基本环境
| Master1 | Master2 | Slave | |
| MySQL版本 | MySQL-5.7.16-X86_64 | MySQL-5.7.16-X86_64 | MySQL-5.7.16-X86_64 |
| IP | 192.168.56.156 | 192.168.56.156 | 192.168.56.157 |
| Port | 3306 | 3307 | 3306 |
数据库环境的部署：
两边安装好相同的数据库软件，初始化，可以启动起来。
检查事项：
两边防火墙是否开启，对应的端口号是否通（可以通过telnet的方式，或者远程登录的方式验证）
每个实例上DB名字不能一样。
创建或是复制用户时名字不能一样，如果经常遇到一样的帐号若是为了规范创建的帐号是一样的，考虑在slave的过滤规则把mysql复制忽略掉。
多源复制是支持GTID和Binlog+Position。推荐使用GTID的方式。
主库Master1配置：
开启 log_bin 、server_id、gtid_mode、enforce_gtid_consistency、skip-slave-start、log_slave_updates 参数。
server_id=15633006
gtid_mode=on
enforce_gtid_consistency=1
skip-slave-start=1
log_slave_updates=1
主库Master2配置：
开启 log_bin 、server_id、gtid_mode、enforce_gtid_consistency、skip-slave-start、log_slave_updates 参数。
server_id=15633007
gtid_mode=on
enforce_gtid_consistency=1
skip-slave-start=1
log_slave_updates=1
另外需要注意的是：
binlog_format 控制二进制文件格式，生成环境建议使用row格式。
log_bin_basename 控制二进制文件的路径和命名规则。
server_id建议使用：端口号+IP最后一位的形式。
主库Master1和Master2创建复制账号：
create user 'repl'@'192.168.56.%' identified by 'oracle';
grant replication slave on *.* to 'repl'@'192.168.56.%';
flush privileges;
创建完之后，在另外一台服务器测试是否能连接上。
mysql -h 192.168.56.156 -urepl -p
从库配置：
开启 log_bin 、server_id、gtid_mode、enforce_gtid_consistency、skip-slave-start、log_slave_updates 参数。
server_id=15733006
gtid_mode=on
enforce_gtid_consistency=1
skip-slave-start=1
log_slave_updates=1
master_info_repository =table
relay_log_info_repository =table
注意：主库和从库的server_id不能一样。
mysql> show master status G;
*************************** 1. row ***************************
File: mysql-bin.000005
Position: 194
Binlog_Do_DB:
Binlog_Ignore_DB:
Executed_Gtid_Set: b16b53da-c1a1-11e6-915f-000c29355816:1-21
1 row in set (0.02 sec)
在从库上执行：
change master to master_host='192.168.56.156',master_user='repl',master_password='oracle',master_port=3306,MASTER_AUTO_POSITION = 1 for channel 'master-1563306';
change master to master_host='192.168.56.156',master_user='repl',master_password='oracle',master_port=3307,MASTER_AUTO_POSITION = 1 for channel 'master-1563307';
在从库上执行：
mysql> start slave;
Query OK, 0 rows affected (0.01 sec)
在从库上查看状态：
mysql> show slave status G;
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.56.156
Master_User: repl
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000002
Read_Master_Log_Pos: 769
Relay_Log_File: relay-bin-master@002d1563306.000002
Relay_Log_Pos: 414
Relay_Master_Log_File: mysql-bin.000002
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: 769
Relay_Log_Space: 634
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: 1563306
Master_UUID: a7d97e64-ded9-11e6-8a38-000c29355816
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: 124a7ca4-ded9-11e6-9d8d-000c29355816:1-7,
2002367e-deda-11e6-a0de-000c299e3b2b:1,
a7d97e64-ded9-11e6-8a38-000c29355816:1-3
Auto_Position: 1
Replicate_Rewrite_DB:
Channel_Name: master-1563306
Master_TLS_Version:
*************************** 2. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.56.156
Master_User: rep2
Master_Port: 3307
Connect_Retry: 60
Master_Log_File: mysql-bin.000002
Read_Master_Log_Pos: 1549
Relay_Log_File: relay-bin-master@002d1563307.000002
Relay_Log_Pos: 1762
Relay_Master_Log_File: mysql-bin.000002
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: 1549
Relay_Log_Space: 1982
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: 1563307
Master_UUID: 124a7ca4-ded9-11e6-9d8d-000c29355816
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: 124a7ca4-ded9-11e6-9d8d-000c29355816:1-7
Executed_Gtid_Set: 124a7ca4-ded9-11e6-9d8d-000c29355816:1-7,
2002367e-deda-11e6-a0de-000c299e3b2b:1,
a7d97e64-ded9-11e6-8a38-000c29355816:1-3
Auto_Position: 1
Replicate_Rewrite_DB:
Channel_Name: master-1563307
Master_TLS_Version:
2 rows in set (0.00 sec)
关注上面 Slave_IO_Running 和 Slave_SQL_Running都是 Yes，表示已经连接上了master，说明已经成功。