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 ~]
[root@master ~]
[root@master ~]
[root@master ~]
[mysqld]
server-id = 1
log-bin = mysql-bin
binlog-ignore-db = mysql,information_schema
auto-increment-increment = 2
auto-increment-offset = 1
slave-skip-errors = all
[root@master ~]
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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> 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;
mysql> start slave;
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backup配置如下：
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[root@backup ~]
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 ~]
[root@master ~]
[root@master ~]
[root@master ~]
make && make install
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#将keepalived配置成系统服务
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[root@master ~]
[root@master ~]
[root@master ~]
[root@master ~]
[root@master ~]
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[root@master ~]
! 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
}
vrrp_instance VI_1 {
state BACKUP
interface eth0
virtual_router_id 51
priority 100
advert_int 1
nopreempt
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.0.204
}
}
virtual_server 192.168.0.204 3306 {
delay_loop 2
persistence_timeout 50
protocol TCP
real_server 192.168.0.202 3306 {
weight 3
notify_down /usr/local/keepalived/mysql.sh
TCP_CHECK {
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
}
}
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[root@master ~]
pkill keepalived
[root@master ~]
[root@master ~]
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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。
