1、環境描述：
OS：CentOS6.5_X64
MASTER：192.168.0.202
BACKUP：192.168.0.20318.
2、設定兩台Mysql主主同步
[root@masterr ~]# yum install mysql-server mysql -y [root@masterr ~]# service mysqld start [root@masterr ~]# mysqladmin -u root proot [root@masterr ~]# 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@masterr ~]# service mysqld restart
master配置如下：
[root@ master ~]# mysql -u root -proot
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[root@backup ~]# mysql -u root -proot
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;
過去，雙主就做成功了。 
3、設定keepalived實作熱備
[root@backup ~]# yum install -y pcre-devel openssl-devel popt-devel #安装依赖包
[root@masterr ~]# wget http://www.keepalived.org/software/keepalived-1.2.7.tar.gz [root@masterr ~]# tar zxvf keepalived-1.2.7.tar.gz [root@masterr ~]# cd keepalived-1.2.7 [root@masterr ~]#./configure --prefix=/usr/local/keepalived make
[root@masterr ~]# cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/ [root@masterr ~]# cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/ [root@masterr ~]# mkdir /etc/keepalived/ [root@masterr ~]# cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/ [root@masterr ~]# cp /usr/local/keepalived/sbin/keepalived /usr/sbin/
[root@masterr ~]# 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@masterr ~]# vi /usr/local/keepalived/mysql.sh #!/bin/bash pkill keepalived [root@masterr ~]# chmod +x /usr/local/keepalived/mysql.sh [root@masterr ~]# /etc/init.d/keepalived start
#backup伺服器只修改priority為90、nopreemptreee
mysql> grant all on *.* to'root'@'192.168.0.%' identified by 'root'; mysql> flush privileges;
#授權兩台Mysql伺服器允許root遠端登錄，用於在其他伺服器登陸測試！
rrreee
4、測試高可用性
1)透過Mysql客戶端透過VIP連接，看是否連接成功。
2)停止master這台mysql服務，是否能正常切換過去，可透過ip addr指令來查看VIP在哪台伺服器上。
3)可透過查看/var/log/messges日誌，看出主備切換過程
注意：服務啟動的順序：先啟動MySQL,後啟動Keepalived。
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