MYSQL主从:主(生产库)-->从(新实例)
搭建主(mysqld3307，生产库) --> 从(mysqld3309)
# 备份mysqld3307数据。最好在生产库压力小的时候进行
mysql-3307/install/bin/mysqldump -uroot -p -A --flush-logs --lock-all-tables --master-data=1 > ./bak_3307.sql

# 授权同步账户
mysql-3307/install/bin/mysql -uroot -ppwd -e "GRANT REPLICATION SLAVE on *.* to 'repl'@'%' identified by 'repl@pwd'; FLUSH PRIVILEGES;"

# 搭建mysqld3309实例
参见http://babaoqi.iteye.com/admin/blogs/1954110

# 关闭mysqld3309服务
service mysqld3309 stop;

# 配置my.cnf
vim /home/bbq/mysql/mysql-3309/cnf/my.cnf
log-bin=mysql-bin
binlog_format=mixed
read_only
# 主库执行show slave hosts显示使用
report_host=localhost #本机地址
report_port=3309      #本实例端口
log_slave_updates
server-id   = 3309

# 启动mysqld3309服务
service mysqld3309 start;

# 设置同步起始位置。bak_3307.sql中已经含有file position信息，不用再设置
mysql-3309/install/bin/mysql -uroot -plm -e "CHANGE MASTER TO master_host='localhost',master_port=3307, master_user='repl',master_password='repl@pwd'"

# 导入生产库备份
mysql-3309/install/bin/mysql -uroot -plm < bak_3307.sql

# 开启同步，查看同步状态 START SLAVE;SELECT SLEEP(1);SHOW SLAVE STATUS\G;
mysql-3309/install/bin/mysql -uroot -plm -e "START SLAVE;SELECT SLEEP(1);SHOW SLAVE STATUS\G;"
若是SQL线程(Slave_IO_Running)和I/O线程(Slave_SQL_Running)都显示为YES状态，则搭建成功.