阿里云ECS，公网IP 121.40.110.2
使用docker安装mysql8，创建三个容器：
实例A：A数据库 A表
实例B：B数据库 B表
实例C：C数据库C表
两种情形：
第一种
A库和B库同步到实例C；
第二种
A库A表和B库B表同步到C库
一、使用docker创建mysql8容器
1、安装docker
yum install docker -y systemctl start docker systemctl enable docker
2、拉取mysql镜像
docker pull mysql
docker images
3、启动三个mysql容器mysql8-1、mysql8-2、mysql8-3
docker run --name mysql8-1 -p 3310:3306 -e MYSQL_ROOT_PASSWORD=123456 -d mysql:latest docker run --name mysql8-2 -p 3311:3306 -e MYSQL_ROOT_PASSWORD=123456 -d mysql:latest docker run --name mysql8-3 -p 3312:3306 -e MYSQL_ROOT_PASSWORD=123456 -d mysql:latest
4、进入mysql8-1容器（先不要建自己的datingcenter等后面测试的库）
docker exec -it mysql8-1 /bin/bash
连接数据库，查看数据库版本
5、设置数据库远程连接
设置远程登录数据库的root账户
mysql8和mysql5的版本不一样，具体操作
GRANT ALL ON *.* TO 'root'@'%';
ALTER USER 'root'@'%' IDENTIFIED WITH mysql_native_password BY '你的密码';
FLUSH PRIVILEGES;
6、创建用户slave用于从库同步复制，授予复制、同步访问
mysql8和mysql5的版本不一样，具体操作
mysql> use mysql;
mysql> CREATE USER 'slave'@'%' IDENTIFIED BY '123456';
mysql>ALTER USER 'slave'@'%' IDENTIFIED WITH mysql_native_password BY '123456';
mysql> GRANT replication slave ON *.* TO 'slave'@'%';
mysql>FLUSH PRIVILEGES;
其他两个容器同样操作
容器安装编辑器vim
https://www.cnblogs.com/xiaoyou2018/p/10912117.html
二、配置数据库多源一从
和mysql一主一从复制相比，多源复制加入了一个叫做Channel的概念， 每一个Channel都是一个独立的Slave，都有一个IO_THREAD和SQL_THREAD。原理和普通复制一样。我们只需要对每一个Master执行Change Master 语句，只需要在每个语句最后使用For Channel来进行区分。多源复制和正常主从其他的配置都一样，基本上主库开下binlog、server-id不一样就可以了，只有下列额外限制：
- master-info-repository必须为TABLE
- relay-log-info-repository必须为TABLE
- 以FOR CHANNEL 'CHANNEL_NAME'区分不同的master。
第一种情形：
主库同步到从库的情况如下配置：
- 主库mysql8-1：IP=121.40.110.2; PORT=3310; server-id=1; database=datingcenter； table=aa、dd
- 主库mysql8-2：IP=121.40.110.2; PORT=3311; server-id=2; database=usercenter ；table=cc、bb
- 从库mysql8-3：IP=121.40.110.2; PORT=3312; server-id=3; database=datingcenter、usercenter、matchcenter ；table=aa、dd、cc、bb
配置约束
- 主从库必须保证网络畅通可访问
- 主库必须开启binlog日志
- 主从库的server-id必须不同
【主库mysql8-1】操作及配置
配置my.cnf（/etc/mysql/my.cnf）
添加如下的内容
client] port = 3306 default-character-set = utf8mb4 [mysql] port = 3306 default-character-set = utf8mb4 [mysqld] ########################## # summary ########################## #bind-address = 0.0.0.0 #port = 3306 #datadir=/datavol/mysql/data #数据存储目录 ########################## # log bin ########################## server-id = 1 #必须唯一 log_bin = mysql-bin #开启及设置二进制日志文件名称 binlog_format = MIXED sync_binlog = 1 expire_logs_days =7 #二进制日志自动删除/过期的天数。默认值为0，表示不自动删除。 #binlog_cache_size = 128m #max_binlog_cache_size = 512m #max_binlog_size = 256M
#要同步的数据库
binlog-do-db = datingcenter
#不需要同步的数据库
binlog-ignore-db = mysql
binlog_ignore_db = information_schema
binlog_ignore_db = performance_schema
binlog_ignore_db = sys
########################## # character set ##########################
character-set-server = utf8mb4
collation-server = utf8mb4_unicode_ci
log_bin是否开启
mysql> show variables like 'log_bin';
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| log_bin | ON |
+---------------+-------+
1 row in set查看master状态
