dnsmasq部署pxe服务器脚本

Posted 2020-10-07

dnsmasq中文参考资料(必看)：https://wiki.archlinux.org/index.php/Dnsmasq_(%E7%AE%80%E4%BD%93%E4%B8%AD%E6%96%87)

目标：dnsmasq部署pxe服务器脚本
网络环境:
kvm+vsftpd服务器:192.168.10.7

dnsmasq简介

  Dnsmasq 提供 DNS 缓存和 DHCP 服务功能。作为域名解析服务器(DNS)，dnsmasq可以通过缓存 DNS 请求来提高对访问过的网址的连接速度。作为DHCP 服务器，dnsmasq 可以用于为局域网电脑分配内网ip地址和提供路由。
         
   DNS和DHCP两个功能可以同时或分别单独实现。dnsmasq轻量且易配置，适用于个人用户或少于50台主机的网络。由于dnsmasq可以管理tftp-server服务。因此可以用来搭建PXE服务器。

#临时测试：
systemctl   stop   firewalld
systemctl   stop   libvirtd
setenforce  0

#准备本地yum源
mkdir  -pv  /dvd
mount   /dev/cdrom   /dvd
chmod  +x  /etc/rc.d/rc.local
grep  dvd   /etc/rc.d/rc.local || echo   ‘mount   /dev/cdrom   /dvd‘  > /etc/rc.d/rc.local
source   /etc/rc.d/rc.local
cd  /etc/yum.repos.d
mkdir  -pv  bak/
mv  -v  *.repo  bak/
cat  > dvd.repo <<EOF
[centos73]
name=centos linux 7.3 local
baseurl=file:///dvd
enabled=1
gpgcheck=0

EOF
yum  clean  all
yum  repolist
yum install  -y  vsftpd
mkdir   -pv   /var/ftp/ks/

yum install  -y dnsmasq  curl  tftp-server  xinetd  syslinux  mlocate
mkdir  -v   /var/lib/tftpboot/pxelinux.cfg   /var/lib/tftpboot/centos7/   /var/ftp/dvd/
systemctl  restart  vsftpd
mount  /dev/cdrom   /var/ftp/dvd

updatedb
locate   pxelinux.0
cp  -v  /usr/share/syslinux/pxelinux.0  /var/lib/tftpboot/
cp  -v  /usr/share/syslinux/menu.c32    /var/lib/tftpboot/
cp  -v  /dvd/isolinux/*   /var/lib/tftpboot/centos7/
touch  /var/lib/tftpboot/pxelinux.cfg/default

#创建pxe启动菜单default文件
cat  > /var/lib/tftpboot/pxelinux.cfg/default <<EOF
default menu.c32
prompt 0
timeout 300
ONTIMEOUT local

menu title ##########      PXE Boot Menu ##########

label 1
menu label ^1)InstallCentOS7  x64 withLocalRepo
kernel      centos7/vmlinuz
append initrd=centos7/initrd.img  method=ftp://192.168.10.7/dvd  devfs=nomount
#ks=ftp://192.168.10.7/ks/7text.ks

label 2
menu label ^2)InstallCentOS7 x64 with http://mirror.centos.org Repo
kernel      centos7/vmlinuz
append initrd=centos7/initrd.img  method=http://mirror.centos.org/centos/7/os/x86_64/  devfs=nomount  ip=dhcp

label 3
menu label ^3)InstallCentOS7 x64 withLocalRepousing VNC
kernel      centos7/vmlinuz
append initrd=centos7/initrd.img  method=ftp://192.168.10.7/pub devfs=nomount inst.vnc  inst.vncpassword=password

label 4
menu label ^4)Bootfromlocal      drive
EOF

cat  /var/lib/tftpboot/pxelinux.cfg/default

测试dnsmasq手动启动(已测OK)：
netstat  -atunlp|grep  dnsmasq
systemctl  stop  libvirtd
systemctl  stop  dnsmasq
pkill  -9   dnsmasq
dnsmasq  --interface=ens33  --dhcp-range=192.168.10.100,192.168.10.150  --dhcp-boot=pxelinux.0  --enable-tftp  --tftp-root=/var/lib/tftpboot/

dnsmasq  -i  ens33  -F 192.168.10.100,192.168.10.150  -M  pxelinux.0   --enable-tftp  --tftp-root=/var/lib/tftpboot/

