Nginx+PHP+MySQL双机互备、全自动切换方案

logfile="/var/log/failover.log"

#MySQL可执行文件地址，例如/usr/local/mysql/bin/mysql；MySQL用户名；密码；端口
mysql_bin="/usr/local/webserver/mysql/bin/mysql"
mysql_username="root"
mysql_password="123456"
mysql_port="3306"

#内网网关
gateway_eth0="192.168.146.1"

#主机内网真实IP
rip_eth0_master="192.168.146.213"

#备机内网真实IP
rip_eth0_slave="192.168.146.215"

#主机、备机内网共用的虚拟IP
vip_eth0_share="192.168.113.214"


#外网网关
gateway_eth1="72.249.146.193"

#主机外网真实IP
rip_eth1_master="72.249.146.213"

#备机外网真实IP
rip_eth1_slave="72.249.146.215"

#主机、备机外网共用的虚拟IP
vip_eth1_share="72.249.146.214"
#---------------配置信息(结束)---------------

#绑定内、外网虚拟IP
function_bind_vip()
{
/sbin/ifconfig eth0:vip ${vip_eth0_share} broadcast ${vip_eth0_share} netmask 255.255.255.255 up
/sbin/route add -host ${vip_eth0_share} dev eth0:vip
/sbin/ifconfig eth1:vip ${vip_eth1_share} broadcast ${vip_eth1_share} netmask 255.255.255.255 up
/sbin/route add -host ${vip_eth1_share} dev eth1:vip
/usr/local/webserver/php/sbin/php-fpm reload
kill -USR1 `cat /usr/local/webserver/nginx/logs/nginx.pid`
/sbin/service crond start
}

#解除内、外网虚拟IP
function_remove_vip()
{
/sbin/ifconfig eth0:vip ${vip_eth0_share} broadcast ${vip_eth0_share} netmask 255.255.255.255 down
/sbin/ifconfig eth1:vip ${vip_eth1_share} broadcast ${vip_eth1_share} netmask 255.255.255.255 down
/sbin/service crond stop
}

#主机向备机推送文件的函数
function_rsync_master_to_slave()
{
/usr/bin/rsync -zrtuog /data0/htdocs/ ${rip_eth0_slave}::data0_htdocs/ > /dev/null 2>&1
/usr/bin/rsync -zrtuog /usr/local/webserver/php/etc/ ${rip_eth0_slave}::php_etc/ > /dev/null 2>&1
/usr/bin/rsync -zrtuog /usr/local/webserver/nginx/conf/ ${rip_eth0_slave}::nginx_conf/ > /dev/null 2>&1
}

#备机向主机推送文件的函数
function_rsync_slave_to_master()
{
/usr/bin/rsync -zrtuog /data0/htdocs/ ${rip_eth0_master}::data0_htdocs/ > /dev/null 2>&1
/usr/bin/rsync -zrtuog /usr/local/webserver/php/etc/ ${rip_eth0_master}::php_etc/ > /dev/null 2>&1
/usr/bin/rsync -zrtuog /usr/local/webserver/nginx/conf/ ${rip_eth0_master}::nginx_conf/ > /dev/null 2>&1
}

#虚拟IP ARPing
function_vip_arping()
{
/sbin/arping -I eth0 -c 3 -s ${vip_eth0_share} ${gateway_eth0} > /dev/null 2>&1
/sbin/arping -I eth1 -c 3 -s ${vip_eth1_share} ${gateway_eth1} > /dev/null 2>&1
}

while true
do
#用HTTP协议检查虚拟IP
if (curl -m 30 -G http://${vip_eth1_share}/ > /dev/null 2>&1) && (${mysql_bin} -u"${mysql_username}" -p"${mysql_password}" -P"${mysql_port}" -h"${vip_eth0_share}" -e"show slave statusG" > /dev/null 2>&1)