MySQL 5.7多源复制详解

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MySQL5.7 开始支持多源复制，也就是多主一从的复制架构：

MySQL 5.7 多源复制详解

使用多源复制的考虑：

1、灾备作用：将各个库汇总在一起，就算是其他库都挂了（整个机房都无法连接了），还有最后一个救命稻草；

2、备份：直接在这个从库中做备份，不影响线上的数据库；

3、减少成本：不需要每个库都做一个实例，也减少了 DBA 的维护成本；

4、数据统计：后期的一些数据统计，需要将所有的库汇总在一起。

… …

实验环境：

Master1：10.157.26.132:3307

Master2：10.157.26.133:3307

Slave：10.157.26.134:3307

多源复制是支持 GTID 和 Binlog+Position，我这里是 GTID 复制。

MySQL5.7 的安装这里不再介绍，可以查看

Ubuntu 16.04 上安装 MySQL 5.7 教程 http://www.linuxidc.com/Linux/2017-05/143864.htm

CentOS 7.2 安装 MySQL 5.7.13 http://www.linuxidc.com/Linux/2017-03/141300.htm

CentOS 7 源码安装 MySQL 5.7.17 http://www.linuxidc.com/Linux/2017-02/140133.htm

CentOS 6.6 下 RPM 方式安装 MySQL 5.7.9 http://www.linuxidc.com/Linux/2017-02/140203.htm

一、配置文件：

Master1 和 Master2:

#GTID
gtid-mode = on
binlog_gtid_simple_recovery=1
enforce_gtid_consistency=1
binlog_format = row
skip_slave_start = 1
log-bin = /data/mysql/mysql_3307/logs/binlog/mysql-bin

Slave:

#binlog
binlog_format = row
server-id = 1343307
log-bin = /data/mysql/mysql_3307/logs/binlog/mysql-bin
#GTID
gtid-mode = on
binlog_gtid_simple_recovery=1
enforce_gtid_consistency=1
#修改 MySQL 存储 master-info 和 relay-info 的方式，即从文件存储改为表存储
master_info_repository=TABLE
relay_log_info_repository=TABLE
replicate_ignore_db=mysql  #忽略 mysql 库的同步
skip_slave_start = 1

二、主库创建复制账号：

Master1：grant replication slave,replication client on *.* to sampson_132@'10.157.26.%'identified by 'sampson_132';
Master2：grant replication slave,replication client on *.* to sampson_133@'10.157.26.%'identified by 'sampson_133';

三：从库启动复制：

mysql> change master to master_host='10.157.26.132',master_port=3307,master_user='sampson_132',master_password='sampson_132',master_auto_position=1 for channel 'Master_132';
mysql>change master to master_host='10.157.26.133',master_port=3307,master_user='sampson_133',master_password='sampson_133',master_auto_position=1 for channel 'Master_133';
mysql>start slave;

也可以 start slave for channel ‘Master_132 ‘ 启动单个 channel 的复制。

四：查看 slave 状态

【也可以直接 show slave status for channel ‘Master_132’ \G 查看各个 channel 的复制状态】

mysql> show slave status\G
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 10.157.26.132
                  Master_User: sampson_132
                  Master_Port: 3307
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000001
          Read_Master_Log_Pos: 154
               Relay_Log_File: relay_log-master_132.000002
                Relay_Log_Pos: 367
        Relay_Master_Log_File: mysql-bin.000001
             Slave_IO_Running: Yes
            Slave_SQL_Running: Yes
              Replicate_Do_DB:
          Replicate_Ignore_DB: mysql
           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: 154
              Relay_Log_Space: 579
              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: 1323307
                  Master_UUID: 8785129a-3ace-11e7-9f13-fa163e48cafd
             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: 1
         Replicate_Rewrite_DB:
                 Channel_Name: master_132
           Master_TLS_Version:
*************************** 2. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 10.157.26.133
                  Master_User: sampson_133
                  Master_Port: 3307
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000001
          Read_Master_Log_Pos: 154
               Relay_Log_File: relay_log-master_133.000002
                Relay_Log_Pos: 367
        Relay_Master_Log_File: mysql-bin.000001
             Slave_IO_Running: Yes
            Slave_SQL_Running: Yes
              Replicate_Do_DB:
          Replicate_Ignore_DB: mysql
           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: 154
              Relay_Log_Space: 579
              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: 1333307
                  Master_UUID: 3d5ae510-3acf-11e7-82a4-fa163e8e91ad
             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: 1
         Replicate_Rewrite_DB:
                 Channel_Name: master_133
           Master_TLS_Version:
2 rows in set (0.01 sec)

