CentOS MySQL Master Master Replication配置

1、前期准备：

   A、安装Linux（CentOS系统），MySQL相关软件，本文使用CentOS自带系统。

   B、CentOS-Master1(IP:192.168.227.128),CentOS-Master2(IP:192.168.227.129)两个系统上均关闭防火墙

2、配置MM模式：

   A、在Master1上修改MySQL配置文件（/etc/my.cnf）追加内容如下:

      server-id=1
      master-host=192.168.227.129
      master-user=repl
      master-password=123456
      master-port=3306
      master-connect-retry=60
      log-bin=mysql-bin
      binlog-do-db=test

     并进入MySQL的shell做如下操作：

 mysql> grant replication slave on *.* to identified by '123456';

      mysql> show master status;
+------------------+----------+--------------+------------------+
| File             | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+------------------+----------+--------------+------------------+
| mysql-bin.000014 |      782 | test         |                  |
+------------------+----------+--------------+------------------+
1 row in set (0.00 sec)

注：红色字体部分要在Master2上做Chang Master to操作时使用。

mysql> change master to

master_host='192.168.227.129',master_user='repl',master_password='123456',master_log_file='mysql-bin.000009',master_log_pos='1466'

mysql> stop slave;

 

mysql> show slave status\G
*************************** 1. row ***************************
             Slave_IO_State: Waiting for master to send event
                Master_Host: 192.168.227.129
                Master_User: repl
                Master_Port: 3306
              Connect_Retry: 60
            Master_Log_File: mysql-bin.000009
        Read_Master_Log_Pos: 1466
             Relay_Log_File: mysqld-relay-bin.000005
              Relay_Log_Pos: 235
      Relay_Master_Log_File: mysql-bin.000009
           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: 1466
            Relay_Log_Space: 235
            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
1 row in set (0.00 sec)

mysql>

   B、在Master2上修改MySQL配置文件（/etc/my.cnf）追加内容如下：
      server-id=2
      master-host=192.168.227.128
      master-user=repl
      master-password=123456
      master-port=3306
      master-connect-retry=60
      log-bin=mysql-bin
      binlog-do-db=test

      并进入MySQL的shell进行如下操作：

     mysql> show master status;
+------------------+----------+--------------+------------------+
| File             | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+------------------+----------+--------------+------------------+
| mysql-bin.000009 | 1466     | test         |                  |
+------------------+----------+--------------+------------------+
1 row in set (0.00 sec)

注：红字部分要在Master1上做Chang Master to操作时使用,

在MySQL的shell上做如下操作：

mysql> grant replication slave on *.* to identified by '123456';

mysql> change master to

master_host='192.168.227.128,master_user='repl',master_password='123456',master_log_file='mysql-bin.0000014',master_log_pos='782'

mysql> stop slave;

mysql> show slave status\G
*************************** 1. row ***************************
             Slave_IO_State: Waiting for master to send event
                Master_Host: 192.168.227.128
                Master_User: repl
                Master_Port: 3306
              Connect_Retry: 60
            Master_Log_File: mysql-bin.000014
        Read_Master_Log_Pos: 782
             Relay_Log_File: mysqld-relay-bin.000006
              Relay_Log_Pos: 235
      Relay_Master_Log_File: mysql-bin.000014
           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: 782
            Relay_Log_Space: 235
            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
1 row in set (0.00 sec)

mysql>

注：以上操作步骤中的信息是操作后才总结的，信息有不匹配的地方。

配置思想总结：

在Node1修改配置信息，并获取Mysql的master status信息，在Node2上使用Node1上的master status信息进行Chang Master to操作，执行show processlist\G及show slave status\G以确认是否正确启动。

在Node2修改配置信息，并获取Mysql的master status信息，在Node1上使用Node2上的master status信息进行Chang Master to操作，执行show processlist\G及show slave status\G以确认是否正确启动。

常见错误说明：

Slave_IO_State: Waiting for master to send event（表示已经正确连接上了）

                为空表示复制没有启动。

                为Connecting to master为没连接上master

mysql> show slave status\G
  Slave_IO_Running: Yes
  Slave_SQL_Running: Yes
此两项线程显示为yes则正常！

注：配置操作期间参考很多网上资料在此表示感谢。