配置Keepalived实现Mysql双主高可用配置（完整配置）

随着公司的发展，数据显得尤为重要，上次写了服务器的安全操作知之外，今天给大家写一篇针对mysql的双主高可用配置。

本文讲述配置Keepalived实现Mysql双主高可用配置，其中所需知识包含iptables，mysql，sendmail，Keepalived，shell或者其它脚本语言均可。差不多就这么多吧。自己也百度了许多文章，很多都没有讲全，今天我就把整个过程给大家讲述清楚，由于本次内容众多，部分内容不贴图，不全部解释配置是何含义，希望大家理解。如遇不懂的可以加博主私人QQ1156178046，欢迎技术交流！

首先介绍环境

DB 1 centerOS 7  192.168.10.11 +iptables+keepalived master+ntp+sendmail+shell

DB 2 centerOS 7  192.168.10.12 +iptables+keepalived backup+sendmail+shell

VIP地址 192.168.10.20

1.安装mysql部分

yum -y install mysql

如果遇到yum没有可用mysql-server安装源，可见如下配置

wget http://repo.mysql.com/mysql-community-release-el7-5.noarch.rpm  rpm -ivh mysql-community-release-el7-5.noarch.rpm 
yum install mysql-server

2.修改DB 1 mysql配置文件，在[mysqld] 段下添加如下内容

vi /etc/my.cnf

 server-id = 1

log-bin=mysql-bin

relay-log = mysql-relay-bin

replicate-wild-ignore-table=mysql.%

replicate-wild-ignore-table=test.%

replicate-wild-ignore-table=information_schem.%

max_allowed_packet = 500M

3.修改DB 2 mysql配置文件，在[mysqld] 段下添加如下内容

vi /etc/my.cnf

 server-id = 2

log-bin=mysql-bin

relay-log = mysql-relay-bin

replicate-wild-ignore-table=mysql.%

replicate-wild-ignore-table=test.%

replicate-wild-ignore-table=information_schem.%

4.手动同步数据库

使用数据库工具mysqldump导入导出即可，命令不赘述。

5.DB 1创建用户并且授权

create USER 'sshs'@'%' IDENTIFIED BY '123456';

grant replication slave on *.* to 'sshs'@'192.168.10.12' identified by '123456';

FLUSH privileges;

6.DB 2创建用户并且授权

create USER 'sshs'@'%' IDENTIFIED BY '123456';

grant replication slave on *.* to 'sshs'@'192.168.10.11' identified by '123456';

FLUSH privileges;

7.在DB1 上设置DB2为自己的主服务器,其中master_log_file和master_log_pos对应的是DB2上show master status;命令结果中的File 和Postion

change master to master_host='192.168.10.12',master_user='sshs',master_password='123456',master_log_file='mysql-bin.000001',master_log_pos=106;

start slave;

show slave status\G;

其中重点关注slave_IO-running 和Slave_SQL_Running 值均为YEs即可。

8.在DB2 上设置DB1为自己的主服务器,其中master_log_file和master_log_pos对应的是DB1上show master status;命令结果中的File 和Postion

change master to master_host='192.168.10.11',master_user='sshs',master_password='123456',master_log_file='mysql-bin.000001',master_log_pos=106;

start slave;

show slave status\G;

其中重点关注slave_IO-running 和Slave_SQL_Running 值均为YEs即可。

9.不使用最新firewalld ，使用iptables 并开启防火墙。

systemctl stop firewalld

systemctl mask firewalld

yum install iptables-services

systemctl enable iptables

service iptables start

防火墙通过命令可借鉴如下

iptables -L -n

iptables -I
4000
INPUT -s 0.0.0.0/0 -j ACCEPT

iptables -I OUTPUT -s 0.0.0.0/0 -j ACCEPT

service iptables save

service iptables restart

10.安装sendmail

可查看这篇文章   http://blog.csdn.net/jeccisnd/article/details/72885682    如何使用sendmail实现向外网发送邮件。（也是我写的。。。）

