centos 7.5 dnsmasq 安装或者升级版本

1.离线安装

①通过https://pkgs.org/ 下载安装包 dnsmasq-2.76-16.el7_9.1.x86_64.rpm，dnsmasq-2.76-16.el7.x86_64.rpm

②通过 rpm -ivh dnsmasq-2.76-16.el7.x86_64.rpm,rpm -Uvh dnsmasq-2.76-16.el7_9.1.x86_64.rpm, 安装

2.修改配置

2.1配置dnsmasq.conf文件

①resolv-file：从文件读取 DNSMasq 上游的 DNS 服务器配置

② 开启strict-order
③listen-address选项用于设置dnsmasq监听的IP地址。要使用您的CentOS/RHEL服务器在LAN上侦听DHCP和DNS请求，请如图所示将listen-address选项设置为其LAN IP地址（请记住包括127.0.0.1）。请注意，服务器IP必须是静态的。

listen-address=::1,127.0.0.1,192.168.70.167

④ addn-hosts：从文件读取本地 DNS 域名和 IP 的对应关系

2.2 vim /etc/resolv.conf

①配置

②修改 /etc/resolv.conf文件由本地守护程序（尤其是NetworkManager）维护，因此任何用户进行的更改都将被覆盖。为了防止这种情况，请使用chattr命令通过设置不可变文件属性（禁用对文件的写访问）来对其进行写保护。

# chattr +i /etc/resolv.conf
# lsattr /etc/resolv.conf

2.3 vim /etc/hosts.dnsmasq

168.56.1  www.taobai.com
168.56.2  www.taobai.com
168.56.3  www.taobai.com

3.启动

① . systemctl daemon-reload
 
②  systemctl enable dnsmasq
 
③  systemctl start dnsmasq
 
④  systemctl status dnsmasq

⑤如果正在运行Firewalld服务，则需要在防火墙配置中打开DNS和DHCP服务，以允许来自LAN上主机的请求传递到dnsmasq服务器。

# firewall-cmd --add-service=dns --permanent
# firewall-cmd --add-service=dhcp --permanent
# firewall-cmd --reload

4.测试

两台硬件终端通过域名能通

参考：https://cloud.tencent.com/developer/article/1662602

5.升级

5.1 下载

http://www.thekelleys.org.uk/dnsmasq/dnsmasq-2.86.tar.gz 下面下载最新的安装包

5.2 解压

tar -zxvf dnsmasq-2.86.tar.gz -C /usr/local

5.3 编译安装

cd dnsmasq-2.86
make install

5.4 编辑启动脚本

命令： vim /etc/init.d/dnsmasq

#!/bin/sh
#
# Startup script for the <span class='wp_keywordlink_affiliate'><a href="http://itgeeker.net/tag/dns/" title="View all posts in DNS" target="_blank">DNS</a></span> caching server
#
# chkconfig: - 49 50
# description: This script starts your DNS caching server
# processname: dnsmasq
# pidfile: /var/run/dnsmasq
# Source function library.
. /etc/rc.d/init.d/functions
# Source networking configuration.
. /etc/sysconfig/network
# Check that networking is up.
[ ${NETWORKING} = "no" ] && exit 0
dnsmasq=/usr/local/sbin/dnsmasq
[ -f $dnsmasq ] || exit 0
RETVAL=0
# See how we were called.
case "$1" in
start)
if [ $UID -ne 0 ] ; then
echo "User has insufficient privilege."
exit 4
fi
echo -n "Starting dnsmasq: "
daemon $dnsmasq $OPTIONS
RETVAL=$?
echo
[ $RETVAL -eq 0 ] && touch /var/lock/subsys/dnsmasq
;;
stop)
if test "x`pidof dnsmasq`" != x; then
echo -n "Shutting down dnsmasq: "
killproc dnsmasq
fi
RETVAL=$?
echo
[ $RETVAL -eq 0 ] && rm -f /var/lock/subsys/dnsmasq /var/run/dnsmasq.pid
;;
status)
status dnsmasq
RETVAL=$?
;;
reload)
echo -n "Reloading dnsmasq: "
killproc dnsmasq -HUP
RETVAL=$?
echo
;;
force-reload)
# new configuration takes effect only after restart
$0 stop
$0 start
RETVAL=$?
;;
restart)
$0 stop
$0 start
RETVAL=$?
;;
condrestart)
if test "x`/sbin/pidof dnsmasq`" != x; then
$0 stop
$0 start
RETVAL=$?
fi
;;
*)
echo "Usage: $0 {start|stop|restart|reload|condrestart|status}"
exit 2
esac
exit $RETVAL