[学习笔记]mysql主从配置
环境：2台虚拟机 centos X64 已经编译安装好了lamp
master:
1.编辑my.cnf文件在[mysqld]下添加2行参数
(2行参数一定要放在mysqld下 否则会出错)
server-id = 1
log-bin = /data/3307/mysql-bin
重启mysql！
2.创建用于同步的用户
进入主数据库执行命令：
mysql> grant replication slave on *.* to 'rep'@'192.168.137.%' identified by "pizize";
(
#replication slave 为mysql同步的必须权限。
#*表示所有表和库
#'rep'@'192.168.137.%' rep为同步账号。192.168.137.%表示允许整个137网段的IP都可以访问
)
对数据库锁表只读
mysql> flush tables with read lock;
(锁表后，不能再创建表，也不能插入数据，锁表命令时间会受下面参数控制，若果超过设置时间不操作会自动解锁
interactive_timeout = 60
wait_timeout = 60
查看默认时长(秒)：mysql> show variables like '%timeout%';
解锁命令：unlock tables;
)
锁表后用show master status; 查看主库的日志文件名和偏移量
+------------------+----------+--------------+------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+------------------+----------+--------------+------------------+
| mysql-bin.000001 | 106 | | |
+------------------+----------+--------------+------------------+
slave
3.导出数据库 把它传入从库
编辑my.cnf 设置server-id的值并关闭binlog设置
如果数据库以前配置过主从 那么要先执行 stop slave;否则就会报错
mysql> CHANGE MASTER TO
-> MASTER_HOST='192.168.137.112',
-> MASTER_PORT=3307,
-> MASTER_USER='rep',
-> MASTER_PASSWORD='pizize',
-> MASTER_LOG_FILE='mysql-bin.000001'
-> MASTER_LOG_POS=106;
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'MASTER_LOG_POS=106' at line 7
mysql> stop slave;
Query OK, 0 rows affected, 1 warning (0.00 sec)
mysql> CHANGE MASTER TO MASTER_HOST='192.168.137.112', MASTER_PORT=3307, MASTER_USER='rep', MASTER_PASSWORD='pizize', MASTER_LOG_FILE='mysql-bin.000001', MASTER_LOG_POS=106;
Query OK, 0 rows affected (0.03 sec)
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: 192.168.137.112
Master_User: rep
Master_Port: 3307
Connect_Retry: 60
Master_Log_File: mysql-bin.000002
Read_Master_Log_Pos: 106
Relay_Log_File: lamp113-relay-bin.000003
Relay_Log_Pos: 251
Relay_Master_Log_File: mysql-bin.000002
Slave_IO_Running: Yes #IO线程请求日志。sql线程表示应用日志。
Slave_SQL_Running: Yes #当这2个项为yes时，表示主从配置成功。
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: 106
Relay_Log_Space: 553
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 #这个数字如果不为0的话，表示主库和从库有延迟
Master_SSL_Verify_Server_Cert: No
Last_IO_Errno: 0
Last_IO_Error:
Last_SQL_Errno: 0
Last_SQL_Error:
1 row in set (0.00 sec)
倒库完成发现没问题之后再到主库解锁，unlock tables;
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