11.DB 1 Keepalived安装部分。DB 2一样

wget http://www.keepalived.org/software/keepalived-1.3.5.tar.gz

tar zxvf keepalived-1.3.5.tar.gz

cd keepalived-1.3.5.tar.gz

./config --sysconf=/etc --with-kernel-dir=/usr/src/kernels/

make

make install

ln -s /usr/local/sbin/keepalived /sbin

chkconfig keepalived on

12.DB 1 配置部分如下,DB 2,将state master 更改为state backup ,priority 100更改为priority 80即可

! Configuration File for keepalived

global_defs {

   router_id LVS_DEVEL

   vrrp_skip_check_adv_addr

   vrrp_strict

   vrrp_garp_interval 0

   vrrp_gna_interval 0

}

vrrp_script check_mysqld {

   script "killall -0 mysqld"

! 检查mysql是否存在，可引用脚本检测mysql slave状态,这里只做简单演示

   interval 2

   weight 21

}

vrrp_instance G1 {

    state MASTER

    interface ens33

    virtual_router_id 20

    priority 100

    advert_int 2

    nopreempt

    authentication {

        auth_type PASS

        auth_pass qwaszx

    }

    notify_master "/etc/keepalived/master.sh"

    notify_backup "/etc/keepalived/backup.sh"

    notify_fault "/etc/keepalived/fault.sh"

    track_script {

    check_mysqld

}

    virtual_ipaddress {

        192.168.10.20/24 dev ens33

    }

}

其中master.sh文件如下

#!/bin/bash

HOSTIP=`ifconfig eth0 | grep inet | egrep -v inet6 | awk -F 'net' '{print $2}'`

输出本机IP

LOGFILE=/var/log/keepalived-state.log

#状态改变过程，可查看此文件

echo "[Master]" >> $LOGFILE

date >> $LOGFILE

echo "$HOSTNAME ,$HOSTIP ==>  MASTER " | mail -s "This is Test " youremail@mail.com

#发送通知邮件

其中backup.sh文件如下

#!/bin/bash

HOSTIP=`ifconfig eth0 | grep inet | egrep -v inet6 | awk -F 'net' '{print $2}'`

输出本机IP

LOGFILE=/var/log/keepalived-state.log

#状态改变过程，可查看此文件

echo "[Master]" >> $LOGFILE

date >> $LOGFILE

echo "$HOSTNAME ,$HOSTIP ==>  BACKUP " | mail -s "This is Test " youremail@mail.com

#发送通知邮件

其中fault.sh文件如下

#!/bin/bash

HOSTIP=`ifconfig eth0 | grep inet | egrep -v inet6 | awk -F 'net' '{print $2}'`

输出本机IP

LOGFILE=/var/log/keepalived-state.log

#状态改变过程，可查看此文件

echo "[Master]" >> $LOGFILE

date >> $LOGFILE

echo "$HOSTNAME ,$HOSTIP ==>  fault " | mail -s "This is Test " youremail@mail.com

#发送通知邮件

13.启动及关闭命令

service iptables start | stop | restart

service sendmail start | stop | restart

service mysqld start | stop | restart

service keepalived start | stop | restart 或者killall keepalived

通过tail -f /var/log/messages查看程序日志。

14.看到最后的小伙伴不容易，这里奉上检测mysql slave 状态脚本

vi /etc/keepalived/mysqlcheck_slave.sh

相关Keepalived配置文件写法为,其它不变

script "/etc/keepalived/mysqlcheck_slave.sh"

#!/bin/bash

MYSQL=`which mysql`

MYSQL_HOST=localhost

MYSQL_USER=root

MYSQL_PASSWORD="xxxxxxxxx"

MYSQL_PORT=3306

IA=`$MYSQL -h $MYSQL_HOST -u $MYSQL_USER -p$MYSQL_PASSWORD -P$MYSQL_PORT -e "show slave status\G;" |grep Slave_IO_Running | awk -F ':' '{print $2}'`

SA=`$MYSQL -h $MYSQL_HOST -u $MYSQL_USER -p$MYSQL_PASSWORD -P$MYSQL_PORT -e "show slave status\G;" |grep Slave_SQL_Running |egrep -v Slave_SQL_Running_State | awk -F '': '{print $2}'`

MYSQLA=`killall -0 mysqld`

MYSQLB=`echo $?`

if [ $MYSQLB == "0" -a $IA == "Yes" -a $SA = "Yes" ];then

        MYSQL_STATUS=0

 else

        MYSQL_STATUS=1

 fi

        exit $MYSQL_STATUS

注明：脚本已经修改，测试Keepalived切换成功，原方法可能由于执行环境的变化，导致Keepalived执行免密查询sql命令失败，导致判断不了读写状态，特此改变！

20170612

亲测可用！！！

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