mysql主主复制+keepalived实现高可用

标签：mysql   keepalived   mysql主主复制   高可用   

mysql最简单的高可用

2台pc机

mysql主主复制实现数据的同步

keepalive实现双机热备，保证服务的正常运行

1、环境

Master1  10.0.0.201

Master2 10.0.0.202

2、Master1操作授权

mysql>grant replication slave on *.* to‘admin‘@‘10.0.0.202‘ identified by ‘123456‘;///授权

mysql>show master status\G;

3、Master2操作授权

mysql->grant replication slave on *.* to‘admin‘@‘10.0.0.201‘ identified by ‘123456‘;///授权

mysql->show master status\G;

4、主1-201上操作

change master to 

master_host=‘10.0.0.202‘,

master_user=‘admin‘,

master_password=‘123456‘,

master_log_file=‘mysql-bin.000006‘,

master_log_pos=-242;

mysql->start slave;

mysql->show slave status\G;

5、主2-202上操作

change master to

master_host=‘10.0.0.201‘,

master_user=‘admin‘,

master_password=‘123456‘,

master_log_file=‘mysql-bin.000002‘,

master_log_pos=242;

mysql->start slave;

mysql->show slave status\G;

6、主201 和202同时安装keepalived （也可以用yum安装，我实验用的yum）

# tar -xvf keepalived-1.1.20.tar.gz

# cd keepalived-1.1.20

#./configure  --prefix=/usr/local/keepalived

# make && make install

# cp/usr/local/keepalived/etc/rc.d/init.d/keepalived  /etc/rc.d/init.d/

# cp/usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/

# mkdir /etc/keepalived

# cp /usr/local/keepalived/etc/keepalived/keepalived.conf  /etc/keepalived/

# cp /usr/local/keepalived/sbin/keepalived/usr/sbin/

7.keepalived配置文件

! Configuration File for keepalived

global_defs {

  notification_email {

   }

  notification_email_from Alexandre.Cassen@firewall.loc

}

vrrp_instance VI_1 {

   state BACKUP        ///2个都写为BACKUP不然noprempt没用，主的起了会抢占为主

   interface eth0        ///vip对外接口位置

   virtual_router_id 51   ///标识号，主主要统一

   priority 100          ///优先级，高的在初始时为主

   advert_int 2         

   nopreempt          ///不抢占模式，在优先级高的上设置

    authentication{      ///认证

       auth_type PASS

       auth_pass 1111

    }

   virtual_ipaddress {     ///虚拟ip

       192.168.1.137/24   dev eth0

    }

}

开始我想在keepalive配置文件里写脚本监控mysqld服务，然后一直有问题，我就自己在外面写脚本检测了，脚本如下：

#!/bin/bash

#Totle:check mysql

#Description:check mysql status

#Author:chenmin

#date:2015-09-22

check_mysql_health(){

mysql -h***** -u***** -p**** -e "showslave status\G" >/dev/null 2>&1  ///按mysql授权写

}///检测mysql的可用性

check_keepalived_health() {                    ///检测keepalived服务是否开启

health=`/etc/init.d/keepalived status|grep-c pid`   ///0时为没开启，1为正常

[ $health = 0]&&/etc/init.d/keepalived start      ///如果没开启时就开启keepalived

}

main() {

check_mysql_health&&check_keepalived_health    ///保证mysql可用时keepalived一定可用

check_mysql_health||check_mysql_health||check_mysql_health|| /etc/init.d/keepalived stop

}              ///若3次mysql可用检测都失败则关闭keepalived服务，让backup占用vip

while true      ///死循环，2秒执行一次检测

       do

main

sleep 2

       done

[root@localhost mysqlcheck]# nohup bash/etc/keepalived/mysqlcheck/check_mysql.sh &  

///放后台执行检测

可能还有很多不足，长连接会断开，vip起来时间可能得2秒多等，所以我准备下面用mysql-mmm来实现主主互切。

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mysql主主复制+keepalived实现高可用

标签：mysql   keepalived   mysql主主复制   高可用   

原文地址：http://10554846.blog.51cto.com/10544846/1697185