MySQl5.6主主復制配置
主主復制即在兩臺MySQL主機內都可以變更數據，而且另外一臺主機也會做出相應的變更。就是將兩個主從復制有機合並起來就好了。只不過在配置的時候我們需要註意一些問題，例如，主鍵重復，server-id不能重復等等。
安裝環境
server-1 IP：192.168.4.58
server-2 IP：192.168.4.88
操作系統CentOS6.8 應用程序MySQL 5.6.40
MySQL安裝步驟
詳細步驟請參考：
[MySQL5.6安裝步驟]
(http://blog.51cto.com/437549/2114513)
配置步驟
1、修改配置文件
server-1（IP：192.168.4.58）
server-id=58 #任意自然是n，只要保證兩臺MySQl主機不重復就行
relay-log=relay-mysql #啟用中繼日誌
relay-log-index=relay-mysql.index
auto-increment-increment=2 #步進值auto_imcrement 一般有n臺主MySQL就填n
auto-increment-offset=1 #起始值。一般填第n臺主MySQL。此時為第一臺主MySQL
server-2（IP：192.168.4.88）
server-id=88
log-bin=mysql-bin
relay-log-index=relay-mysql.index
auto-increment-increment=2
auto-increment-offset=2
註：配置好後重啟MySQL
2、在兩臺服務器上互相創建具有復制權限的用戶
mysql> GRANT REPLICATION SLAVE ON . TO ‘backup‘@‘192.168.4.88‘ IDENTIFIED BY ‘123456‘;
mysql> FLUSH PRIVILEGES;
3、如果此時兩臺服務器均為新建立，且無其它寫入操作，各服務器只需記錄當前自己二進制日誌文件及事件位置，以之作為另外的服務器復制起始位置即可
查看server-1（192.168.4.58）二進制日誌名和位置
mysql> show master status\G;
1. row
File: mysql-bin.000002
Position: 420
Binlog_Do_DB:
Binlog_Ignore_DB:
Executed_Gtid_Set:
1 row in set (0.00 sec)
查看server-1（192.168.4.88）二進制日誌名和位置
mysql> show master status\G;
1. row
File: mysql-bin.000002
Position: 420
Binlog_Do_DB:
Binlog_Ignore_DB:
Executed_Gtid_Set:
1 row in set (0.00 sec)
4、各服務器接下來指定對另一臺服務器為自己的主服務器即可
告知二進制文件名及位置
服務器server-1（ 192.168.4.58）
mysql> change master to master_host=‘192.168.4.88‘,master_user=‘backup‘,master_password=‘123456‘,master_log_file=‘mysql-bin.000002‘,master_log_pos=420;
mysql> start slave; # 啟動從服務器
服務器server-2（ 192.168.4.58）
mysql> change master to master_host=‘192.168.4.58‘,master_user=‘backup‘,master_password=‘123456‘,master_log_file=‘mysql-bin.000002‘,master_log_pos=420;
mysql> start slave; # 啟動從服務器
5、查看主從復制是否成功：
服務器server-1（ 192.168.4.58）
mysql> show slave status\G;
1. row
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.4.88
Master_User: backup
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000002
Read_Master_Log_Pos: 420
Relay_Log_File: relay-mysql.000002
Relay_Log_Pos: 283
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: 420
Relay_Log_Space: 452
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: 88
Master_UUID: 7e7ddde3-4a3b-11e8-8195-000c29f5e0c1
Master_Info_File: /data/mysql/master.info
SQL_Delay: 0
SQL_Remaining_Delay: NULL
Slave_SQL_Running_State: Slave has read all relay log; waiting for the slave I/O thread to update it
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
服務器server-2（ 192.168.4.58）
mysql> show slave status\G;
1. row
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.4.58
Master_User: backup
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000002
Read_Master_Log_Pos: 420
Relay_Log_File: relay-mysql.000002
Relay_Log_Pos: 283
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: 420
Relay_Log_Space: 452
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: 58
Master_UUID: 65930153-383f-11e8-8c4e-000c29138f00
Master_Info_File: /data/mysql/master.info
SQL_Delay: 0
SQL_Remaining_Delay: NULL
Slave_SQL_Running_State: Slave has read all relay log; waiting for the slave I/O thread to update it
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
當看到Slave_IO_Running: YES；Slave_SQL_Running: YES才表明狀態正常
測試結果
在server-1 192.168.4.58上創建
mysql> create database test_db;
mysql> use test_db;
mysql> create table test_tb (
-> id int(3),
-> name varchar(10));
在server-2 192.168.4.58上查看結果：
mysql> show tables;
+-------------------+
| Tables_in_test_db |
+-------------------+
| test_tb |
+-------------------+
server-2 192.168.4.88 自動創建test_db數據庫和 test_tb表，即主從復制成功。
再驗證主主復制
在server-1 192.168.4.58插入數據：
mysql> insert into test_tb (name) values (‘11‘),(‘11‘),(‘11‘);
在server-2 192.168.4.88插入數據：
mysql> insert into test_tb (name) values (‘22‘),(‘22‘),(‘22‘);
查看數據：
mysql> select * from test_tb;
+------+------+
| id | name |
+------+------+
| NULL | 11 |
| NULL | 11 |
| NULL | 11 |
| NULL | 22 |
| NULL | 22 |
| NULL | 22 |
+------+------+
MySQl5.6主主復制配置