mysql主主复制

主主复制原理：

在这篇文章( http://www.cnblogs.com/whereareyoufrom/p/5240380.html )中讲解主从复制的原理，而主主复制的原理更加简单，只需要将主从复制中master的配置操作再在slave中配置一遍，将slave的配置操作在master中配置一遍即可。

配置：

salve配置（将slave配置成master）：

1.修改slave mysql配置文件，加入如下内容

server-id=2
log-bin=mysqlbinlog  #开始binlog，binlog文件命名为mysqlbinlog
binlog_format=fixed  #binlog格式

binlog-do-db=mydata
#binlog-ignore-db=xxx
auto-increment-offset=2
auto-increment-increment=2

2.创建binlog操作用户

>>> create user replicator@'%' identified by 'xxxxxx';
>>> grant replication slave on *.* to 'replicator'@'%' identified by 'xxxxxx';
>>> flush privileges;

3.查看binlog文件名和文件指针位置

>>> show master status;
+--------------------+----------+--------------+------------------+
| File               | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+--------------------+----------+--------------+------------------+
| mysqlbinlog.000001 |      245 | mydata       |                  |
+--------------------+----------+--------------+------------------+
1 row in set (0.00 sec)

master 配置（将master配置成slave）：

1.修改master 配置文件(重启mysql)

replicate-do-db=mydata

2.配置binlog文件信息

>>> change master to
master_host='192.168.252.18',
master_user='replicator',
master_password='xxxxx',
master_log_file='mysqlbinlog.000001',
master_log_pos='245';
>>> start slave;
>>> show slave status;
MariaDB [mydata]> show slave status\G;
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 192.168.252.18
                  Master_User: replicator
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysqlbinlog.000001
          Read_Master_Log_Pos: 1157
               Relay_Log_File: mariadb-relay-bin.000002
                Relay_Log_Pos: 1078
        Relay_Master_Log_File: mysqlbinlog.000001
             Slave_IO_Running: Yes
            Slave_SQL_Running: Yes
              Replicate_Do_DB: mydata
          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: 1157
              Relay_Log_Space: 1374
              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: 2
1 row in set (0.00 sec)

ERROR: No query specified
slave 两个线程启动正确。o啦