cp -rf /mnt/cdrom/* /var/www/CentOS-7/

   

5、a)修改tftp服务的配置文件/etc/xinetd.d/tftp,将disable的值由yes改为no

service tftp

{

　　　　　socket_type　　　　　　　　　　　　　　　= dgram

　　　　　protocol　　　　　　　　　　　　　　　　 = udp

　　　　　wait　　　　　　　　　　　　　　　　　　 = yes

　　　　　user　　　　　　　　　　　　　　　　　　 = root

　　　　　server　　　　　　　　　　　　　　　　　 = /usr/sbin/in.tftpd

　　　　　server_args　　　　　　　　　　　　　　　= -s /var/lib/tftpboot

　　　　　disable　　　　　　　　　　　　　　　　 = no

　　　　　per_source　　　　　　　　　　　　　　　 = 11

　　　　　cps　　　　　　　　　　　　　　　　　　　= 100 2

　　　　　flags　　　　　　　　　　　　　　　　　　= IPv4

}

b)

# systemctl start xinetd

# systemctl enable xinetd

6、配置支持PXE的启动程序syslinux。syslinux是一个功能强大的引导加载程序，而且兼容各种介质。它的目的是简化首次安装Linux的时间，并建立修护或其它特殊用途的启动盘。pxlinux是syslinux的一个派生品,用于支持从网络启动，pxlinux.0 是pxelinux的引导程序。

a)拷贝PXE启动需要的文件给tftp服务器

# cd /var/lib/tftp

# cp /usr/share/syslinux/pxelinux.0 .

# cp /var/www/html/CentOS-7/images/pxeboot/{initrd.img, vmlinuz} .

# cp /var/www/html/isolinux/{vesamenu.c32, *.msg} .

# mkdir pxelinux.cfg

# cp /var/www/html/CentOS-7/isolinux/isolinux.cfg pxelinux.cfg/default

   

   

b)修改sysconfig配置文件default

第1行default vesamenu.c32 修改为default linux, 系统将不会显示启动菜单的选择界面，而是直接进入lable linux 的安装项进行安装

第2行修改为timeout 1, 不需等待用户选择菜单，直接进入引导

第64行修改为

append initrd=initrd.img inst.stage2=http://192.168.1/110/CentOS-7 inst.ks=http://192.168.1.110/ks/ks.cfg

   

/var/lib/tftpboot/pxelinux.cfg/default 文件内容实例：

[root@luxvm1 tftpboot]# cat pxelinux.cfg/default

#default vesamenu.c32

#default menu.c32

default linux

timeout 1

   

#display boot.msg

   

# 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

menu title CentOS Linux 7

menu vshift 8

menu rows 18

menu margin 8

#menu hidden

menu helpmsgrow 15

menu tabmsgrow 13

   

# Border Area

menu color border * #00000000 #00000000 none

   

# Selected item

menu color sel 0 #ffffffff #00000000 none

   

# Title bar

menu color title 0 #ff7ba3d0 #00000000 none

   

# Press [Tab] message

menu color tabmsg 0 #ff3a6496 #00000000 none

   

# Unselected menu item

menu color unsel 0 #84b8ffff #00000000 none

   

# Selected hotkey

menu color hotsel 0 #84b8ffff #00000000 none

   

# Unselected hotkey

menu color hotkey 0 #ffffffff #00000000 none

   

# Help text

menu color help 0 #ffffffff #00000000 none

   

# A scrollbar of some type? Not sure.

menu color scrollbar 0 #ffffffff #ff355594 none

   

# Timeout msg

menu color timeout 0 #ffffffff #00000000 none

menu color timeout_msg 0 #ffffffff #00000000 none

   

# Command prompt text

menu color cmdmark 0 #84b8ffff #00000000 none

menu color cmdline 0 #ffffffff #00000000 none

   

# Do not display the actual menu unless the user presses a key. All that is displayed is a timeout message.

   

menu tabmsg Press Tab for full configuration options on menu items.

