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MySQL高可用性之Keepalived+Mysql(双主热备)

IT技术博客大学习 2015-11-25
226

环境描述:

OS:CentOS6.5_X64

MASTER:192.168.0.202

BACKUP:192.168.0.203

VIP:192.168.0.204


1、配置两台Mysql主主同步


[root@master ~]# yum install mysql-server mysql -y

[root@master ~]# service mysqld start

[root@master ~]# mysqladmin -u root password 123.com

[root@master ~]# vi /etc/my.cnf #开启二进制日志,设置id

[mysqld]

server-id = 1 #backup这台设置2

log-bin = mysql-bin

binlog-ignore-db = mysql,information_schema #忽略写入binlog日志的库

auto-increment-increment = 2 #字段变化增量值

auto-increment-offset = 1 #初始字段ID为1

slave-skip-errors = all #忽略所有复制产生的错误

[root@master ~]# service mysqld restart


#先查看下log bin日志和pos值位置


master配置如下:

[root@ master ~]# mysql -u root -p123.com

mysql> GRANT REPLICATION SLAVE ON *.* TO 'replication'@'192.168.0.%' IDENTIFIED BY 'replication';

mysql> flush privileges;

mysql> change master to

-> master_host='192.168.0.203',

-> master_user='replication',

-> master_password='replication',

-> master_log_file='mysql-bin.000002',

-> master_log_pos=106; #对端状态显示的值

mysql> start slave; #启动同步


backup配置如下:

[root@backup ~]# mysql -u root -p123.com

mysql> GRANT REPLICATION SLAVE ON *.* TO 'replication'@'192.168.0.%' IDENTIFIED BY 'replication';

mysql> flush privileges;

mysql> change master to

-> master_host='192.168.0.202',

-> master_user='replication',

-> master_password='replication',

-> master_log_file='mysql-bin.000002',

-> master_log_pos=106;

mysql> start slave;


#主主同步配置完毕,查看同步状态Slave_IO和Slave_SQL是YES说明主主同步成功。



在master插入数据测试下:


在backup查看是否同步成功:


可以看到已经成功同步过去,同样在backup插入到user表数据,一样同步过去,双主就做成功了。


2、配置keepalived实现热备

[root@backup ~]# yum install -y pcre-devel openssl-devel popt-devel #安装依赖包


[root@master ~]# wget http://www.keepalived.org/software/keepalived-1.2.7.tar.gz

[root@master ~]# tar zxvf keepalived-1.2.7.tar.gz

[root@master ~]# cd keepalived-1.2.7

[root@master ~]#./configure --prefix=/usr/local/keepalived

make && make install


#将keepalived配置成系统服务


[root@master ~]# cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/

[root@master ~]# cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/

[root@master ~]# mkdir /etc/keepalived/

[root@master ~]# cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/

[root@master ~]# cp /usr/local/keepalived/sbin/keepalived /usr/sbin/


[root@master ~]# vi /etc/keepalived/keepalived.conf

! Configuration File forkeepalived

global_defs {

notification_email {

test@sina.com

}

notification_email_from admin@test.com

smtp_server 127.0.0.1

smtp_connect_timeout 30

router_id MYSQL_HA #标识,双主相同

}

vrrp_instance VI_1 {

state BACKUP #两台都设置BACKUP

interface eth0

virtual_router_id 51 #主备相同

priority 100 #优先级,backup设置90

advert_int 1

nopreempt #不主动抢占资源,只在master这台优先级高的设置,backup不设置

authentication {

auth_type PASS

auth_pass 1111

}

virtual_ipaddress {

192.168.0.204

}

}

virtual_server 192.168.0.204 3306 {

delay_loop 2

#lb_algo rr #LVS算法,用不到,我们就关闭了

#lb_kind DR #LVS模式,如果不关闭,备用服务器不能通过VIP连接主MySQL

persistence_timeout 50 #同一IP的连接60秒内被分配到同一台真实服务器

protocol TCP

real_server 192.168.0.202 3306 { #检测本地mysql,backup也要写检测本地mysql

weight 3

notify_down /usr/local/keepalived/mysql.sh #当mysq服down时,执行此脚本,杀死keepalived实现切换

TCP_CHECK {

connect_timeout 3 #连接超时

nb_get_retry 3 #重试次数

delay_before_retry 3 #重试间隔时间

}

}


[root@master ~]# vi /usr/local/keepalived/mysql.sh

#!/bin/bash

pkill keepalived

[root@master ~]# chmod +x /usr/local/keepalived/mysql.sh

[root@master ~]# /etc/init.d/keepalived start



#backup服务器只修改priority为90、nopreempt不设置、real_server设置本地IP。


#授权两台Mysql服务器允许root远程登录,用于在其他服务器登陆测试!

mysql> grant all on *.* to'root'@'192.168.0.%' identified by '123.com';

mysql> flush privileges;


3、测试高可用性


(1)通过Mysql客户端通过VIP连接,看是否连接成功。


(2)停止master这台mysql服务,是否能正常切换过去,可通过ip addr命令来查看VIP在哪台服务器上。


(3)可通过查看/var/log/messges日志,看出主备切换过程

(4)master服务器故障恢复后,是否主动抢占资源,成为活动服务器。


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