mysql> show master status G;
*************************** 1. row ***************************
File: mysql-bin.000001
Position: 155
Binlog_Do_DB: datingcenter
Binlog_Ignore_DB: mysql,information_schema,performation_schema,sys记住file、position这两个值，后面需要用到
【主库mysql8-2】配置及操作
配置my.cnf
添加如下的内容
client] port = 3306 default-character-set = utf8mb4 [mysql] port = 3306 default-character-set = utf8mb4 [mysqld] ########################## # summary ########################## #bind-address = 0.0.0.0 #port = 3306 #datadir=/datavol/mysql/data #数据存储目录 ########################## # log bin ########################## server-id = 2 #必须唯一 log_bin = mysql-bin #开启及设置二进制日志文件名称 binlog_format = MIXED sync_binlog = 1 expire_logs_days =7 #二进制日志自动删除/过期的天数。默认值为0，表示不自动删除。 #binlog_cache_size = 128m #max_binlog_cache_size = 512m #max_binlog_size = 256M #要同步的数据库 binlog-do-db = usercenter #不需要同步的数据库 binlog-ignore-db = mysql binlog_ignore_db = information_schema binlog_ignore_db = performance_schema binlog_ignore_db = sys ########################## # character set ########################## character-set-server = utf8mb4 collation-server = utf8mb4_unicode_ci
log_bin是否开启
mysql> show variables like 'log_bin';
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| log_bin | ON |
+---------------+-------+
1 row in set查看master状态
mysql> show master status G;
*************************** 1. row ***************************
File: mysql-bin.000002
Position: 155
Binlog_Do_DB: usercenter
Binlog_Ignore_DB: mysql,information_schema,performation_schema,sys 【从库mysql8-3】配置及操作
配置my.cnf
[client] port = 3306 default-character-set = utf8mb4 [mysql] port = 3306 default-character-set = utf8mb4 [mysqld] ########################## # summary ########################## #bind-address = 0.0.0.0 #port = 3306 #datadir=/datavol/mysql/data #数据存储目录 ########################## # log bin ########################## server-id = 3 master_info_repository = table relay_log_info_repository = table ########################## # character set ########################## character-set-server = utf8mb4 collation-server = utf8mb4_unicode_ci
设置【主库】信息
登录【从库mysql8-3】，进入mysql命令行。
mysql> stop slave; Query OK, 0 rows affected mysql> CHANGE MASTER TO MASTER_HOST='121.40.110.2', MASTER_PORT=3310, MASTER_USER='slave', MASTER_PASSWORD='123456', MASTER_LOG_FILE='mysql-bin.000001', MASTER_LOG_POS=155 for channel '1'; Query OK, 0 rows affected mysql> CHANGE MASTER TO MASTER_HOST='121.40.110.2', MASTER_PORT=3311, MASTER_USER='slave', MASTER_PASSWORD='123456', MASTER_LOG_FILE='mysql-bin.000002', MASTER_LOG_POS=155 for channel '2'; Query OK, 0 rows affected mysql> start slave; Query OK, 0 rows affected
stop slave; //停止同步
start slave; //开始同步
//必须和【主库】的信息匹配。
CHANGE MASTER TO
MASTER_HOST='121.40.110.2 //主库IP
MASTER_PORT=3310, //主库端口
MASTER_USER='slave', //访问主库且有同步复制权限的用户
MASTER_PASSWORD='123456', //登录密码
//【关键处】从主库的该log_bin文件开始读取同步信息，主库show master status返回结果
MASTER_LOG_FILE='mysql-bin.000001',
//【关键处】从文件中指定位置开始读取，主库show master status返回结果