#以上的临时测试完毕(已测OK)
-----------------------------------------------------------------------
#正式编写dnsmasq自动部署pxe服务器的脚本

vi   dnsmasq.sh   脚本代码如下
#!/bin/bash
setenforce   0
getenforce
sed  -i    ‘/^SELINUX=/c\SELINUX=disable‘   /etc/selinux/config
grep   ^SELINUX    /etc/selinux/config

systemctl   stop   firewalld
systemctl   disable   firewalld
systemctl   stop   libvirtd
systemctl   disable   libvirtd

read  -p    ‘selinux和firewalld已关闭,按回车键继续配置本地yum源...‘

#准备本地yum源
mkdir  -pv  /dvd
mount   /dev/cdrom   /dvd
chmod  +x  /etc/rc.d/rc.local
grep  dvd   /etc/rc.d/rc.local || echo   ‘mount   /dev/cdrom   /dvd‘  > /etc/rc.d/rc.local
source   /etc/rc.d/rc.local
cd  /etc/yum.repos.d
mkdir  -pv  bak/
mv  -v  *.repo  bak/
cat  > dvd.repo <<EOF
[centos73]
name=centos linux 7.3 local
baseurl=file:///dvd
enabled=1
gpgcheck=0

EOF
yum  clean  all
yum  repolist
mkdir   -pv   /var/ftp/ks/

yum install  -y dnsmasq  vsftpd  curl  tftp-server  xinetd

cp  -v  /etc/dnsmasq.conf /etc/dnsmasq.conf.bak
grep -Ev ‘^#|^$‘ /etc/dnsmasq.conf
cat   >/etc/dnsmasq.d/dhcp.conf <<EOF
#接口设置，在94行
interface=ens33,lo
#监听IP地址,在99行
#listen-address=192.168.10.7
#绑定接口,在112行
#bind-interfaces
#域名,#在132行
domain=sky.com
# DHCP range-leases,dhcp租约信息,在145行
dhcp-range= ens33,192.168.10.100,192.168.10.200,255.255.255.0,1h
#ip和mac地址绑定
#dhcp-host=aa:bb:cc:dd:ee:ff,192.168.111.50
# PXE启动文件和tftp服务器ip地址,在418行
dhcp-boot=pxelinux.0,pxeserver,192.168.10.7    
# Gateway网关,在312行
dhcp-option=3,192.168.10.1
# DNS服务器IP地址
dhcp-option=6,114.114.114.114,8.8.8.8
server=8.8.4.4
# Broadcast Address广播地址
dhcp-option=28,192.168.10.255
# NTP Server网络时间服务器IP地址,
dhcp-option=42,0.0.0.0
#pxe启动时的命令提示,在448行
pxe-prompt="Press F8  for menu.", 5
#pxe服务,在458行
pxe-service=x86PC,"Install CentOS 7 from network server 192.168.10.7", pxelinux
#启用tftp服务,在473行
enable-tftp
#tftp文件共享的根目录，在476行
tftp-root=/var/lib/tftpboot

EOF

grep -Ev ‘^#|^$‘ /etc/dnsmasq.d/dhcp.conf

yum install  -y syslinux  mlocate
yum install  -y  tftp-server  xinetd
ls /usr/share/syslinux
updatedb
locate   pxelinux.0
cp  -v  /usr/share/syslinux/pxelinux.0  /var/lib/tftpboot/

mkdir      /var/lib/tftpboot/pxelinux.cfg
touch      /var/lib/tftpboot/pxelinux.cfg/default

cat  > /var/lib/tftpboot/pxelinux.cfg/default <<EOF
default menu.c32
prompt 0
timeout 15
ONTIMEOUT local

menu title ##########      PXE Boot Menu ##########

label 1
menu label ^1)InstallCentOS7  x64 withLocalRepo
menu  default
kernel      centos7/vmlinuz
append initrd=centos7/initrd.img  method=ftp://192.168.10.7/dvd  devfs=nomount
#ks=ftp://192.168.10.7/ks/7text.ks

label 2
menu label ^2)InstallCentOS7 x64 with http://mirror.centos.org Repo
kernel      centos7/vmlinuz
append initrd=centos7/initrd.img  method=http://mirror.centos.org/centos/7/os/x86_64/  devfs=nomount  ip=dhcp

label 3
menu label ^3)InstallCentOS7 x64 withLocalRepousing VNC
kernel      centos7/vmlinuz
append initrd=centos7/initrd.img  method=ftp://192.168.10.7/dvd  devfs=nomount inst.vnc  inst.vncpassword=password

label 4
menu label ^4)Bootfromlocal      drive
EOF

cat  /var/lib/tftpboot/pxelinux.cfg/default
mkdir  -v  /var/lib/tftpboot/centos7/

cp  -v  /dvd/isolinux/*  /var/lib/tftpboot/centos7/

pkill  -9  dnsmasq
systemctl restart dnsmasq
systemctl restart vsftpd
systemctl status dnsmasq
systemctl status vsftpd
systemctl enable dnsmasq
systemctl enable vsftpd
netstat  -atunlp|grep  dnsmasq

#脚本编写完毕