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