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
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[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
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#先查看下log bin日志和pos值位置
master配置如下：
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[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
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backup配置如下：
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[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;
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#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
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[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
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#将keepalived配置成系统服务
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[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/
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[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
}
}
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[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
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#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。
本文转自 李振良OK 51CTO博客，原文链接：http://blog.51cto.com/lizhenliang/1362313，如需转载请自行联系原作者
