mysql权限管理

Facebook使用了GTID

一个实例多个库

show privileges;

给开发一个账号

CRUD

grant select,insert,update,delete on dnname.* to ‘username‘@‘192.168.0.%‘;

help create user;

用户名长度 8-16字符

密码 8-20字符

create user ‘app_dev‘@‘%‘ identified by ‘a1‘;

create user ‘app_dev‘@‘192.168.0.%‘ identified by ‘a2‘;

create user ‘app_dev‘@‘192.168.0.101‘ identified by ‘a3‘;

精确匹配

create user ‘test‘@‘192.168.0.%‘ identified by ‘123456‘;

查看有多少账号

mysql> select user,host from mysql.user;

+------------+--------------+

| user       | host         |

+------------+--------------+

| ‘test’     | 192.168..0.% |

| test       | 192.168.0.%  |

| ‘test’     | 192.168.0.%  |

| mysql.sys  | localhost    |

| root       | localhost    |

+------------+--------------+

5 rows in set (0.00 sec)

select user(),current_user();

desc information_schema.processlist;

show processlist;

select host from information_schema.processlist;

查看那台机器及连接数

select host, current_connections from sys.host_summary;

select substring_index(host,":",1),count(*) as conn from information_schema.processlist group by substring_index(host,":",1);

假设： DB里有20个前端连接

拒接某个连接

[email protected]‘192.168.0.%‘;

192.168.0.101 app_dev

精确匹配

create user ‘app_dev‘@‘192.168.0.101‘ identified by ‘aa‘;

select user,host,authentication_string from mysql.user where user=‘test‘;

删除用户

drop user ‘app_dev‘@‘192.168.0.101‘ and host=‘192.168.0.%‘;

flush privileges;

delete from mysql.user where user=‘test‘ and host=‘192.168.0.%‘;

flush privileges;

flush full privileges;

mysql用户名root、密码忘记解决方法

修改配置文件

my.cnf

[mysqld]

skip-grant-tables

mysql --defaults-file=/path/my.cnf --skip-grant-tables  &

service mysqld restart

set password

或者

update mysql.user set authentication_string=password(‘wubxwubx‘) where user=‘root‘ and host=‘localhost‘;

#小心执行

flush tables;

flush logs

#kill -HUP 8462 测试环境

cat /etc/init.d/mysql | grep kill

mysql schema怎么回事？

在db里面代表一个库