MySQL主主复制（双主复制）配置过程介绍

一、修改配置文件my.cnf
服务器A（172.16.16.70）配置如下
server_id = 70
socket = /tmp/mysql.sock
innodb_buffer_pool_size = 10G
character-set-server=utf8
log_bin=mysql-bin
expire_logs_days=3
replicate-do-db=ixinnuo_sjcj
binlog-ignore-db=mysql,information_schema
auto-increment-increment = 2
auto-increment-offset = 1

服务器B（172.16.16.71）配置如下:
server_id = 71
socket = /tmp/mysql.sock
innodb_buffer_pool_size = 10G
character-set-server=utf8
log_bin=mysql-bin
expire_logs_days=3
replicate-do-db=ixinnuo_sjcj
replicate-ignore-db = mysql,information_schema
auto-increment-increment = 2
auto-increment-offset = 2

两台服务器都重启，使配置生效:
# service mysqld restart

说明:auto-increment-offset是用来设定数据库中自动增长的起点的，回为这两台服务器都设定了一次自动增长值2，所以它们的起点必须要不同，这样才能避免两台服务器数据同步时出现主键冲突.
replicate-do-db 指定同步的数据库，本例为ixinnuo_sjcj库，另外，建议两台服务器的硬件配置也都一样。

二、同步数据,建立复制账号:

在服务器A（172.16.16.70）上:
mysql> GRANT REPLICATION SLAVE ON *.* TO 'slave'@'172.16.16.71' IDENTIFIED BY '123456';
Query OK, 0 rows affected (0.00 sec)

mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)

在服务器B（172.16.16.71）上:
mysql> GRANT REPLICATION SLAVE ON *.* TO 'slave'@'172.16.16.70' IDENTIFIED BY '123456';
Query OK, 0 rows affected (0.00 sec)

mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)

三、执行change master命令同步:
在服务器A（172.16.16.70）上:
mysql> show master status;
+------------------+----------+--------------+--------------------------+-------------------+
| File             | Position | Binlog_Do_DB | Binlog_Ignore_DB         | Executed_Gtid_Set |
+------------------+----------+--------------+--------------------------+-------------------+
| mysql-bin.000047 |      411 |              | mysql,information_schema |                   |
+------------------+----------+--------------+--------------------------+-------------------+
1 row in set (0.00 sec)

在服务器B（172.16.16.71）上:
mysql> show master status;
+------------------+----------+--------------+------------------+-------------------+
| File             | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+------------------+----------+--------------+------------------+-------------------+
| mysql-bin.000003 |      618 |              |                  |                   |
+------------------+----------+--------------+------------------+-------------------+
1 row in set (0.00 sec)

在服务器A上执行:
mysql> change master to master_host='172.16.16.71',master_user='slave',master_password='123456',master_log_file='mysql-bin.000003',master_log_pos=618;
Query OK, 0 rows affected, 2 warnings (0.29 sec)

在服务器B上执行:
mysql> change master to master_host='172.16.16.70',master_user='slave',master_password='123456',master_log_file='mysql-bin.000047',master_log_pos=411;
Query OK, 0 rows affected, 2 warnings (0.34 sec)

在两服务器都执行以下命令:
mysql> start slave;
Query OK, 0 rows affected (0.02 sec)

四.查看状态:

A服务器（172.16.16.70）状态如下：
mysql> show slave status\G
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 172.16.16.71
                  Master_User: slave
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000003
          Read_Master_Log_Pos: 618
               Relay_Log_File: localhost-relay-bin.000002
                Relay_Log_Pos: 283
        Relay_Master_Log_File: mysql-bin.000003
             Slave_IO_Running: Yes
            Slave_SQL_Running: Yes
              Replicate_Do_DB: ixinnuo_sjcj
          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: 618
              Relay_Log_Space: 460
              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: 71
                  Master_UUID: 32197cd9-2957-11e7-a5c4-525400e493a4
             Master_Info_File: /usr/local/mysql/data/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
1 row in set (0.00 sec)

B服务器（172.16.16.71）状态如下：
mysql> show slave status\G
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 172.16.16.70
                  Master_User: slave
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000047
          Read_Master_Log_Pos: 411
               Relay_Log_File: localhost-relay-bin.000002
                Relay_Log_Pos: 283
        Relay_Master_Log_File: mysql-bin.000047
             Slave_IO_Running: Yes
            Slave_SQL_Running: Yes
              Replicate_Do_DB: ixinnuo_sjcj
          Replicate_Ignore_DB: mysql,information_schema
           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: 411
              Relay_Log_Space: 460
              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: 70
                  Master_UUID: f1366940-266c-11e7-92c2-525400f39f79
             Master_Info_File: /usr/local/mysql/data/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
1 row in set (0.00 sec)

说明已经配置成功了

测试:
在服务器A(172.16.16.70)上ixinnuo_sjcj库里创建表chenfeng:

mysql> use ixinnuo_sjcj
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed

mysql> create table chenfeng (name varchar(10));
Query OK, 0 rows affected (0.23 sec)

mysql> insert into chenfeng values('duansf');
Query OK, 1 row affected (0.13 sec)

mysql> insert into chenfeng values('liuyb');
Query OK, 1 row affected (0.02 sec)

在服务器B上查看服务器A上创建的表chenfeng
mysql> select * from chenfeng;
+--------+
| name   |
+--------+
| duansf |
| liuyb  |
+--------+
2 rows in set (0.00 sec)

mysql> desc chenfeng;
+-------+-------------+------+-----+---------+-------+
| Field | Type        | Null | Key | Default | Extra |
+-------+-------------+------+-----+---------+-------+
| name  | varchar(10) | YES  |     | NULL    |       |
+-------+-------------+------+-----+---------+-------+
1 row in set (0.00 sec)

在服务器B(172.16.16.71)上ixinnuo_sjcj库里创建表duansf:

mysql> create table duansf (name varchar(20));
Query OK, 0 rows affected (0.18 sec)

mysql> insert into duansf values('duansf');
Query OK, 1 row affected (0.02 sec)

mysql> insert into duansf values('liuky');
Query OK, 1 row affected (0.03 sec)

在服务器上A上查看服务器B上创建的表duansf
mysql> select * from duansf;
+--------+
| name   |
+--------+
| duansf |
| liuky  |
+--------+
2 rows in set (0.00 sec)

mysql> desc duansf;
+-------+-------------+------+-----+---------+-------+
| Field | Type        | Null | Key | Default | Extra |
+-------+-------------+------+-----+---------+-------+
| name  | varchar(20) | YES  |     | NULL    |       |
+-------+-------------+------+-----+---------+-------+
1 row in set (0.00 sec)

测试成功，说明MySQL主主复制配置成功.

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