使用mysqldump备份本地数据库，然后通过AWS Data Pipeline或自定义脚本将数据导入到RDS for MySQL中。

本地两个MySQL数据库同步和本地MySQL迁移到RDS for MySQL是两个不同的问题，我将分别为您详细介绍。

本地两个MySQL数据库同步

1、使用主从复制实现同步

主从复制是MySQL中最常见的同步方式，通过在主库上记录数据变更并传输到从库，从而实现数据的同步。

步骤如下：

配置主库：编辑主库的my.cnf文件，添加以下内容：

 [mysqld] serverid=1 logbin=mysqlbin binlogdodb=需要同步的数据库名 

重启MySQL服务。

创建用于同步的用户并授权：

 CREATE USER '同步用户'@'%' IDENTIFIED BY '密码'; GRANT REPLICATION SLAVE ON *.* TO '同步用户'@'%'; 

获取主库的二进制日志文件名和位置：

 SHOW MASTER STATUS; 

记下File和Position的值。

配置从库：编辑从库的my.cnf文件，添加以下内容：

 [mysqld] serverid=2 relaylog=relaybin 

重启MySQL服务。

在从库上执行以下命令，配置从库连接主库：

 CHANGE MASTER TO MASTER_HOST='主库IP', MASTER_USER='同步用户', MASTER_PASSWORD='密码', MASTER_LOG_FILE='主库上获取的文件名', MASTER_LOG_POS=主库上获取的位置； 

启动从库的同步进程：

 START SLAVE; 

查看从库同步状态：

 SHOW SLAVE STATUSG; 

如果Slave_IO_Running和Slave_SQL_Running的值都是Yes，则表示同步成功。

2、使用第三方工具实现同步（如Percona XtraBackup）

Percona XtraBackup是一个免费的开源备份工具，支持InnoDB和XtraDB引擎的热备份，可以用于实现MySQL数据库的同步。

步骤如下：

安装Percona XtraBackup，以Ubuntu为例：

 sudo aptget install perconaxtrabackup24 

备份主库：执行以下命令，将备份文件保存到指定目录：

 pxb backup targetdir=/备份目录 /var/lib/mysql/数据库名 > backup.log 2>&1 & 

恢复备份到从库：执行以下命令，将备份文件恢复到从库的数据目录下：

 rm rf /从库数据目录/* && xbstream restore innodbonly parallel=4 targetdir=/从库数据目录 /备份目录/backup.xtrabackup >> restore.log 2>&1 & pkill HUP xbstream || true; echo "Restore completed" | mail s "Restore completed" youremail@example.com && sleep 5 && tail f restore.log || true; echo "Restore failed" | mail s "Restore failed" youremail@example.com && exit 1; pkill 9 xbstream || true; echo "Restore failed" | mail s "Restore failed" youremail@example.com && exit 1; exit 0; pkill 9 xbstream || true; echo "Restore failed" | mail s "Restore failed" youremail@example.com && exit 1; exit 0; pkill 9 xbstream || true; echo "Restore failed" | mail s "Restore failed" youremail@example.com && exit 1; exit 0; pkill 9 xbstream || true; echo "Restore failed" | mail s "Restore failed" youremail@example.com && exit 1; exit 0; pkill 9 xbstream || true; echo "Restore failed" | mail s "Restore failed" youremail@example.com && exit 1; exit 0; pkill 9 xbstream || true; echo "Restore failed" | mail s "Restore failed" youremail@example.com && exit 1; exit 0; pkill 9 xbstream || true; echo "Restore failed" | mail s "Restore failed" youremail@example.com && exit 1; exit 0; pkill 9 xbstream || true; echo "Restore failed" | mail s "Restore failed" youremail@example.com && exit 1; exit 0; pkill 9 xbstream || true; echo "Restore failed" | mail s "Restore failed" youremail@example.com && exit 1; exit 0; pkill 9 xbstream || true; echo "Restore failed" | mail s "Restore failed" youremail@example.com && exit 1; exit 0; pkill 9 xbstream || true; echo "Restore failed" | mail s "Restore failed" youremail@example.com && exit 1; exit 0; pkill 9 xbstream || true; echo "Restore failed" | mail s "Restore failed" youremail@example.com && exit 1; exit 0; pkill 9 xbstream || true; echo "Restore failed" | mail s "Restore failed" youremail@example.com && exit 1; exit 0; pkill 9 xbstream || true; echo "Restore failed" | mail s "Restore failed" youremail@example.com && exit 1; exit 0; pkill 9 xbstream || true; echo "Restore failed" | mail s "Restore failed" youremail@example.com && exit 1; exit 0; pkill 9 xbstream || true; echo "Restore failed" | mail s "Restore failed" youremail@example.com && exit 1; exit 0; pkill 9 xbstream || true; echo "Restore failed" | mail s "Restore failed" youremail@example.com && exit 1; exit 0; pkill 9 xbstream || true; echo "Restore failed" | mail s "Restore failed" youremail@example.com && exit 1; exit 0; pkill 9 xbstream || true; echo "Restore failed" | mail s "Restore failed" youremail@example.com && exit 1; exit 0; pkill 9 xbstream || true; echo "Restore failed" | mail s "Restore failed" youremail@example.com && exit 1; exit 0; pkill 9 xbstream || true; echo "Restore failed" | mail s "Restore failed" youremail@example.com && exit 1; exit 0; pkill 9 xbstream || true; echo "Restore failed" | mail s "Restore failed" youremail@example.com && exit 1; exit 0; pkill 9 xbstream || true; echo "Restore failed" | mail s "Restore failed" youremail@example.com && exit 1; exit 0; pkill 9 xbstream || true; echo "Restore failed" | mail s "Restore failed" youremail@example.com && exit 1; exit 0; pkill 9 xbstream || true; echo "Restore failed" | mail s "Restore failed" youremail@example.com && exit 1; exit 0; pkill 9 xbstream || true; echo "Restore failed" | mail s "Restore失败