MySQL高可用性之Keepalived+MySQL（双主热备）

MySQL高可用性之Keepalived+MySQL（双主热备）

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
[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 {
[email protected]
 }
notification_email_from  [email protected]
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
  }
}