阿里云RDS与本地ECS自己建库主从同步
1.首先拿到RDS实例的用户名，密码 ，已经内网的IP地址
地址：可以在其他机器 ping 这个内网地址就拿到 IP地址了
密码：
这样就拿到了 RDS实例的IP地址，用户名，跟密码了
2. 将你要同步的数据库导出
mysqldump -hrm-wz90r4h72ir7630bm.mysql.rds.aliyuncs.com -uxxxxxx -pxxxx--routines --single_transaction --master-data=2 --databases db_name >db_name.sql 数据库备份
3.通过scp的方式copy到从库机器上
4.编辑从库/etc/my.cnf文件
[mysqld]
basedir = /usr/local/mysql
datadir = /data
server_id= 211
#GTID: #由于RDS开启了GTID模式，所以我们从库也要开启该模式
gtid_mode = on
enforce_gtid_consistency = 1
log-slave-updates = 1
binlog_format = row
explicit_defaults_for_timestamp=true
log-bin=mysql-bin
#relay log
skip_slave_start=1
sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES
expire_logs_days = 10
max_binlog_size = 100M
replicate-do-db = sanqin_article
replicate-do-db = sanqin_payment
replicate-do-db = sanqin_user
replicate-ignore-db = mysql
replicate-ignore-db = information_schema
replicate-ignore-db = performance_schema
[inonodb]
innodb_buffer_pool_size=64MB
：wq! #报错
5.启动服务
service mysqld start
6.登陆从库的MYSQL
create database db_name #库的名字要跟主的一样
7.然后导入到数据库
mysql> source /root/db_name.sql
8. 查看db_name.sql 的pos值
记录这个值
9 .添加 host 记录
[[email protected] /root]
#cat /etc/hosts
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
10.1.0.126 rm-wz90r4h72ir7630bm.mysql.rds.aliyuncs.com
#IP地址是RDS实例的IP地址 。这个请去阿里云平台查询，
#DMS内网的链接地址：rm-wz90r4h72ir7630bm.mysql.rds.aliyuncs.com
10.登陆数据库，执行主从同步
change master to master_host='x.x.x.x ',master_user='xxxx',master_password='xxxxxxx ',master_port=3306,master_log_file='mysql-bin.000277 ',master_log_pos=309622;
注：如果执行这边命令的时候报错，报 is Active 之类的，需要执行
mysql>stop slave
mysql>change master to master_auto_position=0;
mysql>start slave ;
mysql>show slave status;
注：
master_host : RDS实例的IP地址
master_user： RDS上DMS的账号
master_password: RDS上DMS的密码
master_port :RDS实例的端口
master_log_file:mysql-bin.000xxx 这个要登陆RDS主实例上去执行 show master status 得到的
master_log_pos: 这个 在导出db_name.sql 中得到，表示从库从这个地方去同步RDS
在RDS上操作：
Welcome to the MariaDB monitor. Commands end with ; or \g.
Your MySQL connection id is 654718428
Server version: 5.6.34 Source distribution
Copyright (c) 2000, 2017, Oracle, MariaDB Corporation Ab and others.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
MySQL [(none)]> show master status;
+------------------+----------+--------------+------------------+--------------------------------------------------------------------------------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+------------------+----------+--------------+------------------+--------------------------------------------------------------------------------------------+
| mysql-bin.000277 | 611357 | | | 18365a21-081e-11e8-9275-7cd30ac334da:1-558646,
fa4292ef-081d-11e8-9274-7cd30ab49d30:1-6884 |
+------------------+----------+--------------+------------------+--------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)
MySQL [(none)]>
11.启动slave
start slave;
12.查看slave状态
至此，完成