MASTER_LOG_POS=155
for channel '1'; //定义通道名称
查看同步状态
mysql> show slave status G;
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 47.111.132.49
Master_User: slave
Master_Port: 3310
Connect_Retry: 60
Master_Log_File: mysql-bin.000006
Read_Master_Log_Pos: 169442
Relay_Log_File: efe0882a2350-relay-bin-1.000017
Relay_Log_Pos: 169656
Relay_Master_Log_File: mysql-bin.000006
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
Replicate_Do_DB:
Replicate_Ignore_DB:
Replicate_Do_Table:
Replicate_Ignore_Table:
Replicate_Wild_Do_Table:
Replicate_Wild_Ignore_Table:
Last_Errno: 0
Last_Error:
Skip_Counter: 0
Exec_Master_Log_Pos: 169442
Relay_Log_Space: 170040
Until_Condition: None
Until_Log_File:
Until_Log_Pos: 0
Master_SSL_Allowed: No
Master_SSL_CA_File:
Master_SSL_CA_Path:
Master_SSL_Cert:
Master_SSL_Cipher:
Master_SSL_Key:
Seconds_Behind_Master: 0
Master_SSL_Verify_Server_Cert: No
Last_IO_Errno: 0
Last_IO_Error:
Last_SQL_Errno: 0
Last_SQL_Error:
Replicate_Ignore_Server_Ids:
Master_Server_Id: 1
Master_UUID: 399257c7-a933-11e9-8d35-0242ac110002
Master_Info_File: mysql.slave_master_info
SQL_Delay: 0
SQL_Remaining_Delay: NULL
Slave_SQL_Running_State: Slave has read all relay log; waiting for more updates
Master_Retry_Count: 86400
Master_Bind:
Last_IO_Error_Timestamp:
Last_SQL_Error_Timestamp:
Master_SSL_Crl:
Master_SSL_Crlpath:
Retrieved_Gtid_Set:
Executed_Gtid_Set:
Auto_Position: 0
Replicate_Rewrite_DB: (datingCenter_0,matchCenter_0),(userCenter_0,matchCenter_0)
Channel_Name: 1
Master_TLS_Version:
Master_public_key_path:
Get_master_public_key: 0
Network_Namespace:
*************************** 2. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 47.111.132.49
Master_User: slave
Master_Port: 3311
Connect_Retry: 60
Master_Log_File: mysql-bin.000006
Read_Master_Log_Pos: 155
Relay_Log_File: efe0882a2350-relay-bin-2.000019
Relay_Log_Pos: 369
Relay_Master_Log_File: mysql-bin.000006
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
Replicate_Do_DB:
Replicate_Ignore_DB:
Replicate_Do_Table:
Replicate_Ignore_Table:
Replicate_Wild_Do_Table:
Replicate_Wild_Ignore_Table:
Last_Errno: 0
Last_Error:
Skip_Counter: 0
Exec_Master_Log_Pos: 155
Relay_Log_Space: 753
Until_Condition: None
Until_Log_File:
Until_Log_Pos: 0
Master_SSL_Allowed: No
Master_SSL_CA_File:
Master_SSL_CA_Path:
Master_SSL_Cert:
Master_SSL_Cipher:
Master_SSL_Key:
Seconds_Behind_Master: 0
Master_SSL_Verify_Server_Cert: No
Last_IO_Errno: 0
Last_IO_Error:
Last_SQL_Errno: 0
Last_SQL_Error:
Replicate_Ignore_Server_Ids:
Master_Server_Id: 2
Master_UUID: 39a3fc71-a933-11e9-ac19-0242ac110003
Master_Info_File: mysql.slave_master_info
SQL_Delay: 0
SQL_Remaining_Delay: NULL
Slave_SQL_Running_State: Slave has read all relay log; waiting for more updates
Master_Retry_Count: 86400
Master_Bind:
Last_IO_Error_Timestamp:
Last_SQL_Error_Timestamp:
Master_SSL_Crl:
Master_SSL_Crlpath:
Retrieved_Gtid_Set:
Executed_Gtid_Set:
Auto_Position: 0
Replicate_Rewrite_DB: (datingCenter_0,matchCenter_0),(userCenter_0,matchCenter_0)
