Mysql中怎么创建数据库并配置主从
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1、主服务器上创建一个用于复制的账户。
mysql> GRANT REPLICATION SLAVE ON *.* TO 'repl'@'192.168.101.3' IDENTIFILED BY 'Mysqlrepl';
mysql> flush privileges;
2、主服务器参数修改
[root@localhost ~]# vi /usr/my.cnf
修改如下内容
server-id = 1
log-bin=mysql-bin
3、主服务器备份数据，并传输
mysql> flush tables with read lock;
mysql> show master status;
+------------------+----------+--------------+------------------+-------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+------------------+----------+--------------+------------------+-------------------+
| mysql-bin.00002 | 120 | | | |
+------------------+----------+--------------+------------------+-------------------+
1 row in set (0.00 sec)
[root@localhost ~]# mysqldump -uroot -p --all-databases | gzip > export_t.sql.gz
[root@localhost ~]# scp export_t.sql.gz root@192.168.101.3:/tmp/
mysql> unlock tables;
4、从服务器恢复数据
[root@localhost bin]# gunzip export_t.sql.gz
[root@localhost bin]# mysql -uroot -p
mysql> source /tmp/export_t.sql.gz;
5、修改从服务器配置
[root@localhost bin]# vi /usr/my.cnf
添加如下内容
server-id = 2
重启服务器
[root@localhost ~]# service mysql restar
6、从服务器设置主从配置
mysql> CHANGE MASTER TO
-> MASTER_HOST='192.168.101.5',
-> MASTER_USER='repl',
-> MASTER_PASSWORD='Mysqlrepl',
-> MASTER_LOG_FILE='mysql-bin.00002',
-> MASTER_PORT=3306,
-> MASTER_LOG_POS=120;
MASTER_HOST指的是主服务器的IP地址，
MASTER_USER指的是复制的账户
MASTER_PASSWORD指的是账户的密码
MASTER_PORT指的是主服务器端口
MASTER_LOG_FILE指的是bin-log的文件
MASTER_LOG_POS指的是日志文件位
7、从服务器启动slave线程
mysql> start slave;
mysql> show processlist;
+----+-------------+-----------+------+---------+------+-----------------------------------------------------------------------------+------------------+-----------+---------------+
| Id | User | Host | db | Command | Time | State | Info | Rows_sent | Rows_examined |
+----+-------------+-----------+------+---------+------+-----------------------------------------------------------------------------+------------------+-----------+---------------+
| 1 | system user | | NULL | Connect | 714 | Slave has read all relay log; waiting for the slave I/O thread to update it | NULL | 0 | 0 |
| 2 | system user | | NULL | Connect | 714 | Waiting for master to send event | NULL | 0 | 0 |
| 4 | root | localhost | NULL | Query | 0 | init | show processlist | 0 | 0 |
+----+-------------+-----------+------+---------+------+-----------------------------------------------------------------------------+------------------+-----------+---------------+
3 rows in set (0.08 sec)
这已经表明主从已经搭建成功。
8、测试
主服务器中
mysql> use test
Database changed
mysql> select * from aaa;
+------+------+
| a | b |
+------+------+
| 1 | 2 |
| 1 | 2 |
| 1 | 2 |
| 2 | 3 |
| 2 | 7 |
+------+------+
5 rows in set (0.06 sec)
从服务器中
mysql> use test;
Database changed
mysql> select * from aaa;
+------+------+
| a | b |
+------+------+
| 1 | 2 |
| 1 | 2 |
| 1 | 2 |
| 2 | 3 |
| 2 | 7 |
+------+------+
5 rows in set (0.21 sec)
主服务器中
mysql> insert into aaa values (5,7),(56,21);
Query OK, 2 rows affected (0.21 sec)
Records: 2 Duplicates: 0 Warnings: 0
mysql> select * from aaa;
+------+------+
| a | b |
+------+------+
| 1 | 2 |
| 1 | 2 |
| 1 | 2 |
| 2 | 3 |
| 2 | 7 |
| 5 | 7 |
| 56 | 21 |
+------+------+
7 rows in set (0.00 sec)
从服务器中
mysql> select * from aaa;
+------+------+
| a | b |
+------+------+
| 1 | 2 |
| 1 | 2 |
| 1 | 2 |
| 2 | 3 |
| 2 | 7 |
| 5 | 7 |
| 56 | 21 |
+------+------+
7 rows in set (0.00 sec)
9、管理主从
查看从服务器状态
mysql> show slave status \G;
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.101.5
Master_User: repl
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.00002
Read_Master_Log_Pos: 120
Relay_Log_File: localhost-relay-bin.000001
Relay_Log_Pos: 283
Relay_Master_Log_File: mysql-bin.000036
Slave_IO_Running: Yes
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: 120
Relay_Log_Space: 460
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: 86d34969-fa5d-11e6-b372-000c29c88c3f
Master_Info_File: /usr/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)
关心的两个信息是Slave_IO_Running和Slave_SQL_Running是否是YES。Slave_IO_Running是从主服务器读取BINLOG日志，并写入到从服务器的中继日志中；Slave_SQL_Running负责读取和执行中继日志信息。
注意：如果需要从服务器禁止写入操作，则需要更改参数read-only，使从服务器非root账户只能读数据。
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