mysql中从分离_mysql主从分离搭建

MySQL主从复制原理

主服务器数据库的每次操作都会记录在其二进制文件mysql-bin.xxx(该文件可以在mysql目录下的data目录中看到)中&＃xff0c;从服务器启动一个I/O线程使用专用账号登录到主服务器中读取该二进制文件&＃xff0c;并将文件内容写入到自己本地的中继日志relay-log文件中&＃xff0c;然后从服务器在启动一个SQL线程并根据中继日志中的内容执行SQL语句写入到同步的数据库中.

原理图如下:

重启从节点mysql并配置:

#重启mysql

[root&＃64;localhost mysql]# /etc/init.d/mysql.server restart

Shutting down MySQL.. SUCCESS!

Starting MySQL. SUCCESS!

#登录从节点mysql

[root&＃64;localhost mysql]# /usr/local/mysql/bin/mysql -uroot -p123456

Warning: Using a password on the command line interface can be insecure.

Welcome to the MySQL monitor. Commands end with ; or \g.

Your MySQL connection id is 1

Server version: 5.6.35 MySQL Community Server (GPL)

Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its

affiliates. Other names may be trademarks of their respective

owners.

Type &＃39;help;&＃39; or &＃39;\h&＃39; for help. Type &＃39;\c&＃39; to clear the current input statement.

#设置复制的主节点数据库,pos位置

mysql> CHANGE MASTER TO MASTER_HOST&＃61;&＃39;192.168.1.107&＃39;,MASTER_USER&＃61;&＃39;slave&＃39;,MASTER_PASSWORD&＃61;&＃39;slpass&＃39;,MASTER_LOG_FILE&＃61;&＃39;mysql-bin.000003&＃39;,MASTER_LOG_POS&＃61;0;

Query OK, 0 rows affected, 2 warnings (0.01 sec)

查看从节点状态:

mysql> show slave status\G;

*************************** 1. row ***************************

Slave_IO_State:

Master_Host: 192.168.1.107

Master_User: slave

Master_Port: 3306

Connect_Retry: 60

Master_Log_File: mysql-bin.000003 #复制的二进制文件

Read_Master_Log_Pos: 4 #从哪个pos位置开始复制

Relay_Log_File: relay-log.000001

Relay_Log_Pos: 4

Relay_Master_Log_File: mysql-bin.000003

Slave_IO_Running: No #复制功能还没有启动

Slave_SQL_Running: No #复制功能还没有启动

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: 4

Relay_Log_Space: 120

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: NULL

Master_SSL_Verify_Server_Cert: No

Last_IO_Errno: 1236

Last_IO_Error: Got fatal error 1236 from master when reading data from binary log: &＃39;Could not find first log file name in binary log index file&＃39;

Last_SQL_Errno: 0

Last_SQL_Error:

Replicate_Ignore_Server_Ids:

Master_Server_Id: 1

Master_UUID: 23562d2f-6c4d-11e8-9fbd-000c29f223ba

Master_Info_File: /data/mysql/master.info

SQL_Delay: 0

SQL_Remaining_Delay: NULL

Slave_SQL_Running_State:

Master_Retry_Count: 86400

Master_Bind:

Last_IO_Error_Timestamp: 180610 00:35:58

Last_SQL_Error_Timestamp:

Master_SSL_Crl:

Master_SSL_Crlpath:

Retrieved_Gtid_Set:

Executed_Gtid_Set:

Auto_Position: 0

1 row in set (0.01 sec)

ERROR:

No query specified

开启主从复制并查看状态:

#开启复制功能

mysql> START SLAVE;

Query OK, 0 rows affected (0.00 sec)

mysql> show slave status\G;

*************************** 1. row ***************************

Slave_IO_State: Waiting for master to send event

Master_Host: 192.168.1.107

Master_User: slave

Master_Port: 3306

Connect_Retry: 60

Master_Log_File: mysql-bin.000003

Read_Master_Log_Pos: 430 #已经复制到430的pos了

Relay_Log_File: relay-log.000002

Relay_Log_Pos: 593

Relay_Master_Log_File: mysql-bin.000003

Slave_IO_Running: Yes #复制已经启动

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: 430

Relay_Log_Space: 760

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

Master_UUID: 23562d2f-6c4d-11e8-9fbd-000c29f223ba

Master_Info_File: /data/mysql/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)

ERROR:

No query specified

看到 Slave_IO_Running: Yes 和Slave_SQL_Running: Yes 都是yes了,说明主从复制已经生效了,环境搭建完成.