Channel_Name: 2
Master_TLS_Version:
Master_public_key_path:
Get_master_public_key: 0
Network_Namespace:
2 rows in set (0.01 sec)
ERROR:
No query specified
可以看见设置两个个的主从同步通道的所有状态信息。
只有【Slave_IO_Running】和【Slave_SQL_Running】都是Yes，同步才是正常的。
如果是No或者Connecting都不行，可查看mysql-error.log，
可以重启容器试试或者等待一会
若需要单独启动或停止某个同步通道，可使用如下命令：
start slave for channel '300'; //启动名称为300的同步通道
stop slave for channel '300'; //停止名称为300的同步通道
验证数据同步
新建库和表等，会发现同步到了mysql8-3上
第二种情形：
多个主库上的表同步到从库的的一个库里面
- 主库mysql8-1：IP=121.40.110.2; PORT=3310; server-id=1; database=datingcenter； table=aa、dd
- 主库mysql8-2：IP=121.40.110.2; PORT=3311; server-id=2; database=usercenter ；table=cc、bb
- 从库mysql8-3：IP=121.40.110.2; PORT=3312; server-id=3; database=matchcenter ；table=aa、dd、cc、bb
配置文件
【主库mysql8-1】操作及配置
配置my.cnf（/etc/mysql/my.cnf）
取消掉
binlog-do-db = datingcenter
【主库mysql8-2】操作及配置
配置my.cnf（/etc/mysql/my.cnf）
取消掉
binlog-do-db = usercenter
【从库mysql8-3】操作及配置
配置my.cnf（/etc/mysql/my.cnf）
[client] port = 3306 default-character-set = utf8mb4 [mysql] port = 3306 default-character-set = utf8mb4 [mysqld] ########################## # summary ########################## #bind-address = 0.0.0.0 #port = 3306 #datadir=/datavol/mysql/data #数据存储目录 ########################## # log bin ########################## server-id = 3 master_info_repository = table relay_log_info_repository = table replicate-rewrite-db=datingCenter->matchCenter_0 replicate-rewrite-db=userCenter->matchCenter_0 ########################## # character set ########################## character-set-server = utf8mb4 collation-server = utf8mb4_unicode_ci
设置【从库】信息
登录【从库mysql8-3】，进入mysql命令行。
mysql> stop slave; Query OK, 0 rows affected mysql> CHANGE MASTER TO MASTER_HOST='121.40.110.2', MASTER_PORT=3310, MASTER_USER='slave', MASTER_PASSWORD='123456', MASTER_LOG_FILE='mysql-bin.000001', MASTER_LOG_POS=155 for channel '1'; Query OK, 0 rows affected mysql> CHANGE MASTER TO MASTER_HOST='121.40.110.2', MASTER_PORT=3311, MASTER_USER='slave', MASTER_PASSWORD='123456', MASTER_LOG_FILE='mysql-bin.000002', MASTER_LOG_POS=155 for channel '2'; Query OK, 0 rows affected mysql> start slave; Query OK, 0 rows affected
stop slave; //停止同步
start slave; //开始同步
//必须和【主库】的信息匹配。
CHANGE MASTER TO
MASTER_HOST='121.40.110.2 //主库IP
MASTER_PORT=3310, //主库端口
MASTER_USER='slave', //访问主库且有同步复制权限的用户
MASTER_PASSWORD='123456', //登录密码
//【关键处】从主库的该log_bin文件开始读取同步信息，主库show master status返回结果
MASTER_LOG_FILE='mysql-bin.000001',
//【关键处】从文件中指定位置开始读取，主库show master status返回结果
MASTER_LOG_POS=155
for channel '1'; //定义通道名称
查看同步状态
mysql> show slave status G;
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 47.111.132.49
Master_User: slave
Master_Port: 3310
Connect_Retry: 60
Master_Log_File: mysql-bin.000006
Read_Master_Log_Pos: 169442
Relay_Log_File: efe0882a2350-relay-bin-1.000017
Relay_Log_Pos: 169656
Relay_Master_Log_File: mysql-bin.000006
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
Replicate_Do_DB:
Replicate_Ignore_DB:
Replicate_Do_Table:
