MySQL主从复制的配置及原理

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MySQL 5.5   环境用的数据库可的多实例

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mysql 主从复制原理图

mysql 主从复制开始配置  环境是一个数据库多个实例 3306端口为主 3307端口为从

1 开始配置主库和从库的my.cnf配置文件

配置主数据库的my.cnf文件（3306）

server-id       = 1

log-bin=mysql-bin
配置从数据库的my.cnf文件（3307）

server-id       = 2

#log-bin=mysql-bin

然后重启数据库

2登录主数据库给从数据库分配权限用户

grant replication slave on *.* to 'repl'@'192.168.1.17' identified by '123456';

3 锁表并且导出主库里的数据

 flush table with read lock;

show master status;查看bin-log的位置状态

+------------------+----------+--------------+------------------+
| File             | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+------------------+----------+--------------+------------------+
| mysql-bin.000009 |      264 |              |                  |
+------------------+----------+--------------+------------------+

/usr/local/mysql/bin/mysqldump  -uroot -plampol -S /tmp/mysql3306.sock --events  -A  -B > /tmp/master.sql;

4 进从数据库导入主数据库的数据

source /tmp/master.sql

5进从库执行

change master to master_host='192.168.1.17',
      master_port=3306,
      master_user='repl',
      master_password='123456',
      master_log_file='mysql-bin.000009',
      master_log_pos=264;

6 从库开启同步开关 start slave

• show slave status \G;
  *************************** 1. row ***************************
                 Slave_IO_State: Waiting for master to send event
                    Master_Host: 192.168.1.17
                    Master_User: repl
                    Master_Port: 3306
                  Connect_Retry: 60
                Master_Log_File: mysql-bin.000009
            Read_Master_Log_Pos: 500
                 Relay_Log_File: bogon-relay-bin.000002
                  Relay_Log_Pos: 489
          Relay_Master_Log_File: mysql-bin.000009
               Slave_IO_Running: Yes
              Slave_SQL_Running: Yes  //两个yes就ok了主从配置成功
                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: 500
                Relay_Log_Space: 645
                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: 1