mysql- Management Commands create user authorization, change your password, delete users and authorization, forget the root password]

First, create a user

command:

CREATE USER 'username'@'host' IDENTIFIED BY 'password';

Key Parameters :

　　username - create a login user name,

　　host - Specifies that the user can log on which host, the local user can localhost, let the user can log in from any remote host, you can use wildcards %.

　　password - the user's login password, the password can be empty, if empty then the user can log in without a password server .

example:

CREATE USER 'code'@'localhost' IDENTIFIED BY '123456'; 
CREATE USER 'code'@'192.168.1.101_' IDENDIFIED BY '123456'; 
CREATE USER 'code'@'%' IDENTIFIED BY '123456'; 
CREATE USER 'code'@'%' IDENTIFIED BY ''; 
CREATE USER 'code'@'%';

Second, to authorized users

command:

GRANT privileges ON databasename.tablename TO 'username'@'host';

Key Parameters :

　　privileges: the user's operating authority, such as SELECT, INSERT, UPDATE, etc. If you want to grant permissions is to use ALL
　　DatabaseName: database name, * on behalf of all database
　　tablename: table name, if you want to give the user all databases and tables * available respective operating authority is represented as *. *

　　host - Specifies that the user can log on which host, the local user can localhost, let the user can log in from any remote host, you can use wildcards %.

　　password - the user's login password, the password can be empty, if empty then the user can log in without a password server .

example:

GRANT SELECT, INSERT ON test.user TO 'code'@'%';
GRANT ALL ON *.* TO 'code'@'%';
GRANT ALL ON maindataplus.* TO 'code'@'%';

Note:
authorization by the above command is not authorized users to other users, the user may want if authorized by the authorized user to cancel the command :( other rights authorized users)
the GRANT privileges the ON databasename.tablename the TO 'username' @ 'Host 'WITH GRANT OPTION;

Third, change passwords

command:

The SET PASSWORD the FOR  ' username ' @ ' Host '  = PASSWORD ( ' NewPassword ' ); 
- if the user is currently logged on with: 
the SET PASSWORD = PASSWORD ( 'NewPassword ");

example:

SET PASSWORD FOR 'code'@'%' = PASSWORD("123456");

Fourth, revoke user privileges
command:

REVOKE privilege ON databasename.tablename FROM 'username'@'host';

Key Parameter Description :
Privilege, DatabaseName, TableName: with the authorization section

example:

REVOKE SELECT ON *.* FROM 'code'@'%';

Note:
If you are a user 'code' @ '%' is authorized when such (or similar):

GRANT SELECT ON test.user TO 'code' @ '%', then use REVOKE SELECT ON * * FROM 'code' @ '%';. Does not revoke the command SELECT test user in the user table of the database operation.

Conversely, if the authorization to use the GRANT SELECT ON * * TO 'code' @ '%';. The REVOKE SELECT ON test.user FROM 'code' @ '%'; command the user can not withdraw the test database the user table the Select permission.

Specific information may command SHOW GRANTS FOR 'code' @ '%'; View.

V. delete user
command:

DROP USER 'username'@'host';

Six, forget the root password

1, modify the database Mysql my.cnf configuration

# We /etc/my.cnf

　　In paragraph [mysqld] plus one: skip-grant-tables, save and exit;

[mysqld] 
......
datadir=/var/lib/mysql 
socket=/var/lib/mysql/mysql.sock 
skip-grant-tables

2. Restart mysqld services

# systemctl restart mysqld

4. Log mysql modify the root password

[root@localhost /]# mysql
......
mysql> update mysql.user set authentication_string=password('123456') 
where host ='localhost' and user='root';
Query OK, 0 rows affected, 1 warning (0.00 sec)
Rows matched: 1 Changed: 0 Warnings: 1

mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)
mysql>

note:

MySQL 5.7 is an updated user table authentication_string field,

MySQL 5.6 is an updated user table password field,

After the change the user password using the command: Update MySQL. User  SET password = password ( ' 123456 ' ) WHERE Host = ' localhost '  and  User = ' the root ' ;

Update user rights:    flush privileges

The configuration back to restart mysqld

[root@localhost /]# vi /etc/my.cnf
[root@localhost /]# systemctl restart mysqld
[root@localhost /]# mysql -uroot -p123456

Information Reference:

https://www.cnblogs.com/zhongyehai/p/10695659.html

https://blog.csdn.net/bingcheng529/article/details/88557599

https://www.cnblogs.com/iosdev/archive/2013/07/15/3190431.html

mysql- Management Commands create user authorization, change your password, delete users and authorization, forget the root password]

Guess you like