架构图：

 Master配置：

1、开启二进制日志

log_bin=/var/lib/mysql/log_bin

binlog_format=MIXED

2、修改server-id

server-id=1

3、建立授权账号

grant replication slave on *.* to 'repl'@'192.168.0.20' identified by '123456';

4、查看数据库状态

show master status；

查看binlog文件和position

slave1配置：

1、开启二进制日志

log_bin=/var/lib/mysql/log_bin

binlog_format=MIXED

log_slave_updates=1　　#必须要有此参数，否则不会记录binlog日志

2、修改server-id

server-id=2

3、建立授权账号

grant replication slave on *.* to 'repl2'@'192.168.0.30' identified by '123456';

4、查看数据库状态

show master status;

slave2配置

1.关闭二进制日志
2.修改server-id
3.执行同步

写入脚本
mysql<< EOF
change master to
master_host='192.168.0.20',
master_port=3306,
master_user='repl2',
master_password='123456',
master_log_file='log_bin.000005',
master_log_pos=446;
EOF