   

menu separator # insert an empty line

menu separator # insert an empty line

   

label linux

menu label ^Install CentOS Linux 7

kernel vmlinuz

append initrd=initrd.img inst.stage2=http://192.168.1.110/CentOS-7 inst.ks=http://192.168.1.110/ks/ks.cfg quiet

   

label check

menu label Test this ^media & install CentOS Linux 7

kernel vmlinuz

menu default        

append initrd=initrd.img inst.stage2=http://192.168.1.110/CentOS-7 rd.live.check inst.ks=http://192.168.1.110/ks/ks.cfg quiet

   

menu separator # insert an empty line

   

# utilities submenu

menu begin ^Troubleshooting

menu title Troubleshooting

   

label vesa

menu indent count 5

menu label Install CentOS Linux 7 in ^basic graphics mode

text help

Try this option out if you're having trouble installing

CentOS Linux 7.

endtext

kernel vmlinuz

append initrd=initrd.img inst.stage2=http://192.168.1.110/CentOS-7 xdriver=vesa nomodeset inst.ks=http://192.168.1.110/ks/ks.cfg quiet

   

label rescue

menu indent count 5

menu label ^Rescue a CentOS Linux system

text help

If the system will not boot, this lets you access files

and edit config files to try to get it booting again.

endtext

kernel vmlinuz

append initrd=initrd.img inst.stage2=http://192.168.1.110/CentOS-7 rescue quiet

   

label memtest

menu label Run a ^memory test

text help

If your system is having issues, a problem with your

system's memory may be the cause. Use this utility to

see if the memory is working correctly.

endtext

kernel memtest

   

menu separator # insert an empty line

   

label local

menu label Boot from ^local drive

localboot 0xffff

   

menu separator # insert an empty line

menu separator # insert an empty line

   

label returntomain

menu label Return to ^main menu

menu exit

   

menu end

   

7、修改dhcp配置文件/etc/dhcp/dhcpd.conf

allow booting;

allow bootp;

ddns-update-style interim;

ignore client-updates;

next-server        192.168.1.110;

filename "/pxelinux.0";

subnet 192.168.1.0 netmask 255.255.255.0 {

option subnet-mask        255.255.255.0;

option routers        192.168.1.1;

option domain-name        "gw.local";

range dynamic-bootp 192.168.1.131 192.168.1.199;

default-lease-time 21600;

max-lease-time 43200;

}

8、创建Kickstart 配置文件ks.cfg

安装system-config-kickstart, 运行它即Kickstart Configurator来生成kickstart 配置文件ks.cfg.

# yum -y install system-config-kickstart

# system-config-kickstart

保存ks.cfg文件到/var/www/html/ks目录下

   

/var/www/html/ks/ks.cfg 文件内容如下：

(整个实验过程的重点和难点，请关注)

[root@luxvm1 ~]# cat /var/www/html/ks/ks.cfg

#platform=x86, AMD64, or Intel EM64T

#version=DEVEL

# Install OS instead of upgrade

install

# Keyboard layouts

keyboard 'us'

# Root password

rootpw --iscrypted $1$P2aQRXER$vJ1vvyd38QyNaOYQKOv19/

# Use network installation

url --url="http://192.168.1.110/CentOS-7"

# System language

lang en_US

# Firewall configuration

firewall --disabled

# System authorization information

auth --useshadow --passalgo=sha512

# Use graphical install

graphical

firstboot --disable

# SELinux configuration

selinux --disabled

   

# Network information

network --bootproto=dhcp --device=eth0

# Reboot after installation

reboot

# System timezone

timezone Asia/Shanghai

# System bootloader configuration

bootloader --location=mbr --driveorder=sda

autopart --type=lvm

# Clear the Master Boot Record

zerombr

# Partition clearing information

clearpart --all --initlabel

# Disk partitioning information

   

#

%packages

@^minimal

@core

chrony

kexec-tools

openscap

openscap-scanner

scap-security-guide

%end

%addon org_fedora_oscap

content-type = scap-security-guide

profile = standard

%end

   

%addon com_redhat_kdump --enable --reserve-mb='auto'

%end

   

%anaconda

pwpolicy root --minlen=6 --minquality=50 --notstrict --nochanges --notempty

pwpolicy user --minlen=6 --minquality=50 --notstrict --nochanges --notempty

pwpolicy luks --minlen=6 --minquality=50 --notstrict --nochanges --notempty

%end

   

附加：

PXE CentOS7 information