Replicate_Ignore_Table:
Replicate_Wild_Do_Table:
Replicate_Wild_Ignore_Table:
Last_Errno: 0
Last_Error:
Skip_Counter: 0
Exec_Master_Log_Pos: 169442
Relay_Log_Space: 170040
Until_Condition: None
Until_Log_File:
Until_Log_Pos: 0
Master_SSL_Allowed: No
Master_SSL_CA_File:
Master_SSL_CA_Path:
Master_SSL_Cert:
Master_SSL_Cipher:
Master_SSL_Key:
Seconds_Behind_Master: 0
Master_SSL_Verify_Server_Cert: No
Last_IO_Errno: 0
Last_IO_Error:
Last_SQL_Errno: 0
Last_SQL_Error:
Replicate_Ignore_Server_Ids:
Master_Server_Id: 1
Master_UUID: 399257c7-a933-11e9-8d35-0242ac110002
Master_Info_File: mysql.slave_master_info
SQL_Delay: 0
SQL_Remaining_Delay: NULL
Slave_SQL_Running_State: Slave has read all relay log; waiting for more updates
Master_Retry_Count: 86400
Master_Bind:
Last_IO_Error_Timestamp:
Last_SQL_Error_Timestamp:
Master_SSL_Crl:
Master_SSL_Crlpath:
Retrieved_Gtid_Set:
Executed_Gtid_Set:
Auto_Position: 0
Replicate_Rewrite_DB: (datingCenter_0,matchCenter_0),(userCenter_0,matchCenter_0)
Channel_Name: 1
Master_TLS_Version:
Master_public_key_path:
Get_master_public_key: 0
Network_Namespace:
*************************** 2. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 47.111.132.49
Master_User: slave
Master_Port: 3311
Connect_Retry: 60
Master_Log_File: mysql-bin.000006
Read_Master_Log_Pos: 155
Relay_Log_File: efe0882a2350-relay-bin-2.000019
Relay_Log_Pos: 369
Relay_Master_Log_File: mysql-bin.000006
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
Replicate_Do_DB:
Replicate_Ignore_DB:
Replicate_Do_Table:
Replicate_Ignore_Table:
Replicate_Wild_Do_Table:
Replicate_Wild_Ignore_Table:
Last_Errno: 0
Last_Error:
Skip_Counter: 0
Exec_Master_Log_Pos: 155
Relay_Log_Space: 753
Until_Condition: None
Until_Log_File:
Until_Log_Pos: 0
Master_SSL_Allowed: No
Master_SSL_CA_File:
Master_SSL_CA_Path:
Master_SSL_Cert:
Master_SSL_Cipher:
Master_SSL_Key:
Seconds_Behind_Master: 0
Master_SSL_Verify_Server_Cert: No
Last_IO_Errno: 0
Last_IO_Error:
Last_SQL_Errno: 0
Last_SQL_Error:
Replicate_Ignore_Server_Ids:
Master_Server_Id: 2
Master_UUID: 39a3fc71-a933-11e9-ac19-0242ac110003
Master_Info_File: mysql.slave_master_info
SQL_Delay: 0
SQL_Remaining_Delay: NULL
Slave_SQL_Running_State: Slave has read all relay log; waiting for more updates
Master_Retry_Count: 86400
Master_Bind:
Last_IO_Error_Timestamp:
Last_SQL_Error_Timestamp:
Master_SSL_Crl:
Master_SSL_Crlpath:
Retrieved_Gtid_Set:
Executed_Gtid_Set:
Auto_Position: 0
Replicate_Rewrite_DB: (datingCenter_0,matchCenter_0),(userCenter_0,matchCenter_0)
Channel_Name: 2
Master_TLS_Version:
Master_public_key_path:
Get_master_public_key: 0
Network_Namespace:
2 rows in set (0.01 sec)
ERROR:
No query specified
在datingcenter建立表aa dd usercenter建立表 bb cc
查看同步结果
参考：
https://juejin.im/entry/5bf7731351882518805ac985
https://www.cnblogs.com/zhjh256/p/9260554.html
https://blog.csdn.net/u014520745/article/details/76056170
https://blog.csdn.net/h996666/article/details/80921913
https://blog.csdn.net/sgrrmswtvt/article/details/82344183