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 /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。