通过查看 performance_schema 相关的表查看同步状态：

mysql> select * from performance_schema.replication_connection_status\G
*************************** 1. row ***************************
             CHANNEL_NAME: master_132
               GROUP_NAME:
              SOURCE_UUID: 8785129a-3ace-11e7-9f13-fa163e48cafd
                THREAD_ID: 89
            SERVICE_STATE: ON
COUNT_RECEIVED_HEARTBEATS: 1
 LAST_HEARTBEAT_TIMESTAMP: 2017-05-17 16:59:45
 RECEIVED_TRANSACTION_SET:
        LAST_ERROR_NUMBER: 0
       LAST_ERROR_MESSAGE:
     LAST_ERROR_TIMESTAMP: 0000-00-00 00:00:00
*************************** 2. row ***************************
             CHANNEL_NAME: master_133
               GROUP_NAME:
              SOURCE_UUID: 3d5ae510-3acf-11e7-82a4-fa163e8e91ad
                THREAD_ID: 91
            SERVICE_STATE: ON
COUNT_RECEIVED_HEARTBEATS: 1
 LAST_HEARTBEAT_TIMESTAMP: 2017-05-17 16:59:45
 RECEIVED_TRANSACTION_SET:
        LAST_ERROR_NUMBER: 0
       LAST_ERROR_MESSAGE:
     LAST_ERROR_TIMESTAMP: 0000-00-00 00:00:00
2 rows in set (0.01 sec)

五、数据同步检查：

Master1 建库建表并插入数据：

mysql>CREATE DATABASE /*!32312 IF NOT EXISTS*/ `sampson_132` /*!40100 DEFAULT CHARACTER SET utf8mb4 */;
mysql>use sampson_132
mysql> create table t_132(id int primary key auto_increment,name varchar(20) not null);
mysql> insert into t_132(id,name)values(1,'132'),(2,'132'),(3,'132');
mysql> select * from t_132;
+----+------+
| id | name |
+----+------+
|  1 | 132  |
|  2 | 132  |
|  3 | 132  |
+----+------+
3 rows in set (0.00 sec)

Master2 建库建表并插入数据：

mysql> CREATE DATABASE /*!32312 IF NOT EXISTS*/ `sampson_133` /*!40100 DEFAULT CHARACTER SET utf8mb4 */;
mysql> use sampson_133
mysql> create table t_133(id int primary key auto_increment,name varchar(20) not null);
mysql> insert into t_133(id,name)values(1,'133'),(2,'133'),(3,'133');
mysql> select * from sampson_133.t_133;
+----+------+
| id | name |
+----+------+
|  1 | 133  |
|  2 | 133  |
|  3 | 133  |
+----+------+
3 rows in set (0.00 sec)

Slave 查看数据是否同步：

mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
| sampson_132        |
| sampson_133        |
| sys                |
+--------------------+
6 rows in set (0.00 sec)
 
mysql> select * from sampson_132.t_132;
+----+------+
| id | name |
+----+------+
|  1 | 132  |
|  2 | 132  |
|  3 | 132  |
+----+------+
3 rows in set (0.00 sec)
 
mysql> select * from sampson_133.t_133;
+----+------+
| id | name |
+----+------+
|  1 | 133  |
|  2 | 133  |
|  3 | 133  |
+----+------+
3 rows in set (0.00 sec)

再次查看从库状态：

mysql> show slave status\G
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 10.157.26.132
                  Master_User: sampson_132
                  Master_Port: 3307
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000001
          Read_Master_Log_Pos: 930
               Relay_Log_File: relay_log-master_132.000002
                Relay_Log_Pos: 1143
        Relay_Master_Log_File: mysql-bin.000001
             Slave_IO_Running: Yes
            Slave_SQL_Running: Yes
              Replicate_Do_DB:
          Replicate_Ignore_DB: mysql
           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: 930
              Relay_Log_Space: 1355
              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: 1323307
                  Master_UUID: 8785129a-3ace-11e7-9f13-fa163e48cafd
             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: 8785129a-3ace-11e7-9f13-fa163e48cafd:1-3
            Executed_Gtid_Set: 3d5ae510-3acf-11e7-82a4-fa163e8e91ad:1-3,
8785129a-3ace-11e7-9f13-fa163e48cafd:1-3
                Auto_Position: 1
         Replicate_Rewrite_DB:
                 Channel_Name: master_132
           Master_TLS_Version:
*************************** 2. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 10.157.26.133
                  Master_User: sampson_133
                  Master_Port: 3307
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000001
          Read_Master_Log_Pos: 930
               Relay_Log_File: relay_log-master_133.000002
                Relay_Log_Pos: 1143
        Relay_Master_Log_File: mysql-bin.000001
             Slave_IO_Running: Yes
            Slave_SQL_Running: Yes
              Replicate_Do_DB:
          Replicate_Ignore_DB: mysql
           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: 930
              Relay_Log_Space: 1355
              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: 1333307
                  Master_UUID: 3d5ae510-3acf-11e7-82a4-fa163e8e91ad
             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: 3d5ae510-3acf-11e7-82a4-fa163e8e91ad:1-3
            Executed_Gtid_Set: 3d5ae510-3acf-11e7-82a4-fa163e8e91ad:1-3,
8785129a-3ace-11e7-9f13-fa163e48cafd:1-3
                Auto_Position: 1
         Replicate_Rewrite_DB:
                 Channel_Name: master_133
           Master_TLS_Version:
2 rows in set (0.00 sec)